KZK White Line capacitor review. From Russia with love (of music)

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Hi all fellow DIY'ers :)
- and a Happy New Year!
:xmastree:
Side note: Lets NOT make this a "does capacitors affect the sound or not" kind of string. As known, a capacitor used for filtering audio (e.g. passive crossover) and not being a coupling capacitor (passing all frequencies), will impart a signature on the signal.
Please do NOT see this as an ad or commercial. I have no affiliation with KZK or Stanislav! I only found a nice component - and this is me sharing this with you ...


Introduction:
During the past few monts I've been evaluating some very interesting capacitors from Russia. What I experienced trying out these capacitors in my passive crossovers was a bit of a revelation. I thought I should share this with you guys :)

I was looking for good capacitors to use, but without the (insanely bloated) price-level of the "usual suspects" - that I (as most of us) have had lots of experience with from earlier.
After some research I found the KZK White Line capacitors to look promising. However there were no review to be found - other than on Stanislavs e-bay site. The closest I came was the Humble Homemade Hi Fi capacitor test, where the older, military made KZK K78-34, was tested and given 8,5 as the verdict value. These capacitors tested/reviewed here are quite a different animal than these military ones though!
On the White Line construction, read this: Design characteristics of KZK White Line audio capacitors

The great thing was that Stanislav, the main retailer and representative of KZK, offered me samples to test. Stanislav may offer samples to loudspeaker manufacturers/DIY'ers. Take a look here: KZK White Line - Russian Audio Grade Polypropylene Film Crossover Capacitors and see near the bottom of the page. Desk Fi is Stanislav's Russian local web-store. His e-bay store is: audio-kit.
The samples I chose was 1,5uF White Line for my multiway passive loudspeaker tweeter filter. - I was also interested in finding out if there were any difference between the 250V and 400V version of the White Lines. Stanislav kindly offered samples for me to test of both.

The implementation
The 1,5uF was placed as the series cap in the 12dB/oct filter for my Mundorf AMT 2440. These loudspeakers are using two Seas Excel W22EX001 for bass, two Bohlender Graebner Neo 8 for mid-range and a Mundorf AMT 2440 for tweeter - and are an excellent "home-brew" of mine. The Mundorf 2440 and Neo 8's are mounted in MTM configuration in a waveguide optimised to make the Neo 8 linear down to 500Hz
My loudspeakers are extremely revealing of any component, and in this position (the tweeter filter) I had previously tried out a lot of other famous high end caps. The KZK White Line would have to compete with Obbligato Gold Premium, Mundorf Supreme and Jantzen Superior Silver Z.

The review commence
I listened to quite a varied selection of top recordings for this test (a few is mentioned in parenthesis where I felt example was needed). I started out with the 400V version of the KZK White Line. The competition became very short. There was no need for any lengthy comparison to the "well known ones" mentioned earlier. They were all outperformed by the Russians, and it was not a subtle difference either. I will try to describe: In short; see through transparency ... Just as the proverbial curtain lifted. For those of you that know the brands of former caps mentioned, this may come as a shock as they're also known for these qualities compared to others. The White Line caps did not offer any artificial artifacts, as so many other Hi Fi-ones might. An impression of nothing added and nothing subtracted. Just everything shining through giving a natural insight into the music, opening up for spatial clues, the sound of air in the recording room, accurate placement of low level/small details giving more 3-dimentionality/better placement in all planes. If you will; the picture of the musical content was painted with truer colors and with finer brush-strokes. As you probably know, having such added transparency in the highs affected the entire picture. Mid-frequency and bass has got overtones ... Thus it gave the whole spectrum added definition, totally without any issues (no harshness, no sibilance, no glare, no over-focus/hot spots).

250V compared to 400V version
Remeber that I started out comparing the 400V version to the others I have been using in the same position. Physically the two are identical. Same width and length. I believe this may give even better anti-resonance properties in the 250V (please see picture below). When I A/B-compared the two versions of the KZK White Line, I found these differences between them: Fine details was presented differently. Examples: Brush on snare drum and tension on snare wires could be differentiated even more (e.g. 1st track on Jazz at the Pawnshop) with the 250V version. I was afraid that the 250V might give sibilance or that treble might be on the hot side, because of this super fine balance. Listening to many recordings with tendencies to high energy content in the highs, made me see that I didn't need to fear this. Only when putting on recordings that have problems in the highs (poor microphone placement/choice of microphne/mixing) was the listening tough (as it would be with everything but the most dull/distorting components). The sound was revealed more true. Sometimes the recording was revealed just to have more energy and not any hashness/sibilance, where other capacitors (Silver z-cap especially) would sound distorted and add to the energy. The 250V version White Line didn't add or distort ... The 400V version, in comparison, had the same resolution in the lower highs, but sounded "warmer" but with the same traits/signature, only not tipping towards the super transparent/weightlesness in the uppermost of the treble (which may be a double edged sword). Please remember what I found comparing the 400V version with "the others" I have been using. What I thought was that the 400V version would be my choice with certain metal dome tweeters or with some AMT's (e.g. the Beyma TPL 150 or 200 and others that I feel might easily become hot up top). The 250V version balances towards a feeling of total resolving-power and may accentuate a drivers tendencies, if they are towards being "hot" or, I believe, if the filter toplogy gives any ringing tendencies (higher order filters) combined with an ultra-high-resolving tweeter. My Mundorf AMT 2440's are of the most neutral and hyper resolving tweeters I know of. The 250V with a 2nd order filter was just right in my system. If something had been a bit off, I believe I would have heard it immediately. Even if I didn't try the KZK White Line in the mid-range part of my crossover, my feeling is that I might choose the 400V version there.
- In my crossover today the White Lines are parallelled by Russian FT3 teflon - to give yet more transparency (I feel).

