Humble Homemade Hifi


Capacitor Test

The subjective results of this test are meant to give you a basic idea of the sonic differences between capacitors when used in loudspeaker filters. I test all the capacitors in the signal path of tweeter and midrange circuits in loudspeaker crossovers and try them out in both series- and parallel crossovers. The capacitors are tested in different loudspeakers, varying from the ones I happen to be building at the time to the many demo speakers I have. I also use solid-state and tube amplification, analogue and digital source equipment and several different interlinks and speaker-cables during the process of evaluation that takes several months of extensive listening. Testing is done by listening to various good quality recordings on CD and vinyl and everyday high Kbs streaming internet radio. The evaluation consists of listening with just one pair of capacitors (so no switching) over a longer period of time. This is then repeated with a different capacitor. This way I get a good idea of what each capacitor does and doesn't do. Finally I do direct comparsions with previously tested types to determine the rating. Over time I may re-evaluate my previous conclusions as new capacitors enter the contest. I give each participant a rating. This scale is based purely on sound quality; price has been left out of consideration. A higher rating does not automatically mean that one capacitor is better than another. A hi-Fi system is a very complex sum of many variables, a capacitor is only one part of that total, so depending on implementation things may vary a little. On the other hand you can be assured that capacitor A with a 6 point rating won't "beat" capacitor B with a 10 point rating.

Why do capacitors sound different?

In the past capacitors were just capacitors and sound quality was determined by the dialectric material with polypropylene considered by many as "the best" seeing as this type of capacitor had the lowest losses. But technology of the 21st century has brought us new measuring techniques and insights and there seems to be more to it. We can now measure things that were not possible a few years ago. In a nut-shell: microphony is the keyword - the mechanical resonance, a key feature of audio capacitors. This is a physical deformation of the capacitor walls which occurs as a result of the audio signal passing through the component – much like an electrostatic speaker. This resonance is dependent on the size, shape, materials and manufacturing parameters of the capacitors. This effect has been known about for years as it plays a part in the impulse strength of capacitors. However, the effect has never been considered to be significant enough to affect a hi-fi system’s audio reproduction due to the low energy involved. For more indepth information read the Clarity Cap white paper on mechanical resonances inside capacitors. Another interesting article was written by Martin Colloms back in 1985 in which he tested several capacitors on their sonic differences. Also look at the equivalent circuit diagram of a capacitor, this also explains a lot. A capacitor is more than just capacitance C!

So far I have tested the following capacitors (in alphabetical order):


Amp Ohm FP-CA-AU polypropylene

Amp Ohm PF-XAL-AL alu / paper in oil

Amp Ohm PF-XAL-W-AL alu / paper in wax

Amp Ohm FE-XAL-AL alu / polyster in oil

Ansar CPA polypropylene 450VDC

Arcotronics MKP-C-4G

ASC X386S MKP in oil

Audience Auricap MKP *

Audio Cap PPMF MKP

Audio Cap Theta PPT MKP-Sn

Axon True Cap

Cicada Pure Aluminium Foil 100VDC

Cicada Pure Copper Foil 100VDC

Clarity Cap PWA

Clarity Cap APW

Clarity Cap PX

Clarity Cap SA

Clarity Cap ESA

Clarity Cap MR *

Clarity Cap DTAC

Ducati 4.16.10 MKP

Duelund VSF Cu-foil / paper *

Duelund CAST Cu-foil / paper in oil *

Duelund RS Cu-foil / paper in wax *

Epcos B32523-Q3475-K26 MKT

Epcos B32656-A6475-J MKP

Epcos B32774-D1505-K MKP

Erse Pulse-X 630VDC

Erse Transient-X 1200VDC

Evox-Rifa PHE 426

Evox-Rifa PHE 450

Evox-Rifa SMR

Hovland MusiCap

Hovland SuperCap (Robert Hovland Series) *

Inco Sintex 45T D2BS

Intertechnik Audyn Cap FFC alu-foil PIO

Intertechnik Audyn Cap Kp Sn

Intertechnik Audyn Cap MKP-QS

Intertechnik Audyn Cap Plus

Intertechnik Audyn Cap Reference *

Intertechnik Audyn Cap True Silver

Intertechnik Audyn True Copper Cap *

Jantzen Audio Cross Cap 400VDC

Jantzen Audio Standard Z-Cap

Jantzen Audio Superior Z-Cap *

Jantzen Audio Silver Z-Cap

Jantzen Audio Silver Gold Z-Cap

JB Capacitors JFX 250VDC

JB Capacitors JFX 630VDC

JB Capacitors JSX 250VDC

JB Capacitors JSX 630VDC

Jupiter HT BeesWax Paper Cryo

Jupiter Flat Stacked Beeswax Cryo *

Le Clanché PPM MKP *

LCR FSC tubular foil polystyrene

Mundorf MCap 250VDC MKP

Mundorf MCap 400VDC MKP

Mundorf MCap 630VDC MKP *

Mundorf MCap RXF

Mundorf MCap EVO Aluminium 450VDC

Mundorf MCap EVO Aluminium/Oil *

Mundorf MCap EVO Silver/Gold/Oil

Mundorf MCap Supreme Cap *

Mundorf MCap Supreme Silver/Oil *

Mundorf MCap Supreme Silver/Gold

Mundorf MCap Supreme Silver/Gold/Oil *

North Creek Crescendo Film and Foil

Obbligato Aluminium Foil *

Obbligato Film Oil

Rike Audio S-Cap PIO Alu Foil 600VDC *

SCR Châteauroux MKP-PB

Solen Châteauroux Fast Cap PB-MKP-FC

Sonic Craft Sonicap

Super PP Capacitor

TRT Wonder DynamiCap

Vishay MKT 1822

Vishay MKP 1837 *

Vishay MKP 1839HQ 630VDC

Vishay Sprague 730P

Wima MKP4

Wima MKP10

Wima MKS4

* Personal favourites!

Amp Ohm FP-CA-AU 630VDC - 5% tolerance

Technical Specifications (according to manufacturer): "Amp Ohm Audio Capacitors are specially designed for high performance audio systems. The capacitors are hand wound and have their insulated copper leads hand soldered before being assembled in a plastic case and resin sealed. The resin filled end identifies the outer winding. This construction results in the capacitors having low ESR and low inductance and possessing high stability with respect to both temperature and frequency. They are ideal for use in loudspeaker crossover networks and valve amplifiers where pure sound is at a premium. Line on label denotes outer foil".

Sound: The Amp Ohm FP-CA-AU is a very neutral sounding capacitor that takes a nice smooth and calm approach to the reproduction of music. I found the balance of the midrange very pleasing letting acoustic instruments keep their natural warm tone. Absolute detail and air isn't quite up to the level of an Audyn Cap Plus or Mundorf Supreme but it comes very close although they do need some time to open up so don't judge them fresh out of the box. Spatiality is broad with reasonable depth but if you want "bowling alley" depth go for (the much more expensive) Mundorf Silver/Oil. Compared to the more luxurious Amp Ohm capacitors they are more 2D and a little rough, but again those cost far more.

Verdict: 8,5

Amp Ohm PF-XAL-AL 300VDC Paper in Oil aluminium foil - 10% tolerance

Technical Specifications (according to manufacturer): "Amp Ohm paper in oil (PIO) capacitors are hand wound using high aluminum foil. They are oil impregnated before being assembled and oil filled. The capacitors are then hermetically sealed in an aluminum housing with phenolic resin and rubber end discs. Each lead is hand solder sealed to the eyelets in the end discs. The leads are 1.0mm in diameter and made of tinned copper. All Amp Ohm Audio Capacitors are individually hand tested. Line on label denotes outer foil."

Sound: The Amp Ohm PF-XAL-AL 300VDC is very rich in harmonic textures and quite spatious. When fresh out of the box they can be a bit "chesty" or "nasal" sounding but they mellow out after quite some time of use (several hundred hours). Their tonal balance is very neutral and smooth, words like natural and analogue come to mind. Imaging depth is very good but not quite at the same level as their paper-in-wax or polyester-in-oil stable mates.

Verdict: 10,5

Amp Ohm PF-XAL-AL 630VDC Paper in Oil aluminium foil - 10% tolerance

Technical Specifications (according to manufacturer): "Amp Ohm paper in oil (PIO) capacitors are hand wound using high aluminum foil. They are oil impregnated before being assembled and oil filled. The capacitors are then hermetically sealed in an aluminum housing with phenolic resin and rubber end discs. Each lead is hand solder sealed to the eyelets in the end discs. The leads are 1.0mm in diameter and made of tinned copper. All Amp Ohm Audio Capacitors are individually hand tested. Line on label denotes outer foil."

Sound: The Amp Ohm PF-XAL-AL 630VDC is basically the same type as the above mentioned capacitor but with a higher voltage rating. The higher rating is obtained using thicker materials and therefore the 630VDC version (65mm) has a larger diameter than the 300VDC version (45mm). Both have the same length (95mm). The 630VDC version reminds me of a can of beer or coke. The higher VDC type is also very rich in harmonic textures and quite spatious. The tonal balance is very neutral and seems a fraction smoother than the lower VDC type. Imaging depth is very good but like the 300VDC version, not quite at the same level as their paper-in-wax or polyester-in-oil stable mates. My review notes also state: black background.

Verdict: 11-

Amp Ohm PF-XAL-W-AL 630VDC Paper in Wax aluminium foil - 10% tolerance

Technical Specifications (according to manufacturer): "Ampohm Audio Capacitors are specially designed for high performance audio systems, used in various applications. These paper in wax (PIW) capacitors are hand wound using high purity aluminium foil and have their 1.0mm diameter tinned copper leads hand solder sealed to the eyelets in the end discs. They are wax impregnated before being assembled and hermetically sealed in an aluminium housing with phenolic resin and rubber end discs, all being individually hand tested. Line on label denotes outer foil."

Sound: The Amp Ohm paper-in-wax alumnium foil type seems a fraction flatter or condensed sounding when in direct comparison to the Ampohm paper-in-oil alumnium foil type. It is a little more direct in it's presentation compared to paper-in-oil but more laid-back when compared to the polyester-in-oil types. I also noted less "fleshy" and a tad thinner than the Ampohm PIO. There also seems to be a fraction more emphasis on the frequency extremes giving it a miniscule loudness effect when compared to the very analogue midrange character of the polyester-in-wax type. This is not meant in a negative way seeing the overall high quality sound level of this capacitor, as it's character could prove usefull when fine-tuning a loudspeaker in a certain direction.

Verdict: 10

Amp Ohm FE-XAL-AL 630VDC Polyester in Oil aluminium foil - 10% tolerance

Technical Specifications (according to manufacturer): "Ampohm Audio Capacitors are specially designed for high performance audio systems. These polyester film capacitors are hand wound using high purity aluminium foil and have their leads hand soldered before being assembled and hermetically sealed in an aluminium housing with phenolic resin and rubber end discs.The 1.0mm diameter tinned copper lead out wires are solder sealed to the eyelets in the end discs This construction results in these components being ideally suited for use as coupling capacitors or as replacements for components in existing designs. Line on label denotes outer foil."

Sound: The Amp Ohm polyester-in-oil alumnium foil is overall very coherent and neutral. This type has a pleasent midrange-highlight when in direct comparison to the Ampohm paper-in-wax alumnium foil type. The polyester-in-oil is very rich and extremely good in retrieving ambient information such as room or hall acoustics. Music is presented in a natural and full-bodied manner. Compared to the Duelund VSF-Cu copper-foil the image is more "see through". Compared to the Mundorf Silver-Gold-Oil the presentation is richer, especially noticable on massed strings or large vocal works. On small jazz-trio's etc the Silver-Gold-Oil high-lights micro detail a little more but doesn't quite reach the same level of overall coherence the polyester-in-oil does so well.

Verdict: 11+

Ansar CPA polyproylene 450VDC - 5% tolerance (a.k.a. Ansar Supersound)

Technical specifications (according to manufacturer): "General purpose Audio grade component. Axial design. Ideal for all general audio usage, a wide range of voltages and values available. This range of components was designed mainly for the loudspeaker crossover manufacturers. The components are manufactured with the aim of producing a highly transparent component for use in critical signal paths such as the crossover network. They are an excellent all round product which have been designed to offer the best compromise between quality and cost. Highly regarded throughout the industry they are used by many of the UK's leading loudspeaker manufacturers."

Sound: The Ansar CPA has a vibrant, clean and clear nature that seems to be concentrated more on the top-end of the spectrum. Not completely neutral but therefore they can be usefull if you want to give a more open sound to a system that sounds a bit congested in the midrange and / or lower treble, in such a situation the Ansar CPA open's things up nicely. Used in a tonally neutral system they could do with a bit more presence and body, they tend to lean towards a slightly thin nature. This nature can make acoustic instruments like a grand piano or massed strings sound a bit distant. For example a Jantzen Audio Standard Z-Cap is more neutral and has more body weight but lacks the top-end "sparkle" the Ansar CPA produces. Nice thing though is that they never get harsh nor rough around the edges. Image depth is slightly flatter than higher grade capacitors but compared to other general purpose MKP's they perform very well. Top end detail is more prominant than the slightly rolled-off nature you find with a Clarity Cap SA. The Clarity Cap SA in return sounds more up-front in the lower treble range. They are nicely compact in size, so they can turn out handy when space is critical.

