I've checked Mouser and they don't have the appropriate values in FKP. In MKP they are all listed as 'AC Pulse, Suppresion" that doesn't sound right for aC coupling does it?
They just highlight their properties for SMPS etc. Of course they can couple well when they can store and release high energy with fast and cool action in demanding pulse applications. In industrial capacitors the things they prioritize are different than in boutique audio caps. Form factor, value density, durability, dimensional and spec stability, self healing, all that VS cost. Its their high volume production and professional applications they keep them sanely priced, not the R&D and production facilities behind them ain't top notch. To the contrary. Just not specialized for audio.
FKP does not bring any advantage for coupling cap.
Yeah, to my ears they actually sound worse too
WIMA's are in general smaller than other brands of comperable capacitors.
Sorry, but I have to disagree here! The old SIEMENS B32650 series of MKP capacitors are considerably (!) smaller than WIMA MKP10's of the same value and voltage rating.
However, I don't know if they're still available...
Edit: This also applies for the KP 1833 series by ERO/Roederstein.
Isn't the difference between FKP and MKP that the former is film and foil, and the latter is metallized film?
F for Film/Foil, M for Metallised, and KP for Kunststoff (aka plastic) Polypropylene.
Similar rational build-up for the series code numbers.
(nature of the beast, just saying what it is, instead of coming up with some voodoo name that sounds impressive)
Another great sounding and not so expensive capacitor is Mundorf EVO silver gold oil:
An externally hosted image should be here but it was not working when we last tested it.
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