This may be comparing apples to oranges, but I'm a spec-sheet kinda guy...and they look similar to me. Talking about amps like Crown, Behringer, QSC vs. amps like NAD, Outlaw, Rotel. I know that many people use prosound amps on their sub, where freq response isn't critical...big power is. But what about on you main 5 (or 7) speakers? I've noticed that most of the prosound amps don't have RCA ins...but that easily fixable with some 1/4"-to-RCA plugs from radio shack...I doubt there'd be any signal loss with it. Some of the better prosound amps have better than 100db S/N ratios, .01 THD, etc. Here's an example Thanks for your input.