Verdict: 7,5

Arcotronics MKP-C4G 600VDC - 5% tolerance

Technical Specifications: Self-healing metallised polypropylene snubber capacitor intended for use in power semiconductor circuits to suppress or attenuate undesired voltage peaks e.g. electronic ballasts and motor applications.

Sound: The Arcotronics cap is a modest sounding capacitor, a little on the quiet side concerning dynamics. I quite like the midrange quality especially with percussion music. Drums, etc. had a nice natural timbre. There seems to be a focus on the midrange, the treble is slightly rolled off. Spatiality is a little compromised resulting in a slightly distant and compact image. Overall detail is slightly better than a standard Audyn Cap for example but doesn’t compete with an Amp Ohm or Mundorf Supreme. A good MKP for basic filter applications.

Verdict: 7

ASC X386S MKP in oil 600VDC – 10% tolerance

Technical Specifications: Industrial application capacitor. Although the tolerance stated is meant to be a poor +/- 10%, I measured all of them and they were all spot-on the stated capacitance. Now that is what I call built to industrial standards! I guess they state such a large tolerance because being designed for industrial applications they will be used in varying temperature conditions. The vegetable oil inside will therefore vary in fluency. But at normal room temperature they seem to be at their best. The values are different to the standard range but they come in values from 1,0 to 60uF although small quantities are hard to get unless you want to order more than a hundred of them. ASC also supplies these metallized polypropylene types to other notable High-End Audio companies, including Conrad-Johnson. ASC polypropylene and oil capacitors feature a sealed metal 'oil can' construction and hefty four-way solder/connector lugs on the bottom. The capacitor itself is made of metallized polypropylene film, similar in construction to standard MKP’s, but suspended in a bath of vegetable oil: some claim that this oil provides a damping effect in audio circuits. When you shake it you can hear the oil splash around!

Sound: They sound a bit dull at first because they take a while to burn-in. But after a few days of normal use they deliver a wide and open sound stage. Nice and neutral, maybe a slightly warm and lush sound. One of those things that don’t impress at first but sort of grow on you after a while, you learn to appreciate their qualities – great! If you want a lively and bright sounding filter then this is not your cap (try a Hovland Musicap instead), if you are looking for a smooth, warm and relaxed sound then give these a try.

Verdict: 7,8

Audience Auricap MKP 200VDC – 10% tolerance

Technical Specifications (according to manufacturer): "Auricap metalized Polypropylene capacitors are cylindrically wound with epoxy end fill and have very good volumetric efficiency. They are wound to exacting industry leading specifications to meet or exceed the requirements of MIL-C-55514A and MIL-STD-E method 103B. As with all metalized polypropylene film capacitors Auricaps are self healing. Failure mode is as an open circuit. Auricaps are made with the very best film available and are constructed to center value. Special care is taken to insure industry leading ESR values. Auricaps are designed to be a general purpose capacitor for use in all applications where size, value and temperature considerations are suitable. They are useful in signal coupling, filtering and power factor correction applications. The outside foil connection of Auricaps is identified with either a black lead (when leads are red and black) or a shorter lead when leads are solid core type. This identification is not a voltage polarity indication but is a consideration for minimum noise pick up.”

Sound: I find these capacitors to have a pleasently smooth and clear presentation that is slightly forward if directly compared to bright-ish capacitors like the Jantzen Silver Z-Cap or Silver Gold Z-Cap. The Auricap retrieve enough amibent information that helps to make an orchestra properly placed in a concert hall (recording permitting) and project the image more in the width than in the depth. Overall performance is very satisfactory and has something correct / complete about it. I have added them to my favourites list.

Verdict: 9

Audio Cap PPMF MKP 200VDC – 10% tolerance

Technical specifications (according to manufacturer): “The PPMF Audio Caps are metallized polypropylene, useful as upgrade from Mylar or inferior film caps, and available in values large enough to be ideal for speaker crossover networks. They are built of the best materials and exhibit excellent electrical and environmental characteristics. Their superior build quality and high capacitance values provide a high-quality stable, long-term performance not usually found in this price range. Thegold-plated OFHC leads provide long-term high reliability and excellent solder ability, superior to silver wire because of gold's non-oxidising properties.”

Sound: Slightly more detail, depth and separation than a standard Mundorf M-Cap but slightly less than a Hovland Musicap. The M-Cap has a more round character, the Audio Cap PPMF a more laid-back character. For the rest I find them reasonably neutral.

Verdict: 7

Audio Cap Theta PPT MKP-Sn 200VDC – 10% tolerance

Technical specifications (according to manufacturer): “The PPT Theta Audio Cap is an excellent film & foil capacitor for all audio circuits and power supplies. It provides low distortion performance and long-term reliability. It exhibits excellent electrical and environmental characteristics at a reasonable price. Its sonic signature is rich and full and its superior build quality ensures a high-quality stable, long-term performance not usually available in this price range. The gold-plated OFHC lead wires provide long-term high reliability and excellent solder ability, superior to silver wire owing to gold's non-oxidising properties.”

Sound: These caps have a lean, clinical brightness to them and at the same time lack transparency. A form of artificial clarity is created by means of a treble glare in the top end - at least they don't have a loudness effect. They work well in opening-up a dull, lifeless speaker but that's about it. Use them as a small value parallel to a large "dull sounding" cap only; they will clean up a cheap Intertechnik Audyn Cap nicely. But costing far more than an ERO MKP1837 I don't really see the point of buying them.

Verdict: 6,5

Axon True Cap 250VDC – 5% tolerance

Technical specifications: Low cost polypropylene capacitor very similar in physical appearance to SCR, Solen and Angela branded capacitors.

Sound: The Axon True Cap has a slight focus on the lower treble range giving it a fat and juicy character. They lack air and micro detailing, but what can you expect in this price range? They are not very subtle either but they never get harsh or over bright. Just your basic, standard quality MKP. It is rather like the Solen Chateauroux Fast cap but has a fraction more clarity so that is why it gets a higher rating. Nothing wrong with them but also nothing exciting. For example a WIMA MKP4 is more open, smoother and has better imaging.

Verdict: 6,5

Cicada Pure Aluminium Foil 100VDC - 3% tolerance

Technical specifications: Film and foil type MKP from Taiwan.

Sound: The Cicada Pure Aluminium Foil capacitor is similar in character to the Mundorf Supreme in that it has a slight top-end high-lighting except the Cicada lacks the fluidity and smoothness of the Mundorf. Compared to rich and harmonically natural capacitors like Jupiter BeesWax and the Obbligato Aluminium type, the Cicada Pure Aluminium Foil sounds a little rough and technical. After a very long burn-in time they did smooth a lot but they still maintained a sort of "hifi" sound. They are very accurate and good at retrieving detail. They put an emphasis on the leading edge of the note and have nice dynamic snap that can sound exciting on some recordings or types of music. But for me ultimately they could do with a bit more natural harmonic richness and fluidity to be able to shine in all situations.

Verdict: 9+

Cicada Pure Copper Foil 100VDC - 3% tolerance

Technical specifications: Film and foil type MKP from Taiwan.

Sound: The Cicada Pure Copper Foil capacitor is similar in character to the aluminium foil type except it is far more rich and fluid - bringing it closer to some other high-quality capacitors. Obviously it is the better of the two Cicada types. This richness and fluidity makes them more coherent and therefore the minor top-end emphasis is also less prominent making it easier for you to get into the music instead of listening to a good capacitor, if you know what I mean. The leading edge of the note and the nice dynamic snap are less detached, more in pace with the music.

Verdict: 10

Clarity Cap PWA MKP 160VDC - 5% tolerance

Technical specifications(according to manufacturer): “The PW range has long been established as an economical component producing improved sonic performance over many overseas brands. Over the years numerous companies have used this range as their entry-level products with great success. Available at ratings of 160Vdc, 250Vdc, 400Vdc and 630Vdc, it offers audio engineers the maximum flexibility when considering components for their circuits. Wound from 4µm, 6µm, 8µm and 10µm metallised film respectively, components can be selected using their slightly differing sonic performances and aspect ratios to give the optimum solution desired. Copper clad steel terminals are standard; however, others are available upon request Tape and resin colours are flexible with options shown in Custom products. Unless specified, capacitors would be supplied with white tape and red resin. ”

Sound: The Clarity Cap range has an overall similarity in tonal balance, going up the range you gain clarity and spatiality. I found the PW to be quite neutral with a slightly warmish presentation. Compared to the PX there is a loss of detail but they never sound dark. Compared to a standard Mundorf M-Cap the stereo-image is a little larger. The price/quality ratio is very good. I can recommend this capacitor if you have a tight budget and like a speaker to be as smooth as possible.

Verdict: 7

Clarity Cap APW MKP 160VDC – 5% tolerance

Technical specifications(according to manufacturer): “Available at ratings of 160Vdc, 250Vdc, 400Vdc and 630Vdc, it offers audio engineers the maximum flexibility when considering components for their circuits. Wound from 4µm, 6µm, 8µm and 10µm metallised film respectively, components can be selected using their slightly differing sonic performances and aspect ratios to give the optimum solution desired. Copper clad steel terminals are standard; however, others are available upon request Tape and resin colours are flexible with options shown in Custom products. Unless specified, capacitors would be supplied with white tape and red resin. ”

Sound: To be honest, I can't hear any difference between the Clarity Cap APW and PWA but that was to be expected, according to Clarity Cap they are the same. I found the APW also to be neutral with a slightly warmish presentation. Compared to the PX there is a loss of detail. The price/quality ratio is very good. I can recommend this capacitor if you are on a tight budget and are looking for a capacitor that doesn't stand-out too much.

Verdict: 7

Clarity Cap PX MKP 250VDC – 5% tolerance

Technical specifications (according to manufacturer): “The PX range was developed to address the performance gap between the PW and SA ranges. It is closer to the SA in terms of sonic performance but at a price very similar to the PW range. Since it was introduced, it has made significant inroads into the loudspeaker industry. Constructed from a 250Vdc(6µm) rated film, this component is spindle wound. It is then given a special heat treatment before it has insulated copper terminals hand soldered to give the best possible connection. The inherently low dissipation and dielectric absorption factors of polypropylene allied with excellent mechanical stability results in an extremely detailed sonic performance. The construction also results in a low self-inductance and ESR (Equivalent Series Resistance) and the devices are highly stable with regard to temperature and frequency. Tape and resin colours are flexible with options shown in Custom products. Unless specified, capacitors would be supplied with blue tape and blue resin.”

Sound: The Clarity Cap range has an overall similarity in tonal balance, going up the range you gain clarity and spatiality. I found the PX to be neutral with a slightly warmish presentation. Compared to a standard Mundorf M-Cap the stereo-image is a larger but less spacious than a Mundorf Supreme or Audyn Cap Plus. Clarity is a good step up from the PW and also the M-Cap. The price/quality ratio is very good. I can highly recommend this capacitor if you are looking for a nice, but not too expensive MKP.

Verdict: 7,5

Clarity Cap SA MKP 630VDC – 5% tolerance

Technical specifications (according to manufacturer): “The SA range, developed in conjunction with a renowned loudspeaker manufacturer, remains one of the most highly regarded axial components currently used in the audio market. Time and time again the component is specified as a benchmark for other manufacturers components to try to aspire to. Sales continue to grow year on year as new customers, in new markets appreciate its worth. Specially developed to meet the needs of the professional audio engineer in both hi-Fi and studio monitoring, these components are the result of extensive consultation between the audio industry and Clarity Cap. The capacitors are hand wound using a 10µm (630Vdc) rated polypropylene film. Following a special heat treatment cycle insulated copper terminals are hand-soldered to give the best possible connection. The inherently low dissipation and dielectric absorption factors of polypropylene allied with excellent mechanical stability results in an extremely detailed sonic performance. The construction also results in a low self-inductance and ESR and the devices are highly stable with regard to temperature and frequency.”

Sound: The Clarity Cap range has an overall similarity in tonal balance, going up the range you gain a bit in clarity and spatiality. I find the SA to be neutral with a slightly warmish presentation but also a bit closed-in. Compared to the Clarity Cap PX definition and separation are better, the stereo-image is also little larger. I did find the top end to be slightly rolled-off, not that they lacked detailed but on some recordings I wanted a fraction more transparency - but all in all still very nice. On the downside the "S" and "T" in vocals can be a bit plasticy, this is probably due to the lack in transparany in the top octave, making the octaves below sound a little masked. Making a capacitor using about 90% Clarity Cap SA and about 10% Mundorf Supreme works very well, this tends to open up the top end just nicely without altering anything else.

Verdict: 8

Clarity Cap ESA MKP 630VDC – 5% tolerance

Technical specifications (according to manufacturer): “The ESA range of components exploits the knowledge gained during the extensive research programme recently undertaken by Clarity Cap. The research programme looked into ways of reducing mechanical resonances inherent in a wound capacitor to hitherto unachievable levels. ESA capacitors are designed to offer a mid way house between the highly regarded SA range and the new no compromise MR range. Manufactured from polypropylene film the component is supplied in the familiar wrap and end seal style, wrapped in a polyester tape and encapsulated in an epoxy resin.”

