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HiI want to experiment with some of the big PIO caps that I see advertised from time to time looking like large tin cans.
I will be using them for high pass-filters.
What sort should I be looking for, and presumably some (like motor capacitors) are totally unsuitable. Some are labelled AC, some DC, some are polarised, some not. Bit of advise needed please. Sound quality is paramount.
Follow Ups:
Take a look at the OIMP (Oil Impregnated Metalized Polyproplyne) from VH-Audio.
What I have found when using these caps in speaker applications is that you get a good mix of warmth and speed. The seduction comes from the oil impregnation while maintaining speed and detail frm the film.Something furtherto consider.
I went from Solen to Jensen in some DIY speakers I owned a while back. Good caps, a definite improvement (if minor overall) over the Solens (which are IMO also damn good for the money). Parts Express (link on the home page of audio asylum) carries them. Jensen make a type just for speaker x'overs. Since you have questions I'd just call them up with your application. Make sure to ask them to match a pair as close as possible as well - very important. Parts Express probably also carries Audio Note speaker oil caps, though they're rather expensive. Another to consider (if pockets are deep enough) are Mundorf Supreme paper-in-oil, which are probably the best out there -- of any speaker caps. Just remember than any paper-in-oil cap will be much bigger than a poly cap of identical value.
then don't use them. Use polypropelene and foil or metalized polypropelene such as Solen. In any event, they should be non-polarized.
-Bill
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