Mundorf Silver Caps

I use a B&K 885 inductance and capacitance meter to measure components as I go. Personally I just use Dayton 1% precision or Audyn's (not the expensive ones) and sometimes Sonicaps because they have values I need. If they measure the same I figure they sound the same and save my money. The few times I did try expensive caps I regretted doing so and felt that money would have been better spent elsewhere.

" I've always found the Mundorf Supreme's over saturated with color. Not sibilant, but cool, and colorful.

I prefer Clarity CMR for these reasons. I find them less euphonic and more natural, in the sense of sounding more like what I hear in person. "
  I agree completely. I find the fancy caps really are flavoring music to someones preference and they are not neutral. Kind of like tube amps sound warm compared to ss amps used in performance by various artists in real life.
 Using something like a Xilica DSP and bi-amping will allow you to duplicate any tone you want and then change it later if you wish in any way you can imagine. I recap old crossovers on speakers I am refurbing for sale but my personal system is 100% active now. I see some of these people spend thousands on caps which work for one set of speakers only. The same money would buy amps and the Xilica and work with any system.

OP if you could duplicate any nuance or tone or airy ethereal sound you wanted without breaking the bank or limiting yourself to one single system would you consider it? Sounds like you are throwing a ton of money at something hoping what you read will turn true for you too but somehow has not yet. Read up on active crossovers and DSP and see what people are doing there. Buy one system one time and have endless ability to duplicate anything you want with any speaker you may ever own.

" If you can’t tell the difference between a Dayton 1% and a TRT Teflon 1%. I understand..
I can. They are night and day. Some folks can’t tell the difference, because they actually don’t have the chops. "
  Well it is more than that. I believe that a lot of fancy capacitors and tube amps with that warm sound really are adding distortion that many people find appealing. Some like blue others like brown. The "signature" sound of various audio companies or components is merely their flavor of distortion. For instance if you went to  concert I can imagine they used professional amps and speakers. To duplicate exactly what you heard there you either have to use the same equipment or have a method of altering your playback in such a way as to be able to do so with what you own. Anything else is flavoring to suit personal preferences which to many is what it really is all about anyway. I happen to like faithful true to real life audio replication.

  My answer is to use neutral everything I can which in the case of capacitors would be those that measure well and perform their electrical duty without flavoring. It gets me closer to real life on old speakers I rebuild for people. Those fancy caps are not used in all those venues people pay big bucks to go hear live music at.

  For my personal systems I use a Xilica XP3060 to DSP and bi-amp and from there I can change  anything I need to match your flavor of cap. Or your special "warm" tube amp. As a matter of fact I can sit there with my Laptop plugged into the Xilica and change parameters on the fly live if I wish to achieve a certain effect. The advantage of this is that for what some of you spend on one set of caps that will work in one place and way only I bought a method of doing anything I want to any speaker I happen to own to the very upper limits of what that speaker is capable of producing. If I am wanting to have more than one set of speakers to listen to I can store presets for each pair of speakers I own up to 30. Or I can have various presets according to what I want to hear that night with that music genre for the same set of speakers.

It requires time and some learning far beyond what sticking a set of caps on a crossover amounts to but once you jump the hurdle a whole new world opens up and you never go back. Passive crossovers are the way things used to be but no longer have to be.