Sound: Similar in overall character to the Clarity Cap SA but with more clarity and therefore a fraction more spatial. Like the SA they could still do with a bit more transparency but with a small capacitor placed parallel to the ESA this can be improved. The ESA also has a slightly warmish presentation and also benefits from making a total value using about 90% Clarity Cap ESA and about 10% Mundorf Supreme. This opens up the top end just nicely without altering anything else. Good overall qualities and an upgrade from the standard Clarity Cap SA.

Verdict: 8,5

Clarity Cap MR MKP 630VDC – 3% tolerance

Technical specifications (according to manufacturer): “The MR range of capacitors is the result of an extensive ground breaking two year research programme into audio grade capacitors. The resulting capacitor is, we believe, at the leading edge of today's high quality audio grade capacitors. The component is manufactured in such a way to substantially reduce the negative effects of resonance on sonic quality which is inherent in a wound component. This results in a sonic characteristic which is difficult to equal. Manufactured from metallised polypropylene film the component is housed in a coloured acrylic tube and encapsulated in an epoxy resin to assist in the overall sonic performance. ”

Sound: Like the Clarity Cap DTAC, the Clarity Cap MR doesn't have that dark character of the standard Clarity Caps and sounds in comparison very spatial and clear. Spatiality is one of the main strengths of this capacitor supported by very good separation of the individual instruments and vocals. The music is placed before a very quiet background with lots of detail making retrieval of ambient information like the natural reverberation of a concert hall easily distinguishable. Compared to a Mundorf Silver-Gold-Oil they are ultimately a little less transparent, presenting the information more up-front with a slight focus on the lower treble range. In comparsion the Mundorf SGO has a slight focus on the upper treble range.

Verdict: 11+

Clarity Cap DTAC MKP 630VDC – 5% tolerance

Technical specifications (according to manufacturer): “A narrow 10um (630Vdc) polypropylene film with a special spray and heat treatment contribute to the exceptional performance of this capacitor. These measures combined with hand soldered M8 male or female terminations ensure that the ESR is greatly improved when compared to the traditional axial leaded components. It has been designed to produce the lowest possible resistance within the component, which Clarity Cap believe has a direct relationship to sonic performance. The low ESR is particularly relevant in high quality crossover networks, ensuring that loudspeakers perform to their optimum. Tape and resin colours are flexible and unless specified, capacitors would be supplied with gold tape and black resin.”

Sound: The Clarity Cap range has an overall similarity in tonal balance except for the DTAC. It doesn't have the rounded character of the other Clarity Caps and sounds in comparison much cleaner. I may be exaggerating a little here, but the DTAC makes a Clarity Cap SA sound a bit cheap. Compared to a Mundorf Silver/Gold they still seem a fraction rounder and they are as transparent and clear as a Jantzen Audio Silver Z-Cap without being over bright. If you were looking for lots of depth, ambient information and concert-hall reverberation then I would advise to look at the Mundorf Silver/Gold, but if you prefer a slightly smoother top-end then the Clarity Cap DTAC is an interesting alternative.

Verdict: 10

Ducati 4.16.10 400VAC - 5% tolerance

Technical specifications (according to manufacturer): “The dielectric is polypropylene film, the electrodes consist of an extremely thin metal coating obtained by vacuum evaporation. Case and cover are made with self-extinguishing plastic material; the capacitive element is sealed with polyurethane resin. The main characteristics of these capacitors are: Low losses non-inductive winding; Self-healing property avoiding short circuits; Small size and limited weight; No leakage risk; Capacitance tolerance: ± 5%; Working frequency range: 50 ÷ 60 Hz; Individual test voltage: Between terminals: 2.15 Vn for 2 sec.; between terminals and case: 3KV for 2 sec; Dissipation factor tan δ: <20 10–4@ 20°C V=Vn, 50Hz; Protection Case and cover in self – extinguishing plastic material; Terminals: twin cable, unipolar leads; Protection degree: with terminals: IP00; with twin cable IP55; Threaded fixing bolt M8”

Sound: This industrial type capacitor (like the ASC and Inco) is quite nice! They sound a bit dull at first because they take a while to burn-in. But after a few days of normal use they deliver a reasonably wide and open sound stage. Nice and neutral, maybe a slightly warm sound. One of those things that don’t impress at first but sort of grow on you after a while, you learn to appreciate their qualities – great! Not the ultimate in sound staging or micro-detail and if you want a lively and bright sounding filter then this is not your cap. But if you are looking for a smooth, warm and relaxed sound then give these a try.

Verdict: 7,5

Duelund VSF-Cu Copper Capacitor 100VDC - 2% tolerance

Technical specifications (according to manufacturer): "The Virtual stack foil capacitor, a capacitor made specially for loudspeaker crossovers. This new capacitor is the realisation of a lifelong ambition. It consists of copper foil and high-density paper, soaked in pure mineral wax, coated with pure cocoon silk and finally, treated with special lacquers made from natural materials. It is without question a "green" product. The actual construction has been overseen by Mr. Steen Duelund Chief Engineer of Duelund Coherent Audio. Mr. Duelund has dictated the capacitor's special characteristics, i.e. its flatness, giving the opportunity to create its stack-foil working manner ensuring very low inductance, forming a solid block resulting in a form free of internal resonance. Furthermore, the flatness makes it easier to achieve greater values by connecting the capacitors in parallel".

Sound: I found the Duelund VSF-Cu to have a very natural timbre, smooth, clear, open, and at the same time they stay calm and controlled but delivering dynamics when the music calls for it. The tonal balance is near perfection, especially audible on well recorded acoustic instruments and the human voice. This makes my classical music collection so much more realistic. Also I was very pleased with the separation of every individual instrument in an orchestra, the string section is much more a group of individuals rather than just a group. In direct comparison to the Duelund I found the Mundorf Silver/Gold to be a little over-etched sometimes, they seem to have a slight top-end emphasis. The Duelund VSF-Cu in return has a slight top-end roll-off. Which would be best for you would depend on the rest of your system and personal taste.

Verdict: 12,5

Duelund CAST-Cu Copper / Paper-in-Oil Capacitor 100VDC - 2% tolerance

Technical specifications (according to manufacturer): "The Duelund CAST Capacitor is a no holds barred flagship capacitor. The construction builds on the foundation of the Virtual Stack Foil design but does so with the addition of a proprietary WPIO dielectricum which necessitates several days of impregnation under very high pressure. This creates a form with incredible damping properties giving a mechanical stability hitherto unheard of. On top of this casting process, a ring of hard pressed paper strengthens the damping properties of the design helping music flow effortlessly. The Duelund CAST capacitor is available for speaker use and as the CAST 630v for DC-applications".

Sound: The CAST capacitor has all the same characteristics as the VSF but with added top-end clarity and together with that, more spatiality. They are (like the VSF) super natural, smooth, clear and open. The tonal balance is extremely neutral, especially audible with good recordings of acoustic instruments and the human voice, so mainly with classical music. Like the VSF the separation of the individual instruments is very good and in an orchestra, the string section is a group of individuals rather than just a group. Soprano's have clarity without becoming hard to the ear, wind instruments (especailly the copper section) have that nice "metal" edge without becoming rough. Where in the past you had to choose between a Mundorf Silver/Gold/Oil (very good depth, imaging and top-end detail) or a Duelund VSF (extremely neutral presentation) you can now have the best of both worlds in the form of the Duelund CAST-Cu. I did find they needed quite a while to fully come to bloom, so give them a chance to burn-in.

Verdict: 14

Duelund RS Copper Loudspeaker Capacitor 100VDC - typical tolerance 2%

Technical specifications (according to manufacturer): "The all new RS series from Duelund is a further improvement on the VSF line of capacitors. After many years of research and development Duelund decided to improve upon the original VSF by applying the elaborate manufacturing process used in making the CAST version. Using high purity copper foil with a wax impregnated dielectric and treating it with the anti-resonance CAST material the RS series was born. These capacitors approach the CAST performance in a number of ways, but at a lower cost. The outer lead out, closest to the edge of the capacitor, is connected to the outer foil and as such should be connected to the lowest impedance path to ground".

Sound: After many hours of burn-in time the main thing that I kept writing about in my notes was how natural the Duelund RS-Cu sounds. This is one of the few capacitors with which I didn't have the urge to do some fine-tuning or mixing with other types / brands to reach an optimum result. In all the loudspeaker crossovers I tested them in, they just sounded so logical everytime. It didn't seem to matter if the tweater had a textile, magnesium, ceramic or beryllium dome - the Duelund RS just portrayed the sonic signature of the tweeter as it was. Nothing added, nothing hidden, no need to tweak, a real no brainer. Comparing the Duelund RS to the Rike Audio S-Cap I found the RS to give a richer tonal balance, like most copper versus aluminium caps do. The Rike Audio S-Cap seemed more up-front and a little more forward in the lower treble. In direct comparison the Duelund RS had more depth and was a fraction more forgiving to the ear. Not that the S-Cap is rough, not at all, but the RS just seemed to "flow" a little more. Focussing on the highest frequencies, again the Duelund RS seemed to sound the most natural. Various high-grade Mundorf capacitors that I compared the RS to all seemed to high-light that area a bit. This can be usefull or pleasent in some cases, but for me, they were not strictly neutral. Compared to the Duelund VCF-Cu the top-end has improved. Although a very nice capacitor, I always found the VSF-Cu to have a slightly rolled-off top-end. The Duelund RS, like the CAST-Cu, has more top-end clarity and together with that, more spatiality. Are we then looking at a CAST-Cu in disguise? No, the CAST-Cu still is the no-compromise capacitor with a blacker back-ground, making it more silent than the RS. Also the RS-Cu doesn't quite have the same image depth as the CAST-Cu. But like I stated earlier, the Duelund RS Copper Capacitor is a real no brainer, once you have put this capacitor in your loudspeaker crossovers you will never need to tweak again! Everything just sounds so logical.

Verdict: 13

Epcos B32523-Q3475-K26 MKT 250VDC - 10% tolerance

Technical specifications (according to manufacturer): "Metallized polyester film capacitors (MKT) B32520 ... B32529 General purpose (stacked/wound). Typical applications: blocking, coupling, decoupling, bypassing RFI for automotive; Max. operating temperature: 125°C; Dielectric: polyethylene terephthalate (polyester, PET); Stacked-film technology for lead spacing 5 to 15 mm = code C, D or E in digit 7 of ordering code; Wound capacitor technology for lead spacing 10 to 27.5 mm = code N, Q or R in digit 7 of ordering code; Plastic case (UL 94 V-0); Epoxy resin sealing (UL 94 V-0); Features: High pulse strength, High contact reliability; Terminals: parallel wire leads, lead-free tinned, special lead lengths available on request."

Sound: Suprisingly good sounding polyester type. For tonal balance I actually prefer them to the Epcos B32656 MKP type. Not quite as coherent as the Vishay MKT1822 but still pleasent. I can imagine them to work well in woofer impedance correction networks, where as the Vishay MKT1822 actually works well in the direct signal path.

Verdict: 6

Epcos B32656-A6475-J MKP 750VDC - 5% tolerance

Technical specifications (according to manufacturer): "Metallized polypropylene film capacitors (MKP) B32651 ... B32656 High pulse (wound). Typical applications: electronic ballasts, switch-mode power supplies; Max. operating temperature: 110°C: Dielectric: polypropylene (PP); Wound capacitor technology with internal series connection for VR ³1250 V DC; Plastic case (UL 94 V-0); Epoxy resin sealing; High pulse strength, high contact reliability; Terminals: parallel wire leads, lead-free tinned; Special lead lengths available on request."

Sound: Sounds kind of "plastic" with a rather 2D, flat image. Midrange is snappy and there is some pleasent treble bite that brings them just above basic quality polypropylene types. Fine for parallel sections in woofer and midrange sections of a loudspeaker crossover, but personally I would not use them in the direct signal path of a tweeter.

Verdict: 7

Epcos B32774-D1505-K MKP 1300VDC - 10% tolerance

Technical specifications (according to manufacturer): "Metallized polypropylene film capacitors (MKP) B32774 ... B32778 MKP DC link; High density series; Typical applications for compact design of: Frequency converters, Industrial and high-end power supplies, Solar inverters; Max. operating temperature: 105°C (case); Dielectric: polypropylene (MKP); Plastic case (UL 94 V-0); Epoxy resin sealing (UL 94 V-0); Capacitance values up to 110uF; Excellent self-healing properties; Overvoltage capability; Low losses with high current capability; High reliability; Long useful life; Terminals: parallel wire leads, lead-free tinned."

Sound: Similar in looks and sound to the Evox-Rifa PHE 426. Snappy and dynamic but rather up-front and forward in the midrange. The top-end treble has a slight glaze over it (not quite as strong as the Evox-Rifa) and therefore lacks a bit of sparkle and transparancy. Less of a "plastic" taste to it than the Epcos B32656-A6475-J. Fine for parallel sections in woofer and midrange sections of a loudspeaker crossover, but personally I would not use them in the direct signal path of a tweeter.

