Quote Originally Posted by emorphien
You are suggesting that if the difference can't be heard, that it is the listener's fault. However it is just as likely that it means there is actually no audible difference that a human can detect. However to be able to confirm one or the other multiple subjects are needed.
I wasn't clear. Of course if might mean that there are no audible differences. I've found as much to be true with respect to cables during my own auditions. Naturally, I have no need of further investigation in these cases since it's a local rather than a global test. Had I, I would require multiple subjects, as you stated.