BEST HARMLESS/SIGNATURELESS SPEAKERS CAPACITORS.

You may want to try the new Vcap Odam as they are more neutral than the PIOs you don’t seem to like. They are much more 3D dimensional than the Wima cap and not very big physically.

It sounds like the better caps are revealing some negative sound attributes unique to your system and ears while the Wima caps are masking it.   This would make sense as the Wima caps are not top class in resolution or refinement. That is why I say this can be very subjective based on your system’s sound including It’s relative sonic strengths and weaknesses. 

Dear @grannyring : As a fact the caps in the woofer crossovers are V-caps and in the past I use it in all the speaker crossover drivers.
Sure, I can test the 4.7uf in the tweeters to " see " first differences with the OIMP and after that with the WIMA ones. Chris is a friend and I use too V-caps teflon Cu with very good success.

Normally in audio all is room/system dependent and owner MUSIC/sound priorities, no doubt about.

My system was and follows listened by many gentlemans that are first than all MUSIC lovers and second audiophiles and some music players.

Not only for me but for them the unanimous opinion is that the room/system strength is its very high resolution where there is no place to hide any weak characteristic in any link of the system chain.

A few years ago a friend of mine and me designed and builded a SS active and current drive phonolinepreamp that in my Agon virtual system you can read about, its name Essential 3150/3160 and exist 7 gentlemans over the audio world that till today are way proudly owners.

Which were the main targets when we started that way learning project?: accuracy ( not analytical but accurated. ) and high resolution putting the overall distortions /colorations/noises and the like at minimum and fortunatelly and after hundreds ( literally. ) of tests active and passive parts, modeling boards layouts, measurements, listened long sessions of recordings where we know even the kind of " color " of its " errors " and the sound of the tick and pops, listened evaluations against other phonolinepreamps ( integrated or separated. ) like: FM Acoustics, Gryphon, Dartzeel, Boulder, Lamm, Audio Note, M.Levinson, Krell, Halcro and others ( this similar products came some from my friends and some from my dealer friends.
When we finished ( after 3 long years for the 3150 and another year for the 3160. ) we was and are totally sure not only by our " mouth " but from my audio friends that nothing ( and I mean it. ) can’t touch our Essential.
Even today is way competitive against any other unit you can name it.
For the same targets a couple years ago I finished a self design and manufacture ( along other friend. ) a unique tonearm.

I write this not because I’m a conceit person no nothing like that, far away from there.

You can read in my Agon virtual system, please read it carefully, why the system has that so high resolution with no place to hide anything.

Anyway, I will test the ODAM and will see if can beats the WIMA because the boutique caps that I tested in my system no one outperforms the WIMA in the speaker crossovers.

""" Wima caps are not top class in resolution or refinement. """

I respect your opinion but IMHO no other cap has the WIMA " perfect " resolution and about " refinement almost every audiophile has his own definition.

Now, things could be the other way around: that with out very high resolution room/system we can’t be aware of the greatness of WIMA MKP10 because is an uncolored device with no self signature: just straigth with no common audiophile adjectives to describe the sound quality.

As any one here my reference is live MUSIC and in my case: seated at near field position like the recording microphones positions: nearfield.
My main room/system target is to stay truer to the recording nearest to it.

Rigth now WIMA gave and gives me a nearest place that ever before to that target.

I’m not married with anything but MUSIC and I’m a really a severe critic of my system and try to be very objective about and over tests and evaluations/comparisons too. You can be sure that I don’t like mislead my self.

I would like to know where you made the ODAM comparison against the MKP10 or other caps against WIMA.

Your statement: """ Wima caps are not top class in resolution or refinement . """

was exactly my way of thinking several years ago and that’s why I have in " stock " some values of WIMA caps, many because everywhere where I seen Wima I changed for other " better " cap.

I will finish the overall speaker caps changes and after that maybe I will do the same ( step by step. ) in my electronics.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

JFYI
A diyaudio member did some interesting ESR tests:
https://www.diyaudio.com/forums/parts/346861-esr-measurements-capacitors.html

Dear @imhififan  :really interesting info.Btw, that Wima caps was designed in specific for HF applications and inside the very humble Wima prices that one is the cheap one,lower than 1 dollar a piece.

RM ( whom pass away.) posted ( I'm not sure but maybe in the same forum.) his coments of boutique fuses where he found out that severalof damaged electronics that he received to fix it the the source of the problem was developed by those fuses that owners changed and that according him justdoes not meet the electrical proved standards.

So it's not surprise  the information with the Duelund. Unfortunatelly does not exist measured information  that can explain the different caps coloration/distorions levels that could explain what our ears perceives.

Btw, it's worth to try/test the MKP 10 in your speaker crossovers. Just by curiosity.

R

Dear @grannyring : There is something important in our audio decisions and that’s to what kind of sound we are accustom to, this characteristic defines our sound priorities and of course if something do not likes in our system quality performance we defines what we are looking for.

One way or the other all of us are accustomed to some kind of system " colorations " accustomed and love some kind of system " distortions " but what we like not always is rigth and many times we like " things " that are not directly related with the sound of live MUSIC.

I’m no exception about and through the years and along the system up dates/up grades and tweaks ( that we loved. ) some day I took in count from where came the better quality performance from those " tweaks " and the answer is from lower and different kind of colorations and lowr every kind of distortions.

I remember when I hard wired all my electronics at the input electrical power with out the use of male and female electrical power connectors: I soldered the cables directly to the boards. With that move/action some colorations/distortions just disappeared and other gone at lower levels..
Same happened when and due that I have fully regulated and bullet proof electrical lines souce I take out all the input fuses in the system electronics. I have to say that I was using boutique fuses type.
Same result when I changed all the electronics electrical power cables by 100% silver instead cooper.

The phenomeno was and is almost always that: some colorations/distortions disappears ( like " magic ". ) and other colorations and distortions goes lower.

So, I can’t remember when I just stop to love " colorations/distortions " but all those experiences help me to recognize and be aware of colorations/distortions in very precise way and I know for sure that my WIMA changes don’t fool my self.

I have a evaluation proccess that I follows and time to time I make up-dates on it. The advantage of this proccess is ( between other things ) that’s repetitive and this makes evaluations almost " easy " but time consuming.
When I’m invited to listen a system at friends places I always bring with me 3-4 recordings only for a " fast trak " evaluation and I have to say that till today never fails.

That’s why I made and make emphasis that with an open mind try to give an opportunity to the MKP 10 at the crossovers.

After that if you still think that Wima " is not top class in resolution..." then I can tellyou that that room/system is in trouble somewhere in one or more links of the system chain. You can be sure Wima is not the culprit, Wima shows you the nearest real quality performance of your system.

Wima can give us what I was looking for in this thread title:

A HARMLESSS and SIGNATURELESS capacitor. No colorations or distortions I can be aware or detected, at least till today.

In any " event " the use of Wima caps in crossovers and does not matters if you like it or not could be a learning lesson.


Btw, before this thread I never think of Wima caps for my speakers crossovers, as a fact the idea born through this thread and fortunatelly ( for me. ) was and is an unexpected beautiful surprise and very hard to believe it till we listen.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.