Verdict: 7+

Erse Pulse-X MKP 630VDC - 5% tolerance

Specifications (according to manufacturer): "ERSE’s Pulse X caps are a premium audiophile grade capacitor designed for quick transient response and ultimate musical performance. Every attention to detail was put into the PulseX capacitor line to insure premium performance. A premium grade of “defect free” aluminum metallized polypropylene film was chosen from an industry leading film supplier. Specially designed German winding machines with tension feedback control allow for precision repeatability during manufacturing. This industry first technique allows us to virtually eliminate mircrophonics and obtain a tight ± 3% tolerance, with virtually no scrap. All leads are lead free (RoHS Compliant), oxygen free 99.99% pure copper. Each lead is attached to the body of the capacitor with ultrasonic welding. To further reduce equivalent series resistance and improve long term reliability, the leads are then soldered with lead free silver solder. PulseX caps are then wrapped in flame proof polyester tape and the ends are epoxy filled. Before final packing, each PulseX cap is tested with certified premium quality Wayne Kerr capacitance bridges to insure a ±3% tolerance centered on the nominal value. The PulseX caps display signs of a near perfect capacitor. Total harmonic and IMD distortion and phase distortion are virtually immeasurable, while all losses are near zero in every aspect. PulseX caps will allow your music to be accurate and uncolored in every way."

Sound: Compared to the Transient-X from the same brand, the Pulse-X sounds rather dull and 2D. The treble is produced in a slightly "mushy" manor. This is fine when used in parallel sections and as a less critical midrange series capacitor but if you are looking for something in the tweeter's direct signal path, go for the Transient-X that is far more open, dynamic and has less background noise. Things like massed baroque choir become a mess, the Erse Pulse-X doesn't seem to keep a clear overview when the programme material gets complex. But the Transient-X is in another price-range, so not a fiar comparison. The Pulse-X basically is in the same league as capacitors like the Axon True Cap, Intertechnik Audyn Cap QS, Jantzen Audio Cross Cap, SCR Châteauroux MKP-PB, Solen Fast Cap PB-MKP-FC, etc. It's a fine overall standard quality capacitor for use when your budget is very tight.

Verdict: 6,5

Erse Transient-X MKP 1200VDC - 3% tolerance

Specifications (according to manufacturer):

Sound: The Erse Transient-X has lots of "in your face" detail without getting aggresive, it does a good balancing act in hearing enough detail but not too much. These capacitors are very usefull if you need to add some clarity to your system. They seem to do well in improving stick definition on the ride cymbal of a drum-set, like going from a hickory 5A to a 7A stick size. They also bring out the leading edge of a guitar nicely. The character of the Erse Transient-X is less well suited for classical music, it lacks some harmonic coherence at the top end, most noticable on un-processed acoustic music. So summing things up: they are very good in clearing up a dull system but only if you don't listen to classical music ;-)

Verdict: 9,5

Evox-Rifa PHE 426 MKP 250VDC – 5% tolerance

Technical specifications: “Single metallized polypropylene film pulse capacitor. Pulse operation in SMPS, TV, monitor, electrical ballast and other high frequency applications demanding stable operation. Polypropylene film capacitor with vacuum evaporated aluminium electrodes. Radial leads of tinned wire are electrically welded to the contact metal layer on the ends of the capacitor winding. Encapsulation in self-extinguishing material meeting the requirements of UL 94V-0. Two different winding constructions are used, depending on voltage and lead spacing”.

Sound: Similar to the Evox-Rifa PHE 450, the PHE 426 is transparent and clear sounding but less grainy. The treble still has a slight glaze over it, but it can be removed by putting a 0,01uF Vishay MKP1837 parallel to it. Imaging is quite good with a nice sized sound stage but only average separation. Dynamics are nice and snappy and the treble is well detailed. Similar in character to the Obbligato aluminium dry type, only it misses the analogue feeling to it. Compared to a Mundorf RXF it is a little brighter. This capacitor has a high price/quality ratio and matching it with other capacitors to create a custom capacitor gives very good results.

Verdict: 7+

Evox-Rifa PHE 450 MKP 250VDC – 5% tolerance

Technical specifications: Double metallized polypropylene film pulse capacitor intended for high frequency, high current stress applications. Typical Application: Protection circuit in SMPS and Electronic Ballasts. Encapsulated in self-extinguishing material meeting the requirements of UL94V-0. Only available in values up to 4,7uF.

Sound: The Evox-Rifa PHE 450 is a very transparent and clear sounding capacitor, some times a little too “fresh” sounding but this character can be compensated by adding a capacitor with a more round character – I had very good results with about 10% of the total value made up from Angela (Jensen) paper in oil. On its own I find the midrange a little under exposed and the treble has a slight glaze over it, which again can be removed by putting a 0,01uF Vishay MKP1837 parallel to it. Imaging is quite good with a nice sized sound stage but only average separation. Dynamics are nice and snappy and the treble is well detailed. It might seem that I am not too keen on the PHE 450 but this is just a way of trying to describe its character in words – I still find it a very nice little capacitor considering the price. This capacitor has a high price/quality ratio and matching it with other capacitors to create a custom capacitor gives very good results.

Verdict: 7

Evox-Rifa SMR 63VDC – 10% tolerance

Technical specifications: “ Metallized polyphenylene sulphide. Construction: polyphenylene sulphide film capacitor with vacuum-evaporated aluminium electrodes. Radial leads of tinned wire are electrically welded to the contact metal layer on the ends of the capacitor winding. Encapsulation in self-extinguishing material meeting the requirements of UL 94V-0. Typical applications: automotive and other applications with high ambient temperatures; applications requiring high stability and low losses; offers excellent sound quality in audio applications.”

Sound: Very compact little capacitor that sounds slightly on the bright side of neutrality. It is clearer than a Clarity Cap APW or PWA for example and has a reasonably wide image but lacks depth. So the sound stage is good in left to right positioning but poor in front to back placement, rather 2D. Its sonic character is quite close to that of the polyester Vishay MKT1822. The nice compact build designed for use on PC's can be the reason why one may prefer it above other low priced brands.

Verdict: 6

Hovland Musicap MKP 100VDC – 2,5% tolerance

Technical specifications (according to manufacturer): “Separate layers of polypropylene film & conductive foil; Large flexible 16 gauge, stranded, silver-plated copper leads; Lead-free silver-bearing solder used in tinning and attachment of leads; Manufactured in U.S.A. Hand soldered lead termination; Extremely low DA, DF and ESR; 100% pre-testing for quality assurance; Consistent, even, winding tension. ” They are slightly squiggly, when you squeeze them their capacitance changes!

Sound: Musicaps deliver fine dynamics, speed, focus, correct timbre and depth of field, and good inter-transient silence” – I can’t agree more on this! But I must say I have a love/hate relationship with them: they don’t mate with all types of tweeters. If in series with a very nice soft-dome tweeter they seem to bring out more detail than usual from such a tweeter compared to when used with other caps. I had good results with Scan speak soft domes and for the Dynaudio D260 Esotec I couldn't imagine a better cap in this price range. But if the tweeter tends to be a tad on the bright or clinic side they sound awful. Of course you do get more detail and a better sound-stage compared to if you used an Audyn Cap or Le Clanché but for example I tried them with the Focal tweeter in the Auriga and this didn't work at all! It hurt my ears! Here's a good tip: When tweaking a combo with a Scan speak D2905-9700 I found the best to be a 50/50% combination of the Hovland Musicap with a Mundorf Supreme Cap.

Verdict: 8

Hovland SuperCap (Robert Hovland Series) MKP 200VDC – 5% tolerance

Technical specifications (according to manufacturer): "Film & Foil polypropylene capacitor precision-made in the USA. The leads are 22 gauge fine strand silver-plated copper with PTFE (Teflon®) insulation. Capacitor orientation in the circuit: the outside foil is indicated by a tall vertical bar printed on the capacitor. Normally, the outside foil lead should connect to the "destination" of the signal going through the capacitor, the remaining inside foil lead should connect to the source".

Sound: Quite detailed without getting edgy or aggressive. High in contrast with a slight emphasis on the top end but always smooth souding. More lush and warm than, for example, a Jantzen Audio Silver Z-Cap. On occasions I could hear a slight "loudness" character in the treble range but nothing to worry about. The overall clean and intimate character combined with good image depth lets you pick out things in the background that would otherwise (with standard quality MKP's) get lost in the total mass of musical information. This character also lets you judge the sound quality of the programme material well, they are honest. A quality I rather like.

Verdict: 11

Inco Sintex 45T D2BS MKP 425VAC – 5% tolerance

Technical specifications (according to manufacturer): “Metallized Polypropylene Film Capacitors to be used with Alternate Current. The most specific use of these capacitors concerns the starting and running of single-phase and three-phase motors when the latter are to be connected to any single-phase power supply mains.” “Self-healing metallised polypropylene capacitors for motor run applications. Stud mount M8, flexible wire ended, plastic case.”

Sound: This industrial type capacitor (like the ASC)is quite nice! They sound a bit dull at first because they take a while to burn-in. But after a few days of normal use they deliver a reasonably wide and open sound stage. Nice and neutral, maybe a slightly warm sound. One of those things that don't impress at first but sort of grow on you after a while, you learn to appreciate their qualities – great! Not the ultimate in sound staging or micro-detail and if you want a lively and bright sounding filter then this is not your cap. But if you are looking for a smooth, warm and relaxed sound then give these a try.

Verdict: 7,5

Intertechnik Audyn Cap Fine First FFC alu-foil / paper in oil 400VDC – 20% tolerance

Specifications according to manufacturer: "Signal capacitor with mineral oil impregnation; anode: aluminum; capacitance range from 0,01 uF to 4,7 uF; voltage rating: 400VDC; connection lead length: min. 50mm; Loss factor tan: less than 0,002 at 1 KHz; construction: paper / aluminum / oil. High-quality capacitor for active audio and excellent for tube amplifiers".

Sound: I find the Intertechnik Audyn Fine First Cap to be smooth and calm in it's approach to music. It will play loud and always stay civilized. The texture of acoustics instruments is quite natural, big-band's sound lush and rich but sometimes I miss that nice rough edge and sense of power you get with massed brass going full steam. Large symphony orchestra's are well spaced out around a realistic and not over-sized sound field. The FFC is not as spatious, nor does it have as much depth as the higher grade Mundorf capacitors but what it projects is still very convincing. The Fine First Cap scores lots of points for solo piano music giving a very believable presentation of the instrument in size and texture.

Verdict: 9,5

Intertechnik Audyn Cap KP SN 160VDC – 2% tolerance

Specifications according to manufacturer: "Tin foil capacitor; connection leads: tinned copper; capacitance range from 0,10uF to 4,7uF; nominal voltage: 160VDC / 250VDC / 630VDC; C-Tolerance: ± 2%".

Sound: The Intertechnik Audyn Cap KP SN has a slightly flat image when compared with higher grade capacitors but does perform better than basic quality MKP's with a tad more detail. On loud passages things can a bit compressed, but again that is only when comparing them with capacitors of many times the price. So basically the Intertechnik Audyn Cap KP SN seems to fill the sonic gap between standard MKP's and high-grade types quite nicely. A good step up from it's cheaper brother the Audyn Cap MKP-QS.

Verdict: 8+

Intertechnik Audyn Cap MKP-QS 400VDC – 5% tolerance

Technical specifications: The Intertechnik MKP QS series of capacitors are recommended for use in medium quality loudspeaker crossovers. Two voltage ratings are available, 400VDC/250VAC and 630 VDC/400 VAC.

Sound: The Audyn Cap is a good step–up from cheap electrolytic capacitors often found in standard quality factory built speakers. Nothing wrong with them but also nothing exciting. Compared with electrolytics they have much more detail, smoothness and a wider stereo image. Compared to an Audyn Cap Plus they sound dull, mushy and closed-in. Your basic good old MKP for all simple filter applications, especially when not in the signal path. A good substitute for bi-polar electrolytics.

Verdict: 6,5

Intertechnik Audyn Cap Plus MKP 800VDC – 2% tolerance

Specifications according to manufacturer: "These low loss capacitors have been developed for extreme impulse/power handling. An important design/constructional feature is the power handling of the connection between the foils (electrodes) and the end. The Audyn Cap Plus has a vastly improved system of connecting the electrodes to the end leads. Audyn Cap Plus also utilises an internal series connection system whereby layers of metal foil are combined with a one-side metallized "blind" layer. As a result of the double metallization performance is greatly enhanced. Dielectric: polypropylene winding: induction free: 2 windings series connected Layers: Vacuum metallized body: aluminium, synthetic material (plastic)".

Sound: The Audyn Cap Plus is a nice capacitor! They sound a bit hard and up-front at first and have a sort of midrange haze because they take quite a while to burn-in. But after a few days of normal use they deliver a very spatial sound with lots of depth that only gets better as time passes. Good reproduction of musical nuances. Clarity, depth, detail and openness are there. When I first switched over to these I thought, “this is it!” even though they were fresh from the shelf (but that was a few years ago). They sound a little more mid-range forward compared to the equally good Mundorf Supreme Cap.

