From an earlier posting:
I happen to have both the CarverPro ZR1600, and a QSC RMX 1450. The QSC is good for 450 watts at very low cost and I bought it for a subwoofer application. I did not expect very good results using it full range, but I hooked it up that way as an experiment, and was pleasantly surprised. It would be a very good choice for a low cost system, where the high power rating would make it possible to use excellent speakers like Maggies (which are not costly themselves but generally require costly power amps).
The QSC does use a noisy fan, and unlike the CarverPro high efficiency digital amp, you cannot safely disconnect it. It is variable speed, controlled by temperature but it never really gets quiet.It may be possible to use a lower noise fan, as is the case for the CarverPro. The best solution is to locate it in a remote location: mine is in the cellar underneath the speakers.
Both amps sport balanced inputs, if that turns you on. Both are very solidly constructed. Warranty is 3 years for the QSC and 5 years for the CarverPro.
Both amps should be given objective consideration. The QSC costs even less than the CarverPro, and I really can't hear much wrong with it. The CarverPro invites comparison with the very best.