In rounding off
Hoping this short review gave you some good pointers towards an exiting product that I happened to find through my search for "non bloated price", top range components to try out.
Stanislav at audio-kit (e-bay) and Desk Fi, have my warmest recommendations. Please see the Desk Fi pages (links above) for detailed description on how these capacitors are made.
In my opinion - and through my testing, I found this to be an absolute top component, worthy of the highest recommendations. They are "a steal" at the prices they're offered for! Hopefully the prices for these will not rise as a function of possible popularity (offer and demand) ...
A thought: Hopefully real quality at a reasonable price, like these KZK-caps, can help set standards ... maybe this is a utopia :sigh: Does the prices for "excotic audiophile parts" really only reflect offer/demand, quality and production costs - or could it be "pure, raw profiteering":vampire::whazzat::cannotbe::hypno1:

If you were to try out this product, please write about your experience in this thread. In the above I have pointet at my implementation, use and experience. (You must always be aware of the obvious in that filter topology, frequency affected and loudspeaker driver selection may give somewhat different results, but, I believe, it should not be by a large margin, given everything is "in check").
Looking forward to your experience :)

Best Regards - and best wishes for the new year, Aril N.

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Hi Mctavish :)

No, it's not advertising, but rather a find I did, wanting to share this with you with some notes on how this component affected the sound.
You may try out these yourself, to see if they will give you any similar benefits ..?

Mentioning any component positively in any posting can be seen as advertising!
Very sad if I couldn't be able to share my findings on a capacitor that haven't been mentioned much (if at all) anywhere. I feel I needed to share this with you all.

- And, - this is a review. I probably wouldn't bother writing about capacitor nn or other component not being good ...
 
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I would like to add that I have been using caps from Stanislav in my last three crossovers designs with a great success, so there is no point to accuse anybody trying to convey a message about this new great line of caps. They are definitely better than Stolen and in some cases equal to Jantzen brand.
 

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Thank you for your comment, canadian2017 :)

- In my humble, small "test" these clearly bettered Jantzen Silver Z-cap by being less sibilant - and more refined in the top treble region. This is quite good going in my book.
I have been designing and building Hi Fi (mostly loudspeakers) since the late 1980's - and these Russian capacitors are to me a really great find and among the better ones that I know of. Great find, since I have had quite enough of the "audio snobbism" that Hi Fi has been so infected with ...
 
Dear Andersonix - your answer is no interruption, but welcome (as I assume you are serious in your contribution).
Your link is to quite a selection of different types. Not very specific. (Anyway; the user needs to define his/her need and choose depending on what is needed in the application).
Did you get confused by me including information on the services of the vendor of the White Line-caps? Is this why you call this an advertisment?
- I have allready quite clearly answered mctavish about this. I must belive that you have read this answer and also my introduction to my presentation of my find ... Because this is really meant as a contribution to this community by pointing to a capacitor I found that breaks the price/performance ratio normally found. I am also quite clear about my intention by writing this review. I am serious in this. You should coose to believe me and see that my intentions are good and that ANY praise to ANY component might be seen as an advertisement, no matter who you are.
- But - you have of course read that I have allready stated this from the get-go. Your implementation of a component may vary - and the result may then vary too. Please be constructive and add your own actual findings in trying this one for your self. Nice if other implementation is considered/tested than what I did, as my test was limited.

All the Best :)
 
Sure sounds like an advertisement to me. Something you see in one of the "audiophile" rags.

I would like to interrupt this advertisement with another advertisement.

I get my cheap film caps from DIYAudio.com vendor ApexJr.
Axial Capacitors

Now back to our regularly scheduled advertisement: What does Tony Gee say about these Russian caps?

We interrupt your regularly scheduled advertisement to bring you yet more advertisement-

I used West Florida Components for my last order of axial-lead film caps for an active crossover build, highly recommended, some great deals over there, and great service.




