but I think there are too many people who do hear the difference to discount that. \n\n\nBut there were, probably still are some people who thought\/said the earth was flat! It does look flat too for sure.:D \n\nThat being said what would happen if you used two different mono amps on same set of speakers for testing, I'm sure there is a common sense reason as to why that won't work.\n\nFunny you brought this up, I had actually done something similar and there was no issue, in fact even sound stage was completely audibly intact, with dead center sound when it was supposed to be. \n\nIt's actually a great point and anyone who is using external amps with AVRs can try it easily any time.