Do "Cardas Caps" make a difference?

Thanks for all your input!!

Is this what Sean is talking about? I have a YBA Integre DT amp in a small system in my home office. If the tuner is on I can hear the radio faintly as I go by an unused input when turning the input selector knob on the amp. If the CD player is also playing I can hear both (or just the CD player if the tuner is off). If I go by a used input where the component is plugged in and is not turned on, it is dead quiet. Therefore, when an RCA cable is plugged into that input, I do not get any sound if that unit is off, which is desireable. So a cap would do nothing, because it just covers the hole, but a shunt goes in the input and will cut-off the noise? A trip to Rat Shack is in order then! Thanks!

I have a dozen and I frankly can't tell if there's an improvement in sound. Oh, well, they look good enough and keep the dust out. I won't buy any more of them though.

I have 51 scattered throughout my main system. I also have some Cardas XLR caps. (The female XLR caps don't fit; I'm waiting for an upgrade.) I haven't heard any difference. I think its a good idea to keep dust and mosquitos out of the electronics. I also feel that improvements can be cumulative, i.e., multiple tweaks that are not individually audible can add up to an audible improvement. Perhaps these caps would fit in that category.

Yes. On my Audiomat Arpege they 'darken' the sonics to a point that I find quite objectionable. Proceed with caution!