Well. Beeing sceptic here.
I believe it is about impossible to do a true blind AB test and show that even a difference exists between copper and silver cables. It is mostly the placebo effect running here. I have seen audiophiles saying this and that about the fantastic differences and implying that us not hearing it are incompetent. Sort of reminds me of the story "The emperors new clothes".
http://deoxy.org/emperors.htmIn my experience you will have larger difference moving the mics a foot in just about any direction (down, up, left, right) then changing between quality copper cables and quality silver. (I know, I know, there are stuff that really destroys sound, we are not talking these).
So, why not stand up to us scepticts and design a true blind AB test, invite a few good ears and do it. Maybe we sceptics can be convinced. Note that in a true AB test neither the listener nr the person doing the test knows which is which at the time the test is done. In order to be acceptable as a blind AB test you have to prove that there is a statistically significant difference. Now, this cannot be too hard really, every licensed drug sold in your pharmacy can pass this test and there are thousands of those.
// Gunnar