Thanks Matt.

I'm sure the answer is not a short one but how do I sort through these endless amplifier choices and find "true clean power". I figure there has to be method to comparing amps. For starters, like the suggestion above, how do I assess the "cleanness" of the QSC-GX5. The stats look pretty impressive to me but what am I missing? I'm a very scientific person so I'm convinced there is a way to get make a better comparison.