Verdict: 9

Intertechnik Audyn Cap Tri-Reference MKP 600VDC – 2% tolerance

Specifications according to manufacturer: "Very high long term stability; mechanically stabilized; vibration free casting; induction free winding technique; metallized film; self-healing design; due to the special contact surfaces and massive copper plates, the end plates are completely contacted. In conventional capacitors the contact is made only via two solder points; improved conductivity; larger surface by Tritec multi-stranded wire; stable housing; reduced loss factor compared to conventional MKP's".

Sound: The Audyn Cap Reference is a very nice capacitor! After plenty of burn-in time they produce very good lower treble articulation. In direct comparison to an Erse Transient-X of Mundorf Supreme Silver Gold they are not as direct, but personally I like that. They make a Jantzen Audio Superior Z-Cap seem a little nervous. The Intertechnik Audyn Cap Tri-Reference is very coherent, maybe not as "round" as a Clarity Cap MR or Jupiter Condensers BeesWax, but a little clearer with a blacker background. I find the Tri-Reference to be spatious and have good seperation of the individual instruments with a realistic amount of fine detail. They let you hear deep into the recording without ever exaggerating any part of the spectrum. There seems to be a nice "one-ness" feel about their overall character.

Verdict: 11+

Intertechnik Audyn True Copper Cap MKP 630VDC – 2% tolerance

Specifications according to manufacturer: "High-quality polypropylene capacitor for audiophile applications. Electrode: copper foil; Tritec end leads; induction free winding technique; self-healing design; encapsulation: epoxy resin; connections: 7x0,50mm Tritec wires; capacitance values from 0,10 uF to 2,20 uF; nominal voltage: 630 VDC; C-tolerance: ± 2%; temperature range: -25C to +70C; insulation resistance 30000/CMohm; uF) IEC60384-1, EN130000; Tang: less than 0,0002 at 1 kHz 25C".

Sound: The Audyn True Copper Cap is quite spatial with lots of air around the individual instruments. Very nice and coherent sounding with rich natural harmonics, all in all rather musical. Woodwind instruments come across with natural ease and brass instruments sound bright and warm at the same time - very convincing. The Audyn True Copper Cap has a perfect balance between warmth and detail. The amount of detail and spatial information lets you hear the acoustics of the recording venue well, placing an orchestra correctly about the stage (recording quality permitting of course). Very nice indeed and one of my personal favourites!

Verdict: 12

Intertechnik Audyn Cap True Silver 1000VDC – 2% tolerance

Specifications according to manufacturer: "Silver metallized polypropylene capacitor; pure silver wire circuit; induction free winding technique; bifilar winding technique; sturdy plastic housing protects against external damage; self-healing design; housing: plastic tube epoxy encapsulated; connections: solid core silver wires; capacitance range from 0,10uF to 15uF; nominal voltage: 1000VDC; C-tolerance: ± 2%; temperature range: -25C to +70C Tang: less than 0,0002 at 1kHz".

Sound: The Intertechnik Audyn Cap True Silver can be a bit "toppy" sometimes, it depends a bit on the system you use it in and the programme material you feed it. The Audyn Cap True Silver reminds me of the Jantzen Audio Silver Z-Cap in character although I do find the Audyn Cap True Silver to be the more neutral of the two. There is heaps of detail and lots of transparancy, all well in balance with it's other qualities, but it does need some attention when implementing it as an upgrade in an existing system. If you will be using this capacitor as the bases for a new crossover-design in which you can create good synergy with the rest of the system, then you will be rewarded with music that sounds rich detail, well balanced and never over-etched. It lets you look deep into recordings like Consort Music by William Lawes for example with all it's complex textural interaction.

Verdict: 11-

Jantzen Audio Cross Cap MKP 400VDC - 5% tolerance

Technical specifications (accoording to manufacturer): "Capacitors are wound from metallized (ZnAl) polypropylene foil; fronts are sprinkled with Zn powder, which guarantees firm contact to terminal leads and are further flooded with epoxy resin; the body of the capacitor is firmed by self-adhesive tape; terminal leads are made from round tinned copper wire; capacitor parameters are related to standard IEC 384-16; voltage rating: 400V DC; tolerance on capacitance: 5%; climatic category: 40/85/21; Cross Cap capacitors have the best possible electrical and sonic performance made from one of the best foils in the world, produced by the Tervakoski Company, Finland. Cross Caps do not make any unpleasant distortion on sound and do not colour the sound and its quality is long lasting. We are happy to have this very fine capacitor produced at a reasonable price level."

Sound: Like many basic quality MKP's they lack clarity and sophistication but their overall tonal balance is reasonably neutral. The lack of fine detail at the top end can make them sound a bit forward in some applications. Due to their very low cost they are ideal for parallel capacitors in the low-pass of a woofer for example where in low budget systems electrolytics are often found. Also fine in basic quailty parallel correction networks. They are also quite compact in size, so they can turn out handy when space is critical.

Verdict: 7-

Jantzen Audio Standard Z-Cap MKP 400VDC - 5% tolerance

Technical specifications: metallized polypropylene film, “special winding techniques”. Loss ang. Tan = 0.0002 for 1kHz / 1uF

Sound: Like the Intertechnik Audyn Cap QS they lack clarity and sophistication. Even after extensive burn-in they still stay rather closed-in. But at least they don’t have that “mushy” sound the Audyn Cap QS has and their tonal balance is reasonably neutral. They do emphasise “S” and “T” sounds a little, so don’t use them in the signal path! Due to their low cost they are ideal for parallel capacitors in the low-pass of a woofer for example where in low budget systems electrolytics are often found. They are nicely compact in size, so they can turn out handy when space is critical.

Verdict: 6,5

Jantzen Audio Superior Z-Cap MKP 800VDC - 2% tolerance

Technical specifications: metallized polypropylene film, high-grade copper lead wire. The finish is a flame-retardant tape wrap, and the end of the caps is resin sealed to protect against humidity. Loss angle tan = 0.00002 to 1K; Loss angle tan = 0.00001 to 10K.

Sound: Very neutral and coherent balance, they don't seem to high-light anything and I mean that in a positive way! They are a little flatter in presentation than their more expensive brother, the Silver Z-Cap but still better than the Clarity Cap SA in depth and spatial information. In direct comparison with a Clarity Cap SA they are less up-front in the lower treble and have a better texturing of acoustic instruments like a violin for example. In the upper treble they are slightly brighter than a Mundorf Silver/Gold which probably explains the good spatial information and separation. Compared to the Jantzen Audio Silver Z-Cap I find them the more musical of the two and I will definitely add them to my favourites list.

Verdict: 10

Jantzen Audio Silver Z-Cap MKP 800VDC - 2% tolerance

Technical specifications: metallized polypropylene film, high-grade silver lead wire. The finish is a flame-retardant tape wrap, and the end of the caps is resin sealed to protect against humidity. Loss angle tan = 0.00002 to 1K; Loss angle tan = 0.00001 to 10K.

Sound: More transparent than the less expensive Superior Z-Cap, very detailed. Sometimes too detailed for my liking which makes them less coherent than the Superior Z-Cap. They give some emphasis on the upper treble but are still more civilised than a Clarity Cap SA for example; they have a so-called “high-end” flair. Objectively speaking they are better than the Superior Z-Cap but I prefer the Superior Z-Cap for it is more neutral presentation. I guess you could call the Jantzen Audio Silver Z-Cap the “audiophile” capacitor and the Jantzen Audio Superior Z-Cap the “musical” capacitor.

Verdict: 10,5

Jantzen Audio Silver Gold Z-Cap MKP 250VDC - 2% tolerance

Technical specifications (according to manufacturer): “Silver/Gold Metallized Polypropylene; Metallisation 99% Silver and 1% Gold; Non inductive construction; Range 0.01uF to 10uF”

Sound: Also like the Silver Z-Cap, the Janzten Silver Gold Z-cap is very detailed and sometimes too detailed for my liking, although I do find them less analytic than the Silver Z-Cap, they are smoother and therefore more pleasant to listen too. They do well in upgrading existing crossovers of speakers that are a bit on the laid-back side of neutral, they will pump some life and energy into such a system. Janzten Audio themselves state: “more resolution, more sound stage. Lots of dynamics. Fast reaction, live feeling and natural sound.” I would say the same except for the last bit, live pop-music feeling yes, live classical music feeling and natural sound, no. But still overall a very nice capacitor.

Verdict: 11-

JB Capacitors JFX 250VDC and 630VDC - 5% tolerance

Technical specifications (according to manufacturer): "Pemium Metallized Polypropylene Film Capacitor; quick transient design; high precise capacitance ±3%,±5%; very low dielectric absorption factor; very low dissipation factor; very low ESR; very low inductance; excellent handling of high current audio pulses; capacitance range 0.047~100uF; capacitance tolerance ±3% and ±5% @ 1KHz; rated voltage 250/400/630VDC; dissipation factor 0.0020 @ 1KHz; leads diameter 0.6/0.8/1.0/1.2mm tinned pure copper."

Sound: First of all I must mention that JB Capacitors were very kind to send me a large selection of different values and voltage ratings of their JFX capacitors. This made it easier to test the capacitors in a large range of different loudspeakers and I could also check the tolerance ratings. All the capacitors that I received measured well within the 5% tolerance rating. How do they perform? Well, after plenty of burn-in time (that they need to open-up) they deliver a wide and open sound stage. Nice and neutral, but the signature can be a bit upfront and flat. In some cases the "flat" sound can work well, for example if you just want to keep things tame or if you are replacing some old electrolytics or MKT's and don't want to shift the tonal balance too much. One of those things that doesn’t impress at first but sort of grows on you after a while. They are also fine when used in parallel woofer sections or as a less critical midrange series capacitor. But if you are looking for something in the tweeter's direct signal path I would advise to look elsewhere - in a similar range their JSX types for example are more open and clear, especially the higher voltage types. During testing, the JB Capacitors JFX actually reminded me quite a lot of the Erse Pulse-X that I tested a couple of years ago, so I got the Erse out again and plugged them into the same test loop. They seem so similar that, to be honest, I couldn't tell if I was listening to a JB Capacitors JFX or an Erse Pulse-X! With the JFX things like massed baroque choir become muddled, they don't seem to keep a clear overview when the programme material gets complex. Also brass missed that shine that is so typical for such wind instruments. I guess I would add the JB Capacitors JFX to the list of capacitors like the Axon True Cap, Intertechnik Audyn Cap QS, Erse Pulse-X, etc. The price / quality ratio is very good. I can highly recommend this capacitor if you are looking for a nice, but not too expensive MKP.

Verdict: 6,5

JB Capacitors JSX 250VDC and 630VDC - 5% tolerance

Technical specifications (according to manufacturer): "Premium Metallized Polypropylene Film Capacitor; quick transient design; high precise capacitance ±3%,±5%; very low dielectric absorption factor; very low dissipation factor; very low ESR; very low inductance; excellent handling of high current audio pulses; capacitance range 0.1~100uF; capacitance tolerance ±3% and ±5% @ 1KHz; rated voltage 250/400/630VDC; dissipation factor 0.0010 @ 1KHz; leads diameter 0.6/0.8/1.0/1.2mm silver-plated copper wire."

Sound: First of all I must mention that JB Capacitors were very kind to send me a large selection of different values and voltage ratings of their JSX capacitors. This made it easier to test the capacitors in a large range of different loudspeakers and I could also check the tolerance ratings. All the capacitors that I received measured well within the rated 5% tolerance. Soundwise you can hear that the JSX comes from the same family as the JFX but I prefer the JSX to the JFX because they are clearer (especially the higher voltage types) which makes them less muddled and therefore easier to follow the musical content. When compared to one of my favourite low-cost capacitors, the Mundorf EVO Oil, it is evident that the JB Capacitors JSX still lacks some clarity and sound a bit forward. The Mundorf EVO Oil emphasizes the top-end a fraction anyway, so maybe that comparison is not completely fair. But on the otherhand it does explain on which side of neutral both capacitors stand regarding the amount of top end clarity. What the EVO Oil does do much better is reproducing spatial information, the image lacks some depth with the JSX but not as much as with the JFX. Comparing the JB Capacitors with other low cost types I would say that it comes closest to the Jantzen Audio Cross Cap or Jantzen Audio Standard Z-Cap. Comparing them to the Obbligato aluminium-foil MKP there are similarities in that they are both a little upfront sounding when compared to higher grade types, but at least the Obbligato aluminium-foil MKP shows a more open tonal balance. Like many of these basic quality MKP's JB Capacitors JSX lacks some sophistication but their overall tonal balance is reasonably neutral. The price / quality ratio is very good. I can highly recommend this capacitor if you are looking for a nice, but not too expensive MKP. Good overall qualities and an upgrade from the standard JFX.

