I did like this comment from the page mah posted a link to-

"In nearly all domestic systems, all film caps will be quite alright - there is no real need to insist on film and foil types unless there are very high currents involved. Metallised film caps will usually have more than sufficient current carrying ability for systems rated at up to a couple of hundred Watts, and often a lot more. Much has been made of the dielectric material, but this is generally wishful thinking, perpetuated by a fringe area of audio that insists that no reasonably priced component can ever sound any good. In many cases, you may pay the top price for polypropylene, but get polyester anyway, and few people know how to tell the difference between them."

I often see people spend incredible amounts of money on caps only to make glaring mistakes in other areas...in other words, gaining a few percent with top dog caps and losing back 20% by setting up the system badly...

If you spend more on crossover caps than your amp cost you may want to examine priorities...

It's a SYSTEM APPROACH that sounds best, many have a bunch of components that somewhat work together...and though many sound fine, could be bettered. Figure out the system's weak points and improve those FIRST...

Sorry thought it was Sunday, guess I gave the sermon early.