Wait a Minute Do those Cardas Caps Work

You can experiment with some Aluminum foil, a scissors, and a bit of Scotch brand transparent tape.
Cut the foil into 1/2 inch wide, 2 inch long strips, roll it up around an unused RCA jack, tape it (small rubber bands also work well) and flatten the end up to seal out those evil stray electromagnetic waves. Repeat on all unused RCA ends.
The caps were made to COPY things some folks did... with guess what??? Aluminum foil strips!
Nearly free test. If it seems to do somthing for you... buy the Cardas... if not, forgeddaboudit.

I use them too, can't say that I've heard a difference though.

Here is a less expensive alternative to keeping dirt out
http://cgi.audiogon.com/cgi-bin/cl.pl?accstwek&1072541621&class&3&4&8
Dave

I use them on all my equipment especially Levinson 360s, 380s,DCS, and for the a relatively cheap price they just keeps dust out of these expensive components. A piece of mind! What is a few hundred dollars for 20,000+ dollars worth of componnets?

The most useful feature for me is to cover unused RCAs on preamp so when changing ICs behind rack with minimal clearance you instantly know where to insert new ICs........looks pretty cool to have two rows of shiny caps also.

As far as sound improvement, I have not noticed any real difference.