Verdict: 7

Jupiter Condenser HT BeesWax Paper 600VDC - 5% tolerance

Technical specifications (according to manufacturer): "Old Concept New Technology - A unique blend of the old sound with refinements of the new. New high temp series replaces the original beeswax/paper design. Jupiter Condenser HT line of capacitors features a reinforced beeswax paper dielectric and (with further improved impregnation techinques) is now cased in a non drip/melt casing and can withstand higher operating temperatures. Perfect for DIY and OEM use where natural sound is demanded. Operating Temperature: 70°C; Voltage: 600VDC - Tested at 1200VDC at two stages of production; Aluminum Foil; Silver Lead wire 20awg; Cryogenic Treatment; Made in USA of US materials."

Sound: I found the Jupiter HT BeesWax Paper to be very spatious and rich in harmonic texture. They are clear and open but there is never and over-emphasis on any area. Compared to AmpOhm aluminium foil types the Jupiter has more air and they produce a wider image where as the AmpOhm project more front to back. Still not quite as neutral and coherent sounding as the Duelund VSF but at the same high quality level as the top of the range Mundorf's. They have a nice fleshy treble with a rich midrange to match. They act well under all conditions and don't seem to have any preferences. I find them very pleasing to listen to.

Verdict: 11,5

Jupiter Condenser Flat Stacked Beeswax Cryo Capacitors 100VDC / 300VDC / 400VDC - 5% tolerance

Technical specifications (according to manufacturer): "Jupiter Condenser have applied the same materials and processes used to make their HT line of capacitors to make there all new Flat Stack capacitors, the VT range is rated at 100V and has been specifically designed for loudpeaker crossover use. They feature a reinforced beeswax paper dielectric cased in a non-drip/melt casing and can withstand higher operating temperatures. Available values are 1uF to 15uF. For higher voltage application there is the Flat Stack HT range. For production, a computer controlled wax vacuum impregnation system was engineered and built by Jupiter Condenser and section processing is based on techniques developed by Western Electric and RCA. This is capable of deep vacuum and high pressure, providing consistent impregnation with more gas and moisture removal. New proprietary measures of strengthening dielectric properties have been developed and employed which yield higher insulation resistance and allow greater operating temperatures. Wax and paper construction yields a very well mechanically damped capacitor, free from electrostatic and mechanical ringing. Tolerance ±5% standard; Rated voltage 100VDC (VT type) 300VDC and 400VDC (HT types); Pure silver leadouts 1mm diameter; Max temperature +70°C; Beeswax impregnated paper dielectric; Aluminum Foil electrode material; Cryogenically treated."

Sound: The Jupiter Flat Stacked capacitors are similar in sound to the HT BeesWax Paper types in that they are very spatious and have a nice fleshy treble and a rich harmonic texture. Compared to the HT BeesWax Paper types the Flat Stacked capacitors are actually even meatier and more intimate, in a direct A-B comparsion the HT BeesWax sounds a fraction more forward. The Flat Stacked are warmer and richer in texture than the Rike Audio S-Cap but also a little more laid-back in presentation, slightly romantic sounding if you like. The Rike Audio S-Cap seems a little more dynamic and open than the Jupiter's. When comparing the Flat Stacked to a Jantzen Audio Superior Z-Cap you get a more rich and colourfull image with the Flat Stacked, especially noticable when listening to things like a solo piano where the harmonic overtones have more layers to the texture making things more convincing. I found the Jupiter's to take all types of music with no particular preference for one type over another, which is a good thing in my opinion. Also, the higher voltage types seemed to sound a tad more spatious, not much, but noticable in a direct AB comparison. Overall very nice indeed! Another plus point: their tolerances are relatively small for paper based capacitors, you usually see higher tolerances with this type of capacitor.

Verdict: 12-

LCR Capacitors FSC tubular foil polystyrene, axial lead,  0,01uF 160Vdc – 2,5% tolerance

Technical specifications (according to manufacturer): “Polystyrene is a superior dielectric material with exceptionally high insulation resistance and low loss. Aluminium foil electrodes are used and terminal wires are welded to them to ensure satisfactory performance at low voltage and high frequency. Low temperature coefficient. Close capacitance tolerance. Extreme capacitance stability. Low power factor. High insulation resistance. Small physical size. These are recommended for use in I.F. transformers, tuned circuits, pulse networks, laboratory standards, timing circuits, analogue and digital computing circuits and many other applications where superior qualities are used to advantage. Marking: Wherever possible capacitance tolerance and working voltage are clearly indicated by black digital lettering, but on small components a letter code is used for tolerance.”

Sound: Like the Vishay MKP1837 they really clear things up when used as a small parallel capacitor. They take away the grainy edge from most capacitors. They give a gain in clarity and detail making instruments better separable from each other, the violins in an orchestra are a group of individual violins instead of one mass. They don't do the disappearing-act quite as well as the Vishay MKP1837 but they come close. I also find them to match well with "analogue" sounding capacitors like paper-in-oil types, etc in which they improve clarity at the top end of the spectrum.

Verdict: An alternative to the Vishay MKP1837 if you are looking for an even more detailed sound.

Le Clanché PPM MKP 250VDC – 5% tolerance

Technical specifications: Industrial application capacitor. Although the tolerance stated is meant to be +/- 5%, I measured all of them and they were all spot-on the stated capacitance.

Sound: Similar in character to the Mundorf M-CAP but with more detail right down into the midrange. Pleasant open sounding and smooth. Less depth than the ASC MKP in oil. I quite like these!

Verdict: 7,5

Mundorf MCap MKP 250VDC – 5% tolerance

Technical specifications (according to manufacturer): "The MCap is an audiophile metallized polypropylene capacitor. In selection of the materials used, special attention was given to the sound properties. The practically induction-free type of construction and the low loss factor of the MCap® results in a very "quick" capacitor. The MCap® forms the basis for vivid music reproduction rich in nuance. The MCap series of audiophile MKP condensers has been expanded by a complete 250 VDC lineup in order to avoid any loss of sonically quality caused by lack of space or a tightened budget."

Sound: The Mundorf MCap 250VDC has exactly the same tonal balance as the 400VDC type I originally tested. The only difference being a very small lack of fine detail and image size compared to the higher VDC rating MCap's.

Verdict: 7-

Mundorf MCap MKP 400VDC – 3% tolerance

Technical specifications (according to manufacturer): "The Mundorf MCap is a high quality metallized polypropylene capacitor. Great care taken during the production is meant to guarantee constant high quality and minimum electrical and mechanical tolerances. Thus, in the final inspection, maximum deviations in capacitance of 1.5 % are measured, so the guaranteed value of 3 % is far exceeded. The practically induction-free type of construction and the low loss factor of the MCap result in a very "quick" capacitor". Used by Audiodata, Sonus Faber, Lumen White and many others.

Sound: I find the Mundorf MCap a little better than the Intertechnik MKP QS. Nothing extreme but noticeable, especially if all capacitors in your filter are MCap's. A little more lively and with better speration than the Audyn Cap MKP-QS with slightly more midrange openness.

Verdict: 7

Mundorf MCap MKP 630VDC – 3% tolerance

Technical specifications (according to manufacturer): "The Mundorf MCap is a high quality metallized polypropylene capacitor. Great care taken during the production is meant to guarantee constant high quality and minimum electrical and mechanical tolerances. Thus, in the final inspection, maximum deviations in capacitance of 1.5 % are measured, so the guaranteed value of 3 % is far exceeded." I found them to be within 1% accurate.

Sound: The Mundorf MCap is available in three different VDC ratings (250/400/630VDC). What seems to happen whith an increase in VDC rating, is the more you get regarding terms as seperation of the individual instruments (massed violins for example), the deeper the image size and there is also an increase in the amount of fine detail. The differences are very small and there is absolutely no change in tonal balance, they all have the same character. On some types of music I couldn't hear any differences at all but with high quality recordings on a high quality system the relative differences could be heard - nothing shocking, but noticable most of the time. Also these relative differences could only be distiguished when A-B switching between the three, I mean sometimes I was listening to (what turned out to be) a 250VDC type and said "this sounds great" (thinking this must be the 630VDC MCap), then when switched to another VDC rating I sensed a very slight improvement. So one could be perfectly happy with the lower VDC capacitors but if one has the possibility to choose, go for the MCap 630VDC types.

Verdict: 7+

Mundorf MCap RXF MKP 600VDC - 3% tolerance

Technical specifications (according to manufacturer): "With the MCap RXF (Radial Xtra Flat), Mundorf presents an entirely new, innovative type of capacitor. The benefits of the special winding geometry, starting with the extremely compact shape, easily appeal to both the professional audio developer as well as the ambitious hi-fi amateur. The large winding diameter with its internal contact surface, designed to be as large as possible, and the exceptionally large design of the connection endplates guarantee the shortest signal paths with little loss. This in turn results in an extremely low rest resistance and very low equivalent series inductivity. The polypropylene foil used was dampened with a metal layer of maximum thickness. The additional grouting of the winding in the casing provides the capacitor with sustained protection from microphonic effects and furthermore prevents the winding from vibrating. This all has the objective of achieving the lowest loss of energy and distortion in tone. The MCap RXF will convince you of its appeal on the first go with a strikingly natural, tonal liveliness and the transparent nuanced dynamic of the music sound with which it once more sets the appropriate musical benchmark for all capacitors which, in their case, must forego the expensive Supreme winding technology for reasons of cost."

Sound: Compared to the standard MCap they are cleaner and more transparent. The MCap's are slightly more midrange focussed. The RXF are nicely detailed without being edgy but could be a little smoother sometimes, they tend to draw your attention to the top-end more than the rest. This top-end focus does gather points regarding the retrieval of ambient information and reverberation. But I find the lower treble lacks some refinement, a bit "in your face". They do get better over time but a slight glare stays. The Supreme is similar in spatial information but far more refined and therefore better. I also find the Clarity Cap PX to be smoother, rounder and therefore scores better in long term listening. This is most evident on well-recorded classical music. Overall I am still very positive about the RXF (especially considering the price) and see them as a welcome arrival for the budget sensitive user. They could also be a handy upgrade for existing crossovers were space is limited because they are built more compact than regular axial capacitors, especially when you need large values.

Verdict: 8

Mundorf MCap EVO Aluminium 450VDC - 3% tolerance

Technical specifications (according to manufacturer): "The main feature of the EVOLUTION winding technology comes with its unusual narrow but high capacitor reel. This geometry results in two, acoustically clearly perceptable benefits in comparison to traditional, easier to produce capacitors. Firstly, a shorter but utmost low loss signal path between huge contact areas is granted, thus an extreme low equivalent series resistance (ESR). Secondly, in order to meet capacitance the number of paralleled windings is larger than with regular caps, thus an effectively minimized equivalent series inductivity (ESL). After the utmost precise EVO winding process, these reels are cast by hand in especially developed housings. By that, vibrations and microphonic effects on the reel are most effectively avoided. Furthermore, we only employ purest polypropylene foil vaporized with the thickest metal layer possible. Plus the unusual asymmetric wire lengths allow both mounting directions on PC boards, horizontal and vertical. Altogether, the new MCap EVO‘s, above mentioned features lead to colorful livelyhood, remarkable micro dynamic alongside enhanced transparency, authenticity and 3-dimensional stereophony. As the direct successor of the RXF, the MCap EVO marks the surprisingly inexpensive entry into the audiophile EVO line-up."

Sound: The compactly built Mundorf MCap EVO Aluminium is basically overall pleasent to listen to and has the well kwown Mundorf sound signature. Reasonably neutral with a slight emphasis towards higher frequencies making it sound a little more transparant than some darker, more rounded-off types. Compared to the higher grade Mundorf EVO capacitors is can sound a bit flat at times, lacking some depth in the image but don't lean too heavy on this - the EVO Aluminium as a low priced capacitor so don't expect miracles. In direct comparison to a Vishay MKP1839HQ they are more open, in direct comparison to the more expensive, but also very affordable Intertechnik Audyn Cap Plus the EVO Aluminium offers more transparancy but at the same time less coherency. The Audyn Cap Plus has a more balanced and tonally even presentation.

Verdict: 7,5

Mundorf MCap EVO Oil 450VDC - 3% tolerance

Technical specifications (according to manufacturer): "The MCap EVO Oil combines the MCap EVO‘s sound characteristic in a perfect way with the acoustical advantages of oil impregnated capacitors. Furthermore, its additional wrapping as well as its imprint in red-metallic impart an appropriate quality look and haptic."

Sound: The compactly built Mundorf MCap EVO Oil is a big step up from the basic MCap EVO Aluminium and actually it is my personal favourite of the three EVO type's although it's more expensive brother, the EVO Silver Gold Oil, does still excel in fine, airy top-end detail. I found the MCap Evo Oil to do especially well on vocals, male and female voices come out well rendered and relatively natural sounding with a certain richness. Wind instruments (brass or wood) also sound convincing with the EVO Oil, they seem to have a natural edge to them. Image depth is another strong feature of the EVO Oil although not up to the high level of Mundorf's Supreme range. All in all the MCap EVO Oil seems to be the best overall performer of the EVO range unless you are into piano music - then the MCap EVO Silver Gold Oil scores lots of points for top-register clarity. Brighter than an Intertechnik Audyn Cap Plus that costs roughly the same but at the same time not as full sounding. I found that the EVO Oil likes to be mixed with Jantzen Audio Superior Z-Caps, the slightly bright nature of the EVO Oil blends well with the "boringly" neutral but spatious sounding Superior Z-Cap. For example when used for a large value midrange series capacitor: mixed at about one third Jantzen Audio Superior Z-Cap and two thirds Mundorf MCap EVO Oil, together they form a well-balanced rich and spatious combo at a reasonable price.

