Yeah, been 'tooting this horn' all my audio enlightened life to mostly deaf ears with some folks telling me that certain modern design caps are superior to any PIO cap and one early audio BB banned me for recommending cheap PIO motor starter caps for [SOTA] 'HIFI' DIY speakers.

That said, using UL/CSA testing procedures, the old mil spec PCB caps we pulled from military surplus outperformed the then current vegetable oil motor starter caps, though when used in AR-1 listening tests we couldn't tell any difference, so learned early on that measurements isn't 'everything', just a frame of reference, at least in audio reproduction.

- - - Updated - - -

Quote Originally Posted by tomt View Post
Picking Capacitors - Walter G. Jung and Richard Marsh
Also: The "Sound" of Capacitors