Amp Comparison It's an older article, but it still applies. There's a low priced receiver thrown in with higher end amps.
Show me any similar testing that contradicts this and I will listen. Double blind testing is the only way I know of to remove emotion / eyes from the equation.
If someone truly believes their $10,000 Krell amp sounds so much better than a $500 Denon, Yamaha,etc in terms of sound quality, then a double-blind test should end all discussion.
I just haven't EVER heard of that situation to date.