Verdict: 8,5

Mundorf MCap EVO Silver Gold Oil 450VDC - 3% tolerance

Technical specifications (according to manufacturer): "The all-new MCap EVO Silver Gold Oil unites the audible features of the MCap EVO Oil with those of a Silver Gold metallization to a breathtakingly beautiful music performance. The beauty of the MCap EVO Silver Gold Oil’s music performance is only surpassed by Mundorf‘s top-line Supreme capacitors"

Sound: The Mundorf MCap EVO Silver Gold Oil really stands out when it comes to instrumental classical music. Especailly if you have a fetish for grand piano's you will like the MCap EVO Silver Gold Oil! The rich clarity in the range from C5 upwards is addictive, making a Yamaha Concert Grand sound very articulate and realistically bright. The overall sound is clean and airy with actually more fine detail than the Mundorf Supreme but the Supreme win's when things get complicated and loud by keeping the overview. Due to the clear nature of the EVO Silver Gold Oil sibilance is a little more pronounced than with the MCap Supreme that comes across more civilized and coherent. The MCap EVO Silver Gold Oil does need some time to burn-in and calm down. Fresh out of the box I found them rather nervous, give them at least 50 hours to mellow out. One major plus point about the MCap EVO Silver Gold Oil is it's very compact build, compared to the MCap Supreme it is only a third to a quarter of the size (depending on the capacitance value) which makes it handy if you are looking for a high quality capacitor and the available space is rather limited. The EVO Silver Gold Oil can be slightly on the "toppy" side of neutral at times, so it does mix well with capacitors that sound a little mid-range forward, like the Intertechnik Audyn Cap Plus for example.

Verdict: 9-

Mundorf MCap Supreme MKP 800VDC – 2% tolerance

Technical specifications (according to manufacturer): "1. Special induction-free winding technology: Two capacitor windings are interleaved so that their inductances effectively cancel each other out. These two windings are connected in series. This means that it takes two 2uF windings to make a single 1uF MCap Supreme capacitor - the same amount that it would take to produce a full 4uF of capacity using conventional technology! 2. Best available materials: The polypropylene film used for the MCap Supreme has exceptionally low loss characteristics. 3. Sturdy plastic and aluminium cases: This prevents microphone effect feedback thus protecting important signal details."

Sound: The MCap Supreme delivers an open and spatial sound with lots of depth. Good reproduction of the musical nuances with detail and depth from the high treble right down into the low mid-range without exaggerating things. Clear and transparent sounding cap with a good sound stage. They provide a good improvement in clarity, focus and dynamics compared to standard quality MKP's and sound "meatier" than the Mundorf MCap EVO Silver Gold Oil, more mature and a tad warmer sounding as well. The degree of improvement is comparable to upgrading to high-end cables and interconnects. I must say I was impressed when I first auditioned them several years ago and still like to use them. Where as cheaper capacitors get can lost when fed complex materal, the Mundorf MCap Supreme keeps the overview on things like a full scale orchestra. I also found that the Mundorf MCap Supreme mixes very nicely with Clarity Cap SA capacitors.

Verdict: 10


Mundorf MCap Supreme Silver Oil MKP 1200VDC - 2% tolerance

Technical specifications (according to manufacturer): "The MCap Supreme Silver Oil is an oil impregnated metallised polyprophylene dielectric capacitor. As the name indicates, high-purity silver is used for the capacitor coating, and the winding is impregnated with a special oil developed in an exhaustive series of experiments and listening tests. Both these features contribute to an even fuller and smoother tonal richness and diversity. Our state-of-the-art metallised polyprophylene foils make it possible to maintain extremely low production tolerances that cannot be achieved with traditional oil/paper capacitor designs. This is also the first time that the benefits of oil-impregnated capacitor design have been successfully combined with the well-known long-term stability of polypropylene foil and internal series wiring for induction-free SUPREME performance. Its lively reproduction of music impresses in particular with its subtly dynamic speed, precision and marked fine detail."

Sound: The MCap Supreme Silver Oil is one of my favourite capacitors! I can only underline what Mundorf states:  “…wonderfully spacious and detailed sound reproduction … full and smooth tonal richness and diversity. This capacitor's ability to bring out the finest nuances and the subtlest distinctions make the music sound more alive and “juicy”, …Wonderfully spacious music reproduction… ”. Music detail and depth throughout from top to bottom. Very smooth and liquid. To exaggerate things: it makes a standard Supreme Cap sound slightly rough!

Verdict: 11

Mundorf MCap Supreme Silver Gold 1200VDC - 2% tolerance

Technical specifications (according to manufacturer): "The metallization of the capacitor foil for our MCap Supreme Silver Gold consists of pure silver with an admixture of 1% pure gold. Gold alters the crystalline structure of silver and maximises its very good electrical conductivity. The outstanding properties of the MCap Supreme - high definition and auditory ambiance of the music playback - are once again audibly enhanced and substantially enriched in finely nuanced timbres through the utilisation of silver/gold. In this capacitor MCap Supreme silver/gold speed and precision combine harmonically with beauty and elegance."

Sound: Nicely clear and transparent, rich textured treble, very spacious; front to back and left to right, very good separation of the individual instruments, deep black background, clean and dynamic, heaps of micro-detail information, the details get high-lighted a little but nothing to worry about. I know one could easily think that this capacitor must be good because everyone says so and it is very expensive but I have tried to keep my objective view and even so I am very impressed. Were I would describe the Silver/Oil as extremely neutral, I would describe the Silver/Gold as extremely natural if you know what I mean. Acoustic instruments like a viola da gamba sound really life-like. In comparison to the Duelund VSF-Cu copper-foil capacitor they can sound a little bright in the top-end, but this can be a plus point if you want to brighten up a dull sounding system or you just dig those so-called high-end recordings with bells, chimes and things. They are by no means harsh, just on the clear side of neutral sometimes.

Verdict: 11+

Mundorf MCap Supreme Silver Gold Oil 1200VDC - 2% tolerance

Technical specifications (according to manufacturer): "The MCap Supreme Silver Gold Oil is definitely the top-of-the line model of our oil impregnated capacitors. In comparison with the Silver/Oil version, it technically features a further extended lifetime. More importantly, sonically the Silver/Gold/Oil version stands out due to its wonderful natural singing and exceptional micro dynamic, same time." Capacitance: 0.010uF-10uF; Dielectric: Polyprophylene; Metallisation: 99.99% silver, 1% gold; Purity of silver: min. 99.97% typ. 99.99%; Purity of gold: min. 99.97% typ. 99.99%

Sound: At this level we are talking about a really serious capacitor, so my findings are relative to other exotic types. They are richer and better layered than the Mundorf Silver Gold (without the oil) and they seem more open and more spatial. Compared to the Duelund VSF-Cu they are not as rich in harmonic overtones. The Duelund VSF-Cu creates smoother harmonics and a better midrange balance but the Mundorf Silver Gold Oil really excels in image depth - call it bowling alley depth! In direct comparison, the Duelund VSF-Cu sounds flatter (a bit more 2D) and a little rounded-off at the top. Like most Mundorf capacitors, the Silver Gold Oil has a slight hint of top-end emphasis, this probably contributes to the perceived spatiality and micro-detailing. But I am very happy to live with that, these capacitors are so quiet and really let you look very deep into the recording!

Verdict: 12+

North Creek Crescendo Film and Foil MKP 200VDC - 10% tolerance

Technical specifications (according to manufacturer): “Released in 1996, these capacitors were designed with a lush, rich midrange and romantic but detailed top end; a tonality opposite that of other large film-and-foil capacitors. Proper application of the thick 200 Volt film results in a tonal continuity from the midrange through the treble extremes, and balances the midrange correctly with the upper octaves. The extreme top end of the Crescendo capacitors is soft and very quiet. Although Crescendo Harmonically Balanced film-and-foil capacitors were designed to operate as a single capacitor in most tweeter circuits, they also benefit from paralleling and cascading with the higher voltage Crescendo capacitors. They also make an excellent parallel cap when paired with most other base caps for high performance midrange circuits, and can be configured in large pure film-and-foil stacks for the ultimate in midrange performance”. Although the tolerance stated is meant to be a poor +/- 10%, I measured all of them and they were all within about 1% the stated capacitance – the worst one measured 10,12uF.

Sound: Well all the above is just sales talk! Okay, they are very good capacitors with good separation of the individual instruments and a nice deep sound stage but the major drawback is they have a sort of loudness built-in, I prefer components to be more neutral. Like with the Hovland Musicap (of which they remind me of the most) I have a love / hate relationship with them: they don't mate with all types of tweeters, they dont make an excellent match for most aluminium and titanium domes. I tried them in the HATT-MkIII and felt like wanting to increase the L-pad function of the tweeter. If in series with a very nice soft-dome tweeter they seem to bring out more detail than usual from such a tweeter compared to when used with other, more round sounding caps. I had good results with the Seas Excel tweeter used in the (Mezzo) Proteus but other soft-domes should also benefit the same way. If your system tends to be a little on the bright or clinic side they might sound awful. But you do get more detail and a better sound stage compared to if you used an Audyn Cap QS or Le Clanché. Here's a good tip: Use them in combination with other caps; they will clean up a cheap Intertechnik Audyn Cap just nicely creating a well-balanced sound.

Verdict: 8

Obbligato aluminium-foil MKP 630VDC – 5% tolerance

Technical specifications: Chinese built, extra tight winding, no voids and thick-coated aluminium film imported from Germany. Very low inductance. Lead-outs are tinned copper, solid core.

Sound: Analogue is the word that keeps popping-up in my head when trying to describe these capacitors. They have a rich texture and produce an open and smooth image with realistic dynamics and good retrieval of ambient information. They have slightly less depth than a Clarity Cap DTAC but are also very detailed and never get harsh. They seem to have a sort of detailed warmth about them. In a direct comparison to the Clarity Cap PX, I would say that they are in the same league up to / into the midrange; however the Obbligato have more definition in the upper mid and treble; tones such as an acoustic guitar or solo violin attacks seem to gain in clarity and have better separation, the image seems to be less flat. Therefore the timbre of instruments is a bit more accurate with more air in between, allowing a more naturalness of the sound scene. Though they have higher definition, they are never harsh nor harsher than the smooth Clarity Cap PX and let me hear some nice but soft inner details. That's probably why I define them as "analogue".

Verdict: 10-

Obbligato Film Oil MKP 630VDC - 5% tolerance

Technical specifications: Chinese built, extra tight winding, no voids and thick-coated aluminium film imported from Germany. Very low inductance. Lead-outs are tinned copper, solid core.

Sound: pleasant “analogue” approach to music with a nice clear, smooth presentation and good separation. Left to right imaging and front to back sound stage is realistic but not as open as the dry type Obbligato. Also the overall balance is a little more forward than the Obbligato aluminium foil type, especially fresh out of the box. So give them some time to burn-in.

Verdict: 9

Rike Audio S-Cap Paper in Oil Aluminium Foil 600VDC - 10% tolerance

Technical specifications: Rike Audio are based in Germany, they manufacture seriously high end valve equipment. To help them achieve the sound they wanted they decided to create their very own paper in oil capacitors. After 5 years of development, they arrived at the Rike Audio S-Cap. Primarily the S-Cap is an aluminium paper in oil capacitor with a double-layered dielectric, it is designed for 600VDC rated use and has 10% tolerance. Every capacitor is tested with a test voltage of 1625VDC. Capacitors from 0,01uF to 1,0uF are axial types supplied in cylindrical housing. Capacitors 1,1 to 5,0 uF are in rectangular shape and 5,1uF to 30uF in an oval shaped housing.

Sound: The Rike Audio S-Cap seems to be several capacitors all in one: they are very coherent, nothing is over high-lighted, they just do all things right. They are clear but never too bright and open things up nicely without any artificial emphasis on certain parts of the spectrum. They have depth that lets you look deep into the recorded information in a very natural and coherent way, seperating the individual instruments of an orchestra in a very convincing manner. Another thing that the Rike Audio S-Caps do well in making the music sound more realistic is dynamics. Compared to the Jantzen Audio Superior Z-Cap (that is about half the price I must note) they have more flow and are more spatious, in comparison the Superior Z-Cap sounds a bit "in your face". Compared to the Jupiter Condenser VT Stacked Cryo Capacitors (also an aluminium foil with paper capacitor) the S-Caps are more forward sounding. They both give a nice "analogue" feel to the music but the Jupiter sounds a tad more lush. Compared to very high-grade copper foil capacitors the Rike Audio S-Cap could do with a little more richness and tonal colour but then we are talking about capacitors that cost far more. I did find that tonal colour could be added to make them richer by mixing the Rike Audio S-Cap with Mundorf Supreme Silver Gold Oil. The SGO's added just about the right amount of top end air that the S-Caps were lacking to make the music flow better. In most configurations I found about 80% S-Cap mixed with 20% Silver Gold Oil to give just the right balance. In general I consider the Rike Audio S-Cap to be one of the capacitors that produces acoustic instruments and vocals in a very natural and convincing way, well detailed but never fatiguing. For example an Instanbul Mehmet Sultan 22" ride cymbal sounds like it should: a nice metal "ping" combined with a certain warmth. Piano music comes across very realisticly with a wide dynamic range, full-bodied and open.