As to the OP, are you planning on doing any THD measurements? Frequency response plots? I'm not interested in subjective testing and comparisons on things like this because they are rarely repeatable. Maybe adouble-blind ABX test with some high-quality name brand types (not audiphool brands) is in order?
 
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Hi
I used West Florida Components for my last order of axial-lead film caps for an active crossover build, highly recommended, some great deals over there, and great service.

As to the OP, are you planning on doing any THD measurements? Frequency response plots? I'm not interested in subjective testing and comparisons on things like this because they are rarely repeatable. Maybe adouble-blind ABX test with some high-quality name brand types (not audiphool brands) is in order?

Lingwendil: Thank you for recommending a capacitor I haven't heard of before. I feel such information is needed in this "snobbist" world of "audiophoolery" ... My review is just about this; one seldom to find, good choice for us ... It is not an ad - other than ANY other good review that ALSO could be considered an ad. ABX/blind-testing is very welcome, if someone wants to do this. I just do not have time (and will not sacrifice my family on the audio-altar for such a sake either ;) )

Lingwendil and also schiirrn: Concerning tests of THD, frequency plots and DF- values: Please see the site I linked to (Desk Fi) in my review and please ask KZK or Stanislav about this. Please read all the other capacitor shoot-outs there is out there! Seems like this one is getting all too much attention and "rage" from you ;)
- This one is not very different than the "Hi Fi rag-tests" (schiirrn), - just like most other tests of caps on the net.
- Yes it IS subjective and I haven't hidden this fact in any way. I have pointed at my implementation and use. This should tell something ... and is more than most tests do ...
- I am a private person with limited time for my DIY-activities. My job and private life takes most of my time. I am at present not in possesion of a lab - or lab-test equipment (in my way earlier life, as batchelor, my home was a lab at times) ... I did not know this would be required either. I have ears - and I have a very high standard of ethics! This should be enough, - just as it is for other subjective test-personel in the audio world (that doen't measure either). You should give my subjective opinion the same level of credibility, not less, not more.

To end this wrongful attack at a positive and honest report/test/find:
- As the OP -
1)I feel that more constructive feedback that actually relates to the subjective qualities described and the further participation of more such testing, preferably in other implementations, is NEEDED in further answers. This way we can know more about their subjective qualities.
2) If any of you have test equipement, Desk Fi was willing to send samples to manufacturers ... maybe you could contribute in a meaningful way ... ? (Maybe such measurements allredy exists? - You can ask)
3) More trolling from people that are overly negative and doesn't contribute in any creative way - or enjoys attacking and doesn't take notice of my explanations/answer given, will be ignored and not answered.

I really wish all of us DIY'er a great day and good audio experiences - and I hope that you feel I may contribute to something positive - and not any "audiophoolery" ... With the best intentions,
Aril :)
 
Hi wolf_teeth :)
- No, I haven't tried the Orange Line - yet ... I believe them to be a "higher tier" capacitor from KZK ... I will try them in a tube-based RIAA I am slowly finding time to build (all parts are gathered) - and possibly as coupling caps in a WE91-style 46-tube SET amp, where I'm soon to be finished gathering parts ... With my everyday schedule I will not be able to tell more about this for another year or so ... (the RIAA might be finished sooner).
It would be nice if someone chimes in here with their experience with using the Orange Line as well :)
:) Aril
 
Boydk, asuslover, wolf_teeth and others :)
As you can see, these capcitors need more constructive feedback/experience shared, as there's not much to find about them elsewhere. My findings, in my implementatation, IS very favorable. - After all it is music we are listening to and with our ears, isn't it ... measurements can only suggest at why some component has its certain traits. Boydk and others; when you have some experience, please share your findings!
If someone has got time and have the equipment needed, please share measurements too ... Hopefully KZK can share some with us ... I might find time to ask them - and if so, I will post the answer here.

Best wishes,
Aril
 
I've had success using the KZK White Line caps in a 1st order crossover for some open back speakers I built recently and love the smooth, rich, intimate sound these provide.


I ended up ordering a pair each of the 400v 3.3uF, 4.7uF and 10uFKZK White Line caps shipped direct to Tony Gee. He's going through his lengthy review process with them so they be added to his huge cap comparison on Humble Homemade Hifi. I'm curious to see how they compare seeing as they're extremely well priced, affordable caps.


I've a pair of 1uf KZK Orange Line I intend to use as output caps on my Muji Studio DAC II as well. Should be a nice improvement over what is in there stock.


Cheers


Matt
 
Well, after using the White Line caps on my tweeters for about 2 months and never being quite happy with them I've changed to Cornell Dubilier SFA44T5J219B which are made for the automotive industry. Motor run caps. I find these sound far richer, more natural and airy than the KZK White Line and cost me less to boot. Go figure right?


Anyway, I'll be using these as my base cap from now on bypassed with either Miflex KPCU-1 or Duelund JAM.
 
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