Verdict: 11,5

SCR Châteauroux MKP-PB 400VDC - 2% tolerance

Technical specifications: Tinned solid-core lead-out version of the Solen Châteauroux Fast Cap PB-MKP-FC.

Sound: The Solen MKP-PB are a fraction better than the Intertechnik Audyn Cap QS (but what isn’t) but are still rather flat and lack depth and transparency. Rather coarse compared to the cheaper range Clarity Caps like the PW and APW series but they do have a similar, reasonably neutral tonal balance. What they have going for them is their very low cost, to get more spatial information and better definition you would have to look at a slightly more expensive Mundorf RXF for example if you really want to improve things.

Verdict: 6+

Solen Châteauroux Fast Cap PB-MKP-FC 400VDC - 5% tolerance

Technical specifications (according to manufacturer): “Low dielectric absorption factor; High insulation resistance; High frequency and temperature stability; Good self healing characteristics of polypropylene dialectic; High Current Capacity; Excellent Over voltage and Pulse handling capability; Low self inductance; Low equivalent series resistance; Excellent stability; Flexible leads: Tinned pure copper multi-strand insulated sleeves; Superior high frequency characteristics; High Ionisation level; Dissipation factor @ 20o C: Less than .01 %; Dielectric absorption factor at 20o C: Less than .01%; Insulation resistance @ 20C: More than 100 K megohms/mfd; Temperature range: -25o C to+85o C; Dielectric: Polypropylene Film; Working Voltage: 400VDC.” Low priced cap, same quality as SCR and Angela branded capacitors, same sizes. Why? Because they are exactly the same!

Sound: The Solen Châteauroux Fast cap is a good step–up from MKT capacitors often found in standard quality factory built speakers. Like the standard Intertechnik Audyn Cap nothing wrong with them but also nothing exciting, but if I had to choose between the two I would still go for the Solen, they seem to have a fraction more “musicality” to them. Compared with electrolytics they have much more detail, smoothness and a wider stereo image. Compared to a Mundorf Supreme Cap they sound closed-in. Midrange is slightly forward compared to more neutral caps, they can be a little nasal sounding in some configurations. Due to this character they would make a good match with Focal tweeters for example. If you have a tight budget then this is a good choice!

Verdict: 6+

Sonic Craft Sonicap GEN-I MKP 220VDC - 5% tolerance

Technical specifications (according to manufacturer): “The Sonicap is well balanced and true to the source. The word "neutral" is so loosely (and incorrectly) used that we prefer the term "balanced". While capacitors suffer from more noise (high distortion) than most audio components, the Sonicap exhibits very low noise and parasitics. The presentation is rich in harmonics, warm, without the slightest loss of detail retrieval! As a matter of fact, the micro-dynamics of the Sonicap is unmatched by anything close to its price range. All Sonicaps are tested at twice their rated voltage. The Sonicap meets or exceeds several Mil-specs. Dissipation Factor is typically better than 0.02% @ 1kHz. The Sonicap leads are tinned solid copper (high purity). Tolerances are typically better than 5%. Custom values and tighter tolerances are available. For the mods, which require a smooth presentation “unlike” that, produced by capacitors where dielectric breakdown ("self healing") is an acceptable (admirable) attribute. For the tweak who's system is well balanced and does not require "colouration band aids". For the hobbyist on a budget. Whether it is a power supply bypass, coupling, or speaker application, the Sonicap will be there!”

Sound: Compared to a standard Mundorf M-Cap they are more transparent and clearer with lots more depth. Putting a 0,01uF Vishay MKP1837 parallel to them (a good tweak for nearly any capacitor) can create even more detail and separation! They reveal micro-information in a way that reminds me of a Hovland Musicap but without the Hovland loudness effect. I didn't find them to mix well with other caps - a 50/50 mix with a standard Mundorf M-Cap gave me the funny sensation of listening to two different cap's at the same time. I can advise them if you are looking for a high-end cap but are on a relatively tight budget. Quite nice :-)

Verdict: 8,5

Super PP capacitor (SPP) MKP 400VDC – 5% tolerance

Technical specifications (according to manufacturer): 5 layers Composite dielectric, Super low DF.

Sound: First of all they need a much longer burn-in time than most capacitors, in the beginning they are rather aggressive. After burn-in I still find the top-end over-etched which gives it a slightly artificial treble. They are well detailed but I find the midrange a little under exposed, maybe they would work well in a dull sounding speaker. Spatiality is good, probably due to the high-lighted top-end but only average separation. I find them similar in character to the Evox Rifa PHE-450. They also benefit a lot from a paper-in-oil capacitor connected parallel to them. For their low price they perform quite well.

Verdict: 7,5

TRT Wonder DynamiCap MKP 210VDC – 5% tolerance

Technical specifications: “DynamiCap includes special rugged wrap and a construction with metal end caps, and individually hand soldered 19 gauge silver clad copper wonder wire leads. DynamiCap boast a virtual infinity of parallel paths through the plates, from input to output. More importantly these parallel paths are virtually the same length as one another, so all parts of the input signal arrive simultaneously at the output terminal.” Physically they are very lightweight compared to other brands of similar size.

Sound: Their name does describe them a bit: they have a wide dynamic range and sound fast and quiet - dynamics are nice and snappy, but at the same time they are not very subtle or delicate, they seem to grab attention and run away with it. Now I do find dynamics to be one of the most important factors in the aim to reproduce recorded music in a lifelike manner, but the DynamiCaps seem to lack coherency and make the music nervous and therefore fatiguing - not relaxing at all. At first they are impressive but soon they become distracting and get you listening to things like transparency, transients and detail instead of listening to the music! Use them if you want to spice things up a bit, some might call them revealing, I find them grainy. Also imaging is a little compromised, compared to a Clarity Cap PX they sound a little on the flat side, a Clarity Cap PX has more space and depth. They do form a nice upgrade from standard quality MKP's and work better as a midrange capacitor than a capacitor in the signal-path of the tweeter.

Verdict: 7,5

Vishay MKT1822 MKT 63VDC - 1% tolerance

Technical specifications: Metallized polyester film with vacuum deposited aluminium. Main applications: blocking, bypassing, filtering, timing, coupling and decoupling circuits, interference suppression in low voltage applications.

Sound: Well balanced, overall coherent sounding capacitor. It doesn't have as much depth as the more high-end type capacitors and micro-detailing is limited but somehow it did stay in the back of my head as nice and pleasent to listen to. You can boost the overall presentation a lot by adding 0,01uF's worth of MKP1837 parallel. So if you are looking for a cost effective and very compact alternative to MKP capacitors like the Solen Fast Cap, look no further!

Verdict: 6,5

Vishay MKP1837 / 0,01uF MKP 100VDC - 1% tolerance

Technical specifications: Metallised polypropylene, radial capacitor, designed for LC/RC filter circuits, coupling and de-coupling at high frequencies.

Sound: Many years ago I was tipped by Klaus Witte of Germany to try this capacitor as a small parallel cap for the Mundorf MCap Supreme. I tried them as a parallel cap for the tweeter series caps in my Progress speaker and I must say I was very impressed! To get straight to the point they don't change a Supreme into a Supreme Silver-Oil but they really do clear things up. I must admit I was sceptical at first as the value is only 10nF (0,01uF) - and the caps I was using at the time totalled to 12,6uF. The difference is most noticeable with classical music but also good quality recordings of jazz and fusion benefit: No change in sound stage width or depth but there is more concert-hall acoustics that let you get into the recording more. Not as liquid as a Mundorf Silver Oil but they did take away the slightly grainy edge from the Mundorf Supreme's. A noticable gain in clarity and transparency making instruments better separable from each other, the violins in an orchestra become a group of individual violins instead of one mass. Jazz drum brushes sound more like a brush than a "shush".

Verdict: 8,5

Vishay MKP1839HQ MKP 630VDC - 5% tolerance

Technical specifications (according to manufacturer): "AC and Pulse Metallized Polypropylene Film Capacitors MKP Axial Type; dielectric: polypropylene film; electrodes: metallized; construction: series construction; encapsulation: plastic-wrapped, epoxy resin sealed. Flame retardant; leads: tinned wire"

Sound: The Vishay MKP1839HQ's main character is that of a certain full-bodied lower treble range with a calm top-end. Compared to a more bright sounding capacitor like the Mundorf MCap Evo Aluminium they seem slighty warmer but they do lack some depth, the overall presentation is a bit flat but in line with other standard quality MKP's. On the plus side they have a relatively open sound making them good on solo violin or cello for example. Slightly less well suited for rock music or heavily processed recordings. Personally I prefer them of capacitors like the Intertechnik Audyn Cap QS or a Solen Fast Cap for being a tad more lively.

Verdict: 7

Vishay Sprague 730P MKP 250VDC – 10% tolerance

Technical specifications: “High Frequency, wrap-and-Fill, metallized polypropylene; excellent AC performance; low power dissipation; low dielectric absorption; close tolerance; high stability”

Sound: They remind me a bit of a Hovland Musicap or Dynamicap: they have a wide dynamic range and sound “fast” and “quiet” - dynamics are nice and snappy, but at the same time they are not very subtle or delicate. At first they are impressive but soon they become distracting and get you listening to things like transparency, transients and detail instead of listening to the music if you know what I mean. Use them if you want to spice things up a bit. Imaging is quite good and they do form a nice upgrade from standard quality MKP's but work better as a midrange capacitor than a capacitor in the signal-path of the tweeter.

Verdict: 8

WIMA MKP 4 100VDC – 10% tolerance<

Technical specifications: "Metallized polypropylene capacitor; high volume/capacitance ratio; self-healing; very low dissipation factor; negative capacitance change versus temperature; very low dielectric absorption; for high frequency applications e.g. sample and hold, timing, oscillating circuits, high frequency coupling and decoupling."

Sound: Similar in character to its larger brother the WIMA MKP 10 but less clear and with a smaller sound-stage. Reasonably neutral and never harsh. Compared to a Clarity Cap APW you get a more open presentation with better separation. Nice compact build designed for use on PCB's so that can be a reason why one may prefer it above an Axon True Cap for example.

Verdict: 7-

WIMA MKP 10 100VDC – 10% tolerance

Technical specifications: “Pulse capacitor. The construction principle of the series WIMA MKP 10 consists of a non-metallized dielectric film and an carrier film metallized on both sides acting as electrode. Thanks to the metallization on both sides, the electrical conductivity is considerably improved and the contact surface between the electrodes and the schoopage layer is doubled. This results in better contact and allows for high current and pulse loading capability. The properties of metallized capacitors such as excellent self-healing and high volume capacitance remain unchanged.”

Sound: With the WIMA MKP 10 you get a neutral, smooth and well balanced capacitor. For this price range the amount of transparency is quite reasonable and overall the MKP 10 is pleasant to listen to. Compared to the similar shaped and sized Mundorf RXF the presentation is more forward and a fraction less clear. But never the less it has good overall sound qualities. Don't forget to give it some time to burn-in. Fresh out of the box they sound restricted and dynamics are limited. After several weeks of use they should open-up.

Verdict: 8

WIMA MKS 4 100VDC – 10% tolerance

Technical specifications (according to manufacturer): “High volume/capacitance ratio; Self-healing; Typical applications for general DC-applications e.g. bypass, blocking, coupling and decoupling. Dielectric: polyethylene-terephthalate (PET) film; Capacitor electrodes: vacuum-deposited; Encapsulation: solvent-resistant, flame retardent plastic case with epoxy resin seal; Terminations: tinned wire.”

Sound: Good overall neutral sound that is never harsh but does have a bit of a “plastic” sounding treble. The top-end is silky and smooth. Imaging is a bit flat with not much depth. In direct comparison to the Vishay MKT1822 there is more transparency but less coherency.

Verdict: 6

In practice

For optimum results all capacitors in a loudspeaker crossovers should be of the same high quality, even the ones in correction and Zobel networks! Also, the higher the quality of the hi-fi-system the more obvious the differences between the various capacitors will be. A higher rating doesn't always mean "better", it depends on the implementation which capacitor is the best for your situation. Just replacing everything with the capacitor with the highest rating isn't always the optimal solution, try using different caps in different places throughout the crossover. It's just like cooking, a bit of pepper here, a pinch a salt there, etc. Try to obtain the blend of sound that matches your hi-fi system and personal taste the best. And oh yeah, don't forget the 0,01uF Vishay MKP1837! To be continued.....

Humble Homemade Hifi - The Netherlands - June 2002. Updated: May 2003, September 2003, January 2004, February 2004, October 2004, July 2005, April 2006, September 2007, March 2008, September 2008, February 2009, June 2009, February 2010, December 2010, December 2011, April 2013, July 2013, April 2014, August 2014. Due to continuous testing Humble Homemade Hi-Fi has the right to change information without notice.


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