The QSC boasts 1400 watts bridged @ 4 ohms. The Carvin boasts 1000 watts bridged @ 4 ohms. The QSC is $30 more. Other than these facts I know very little about the QSC. I know that the Carvin DCM 1000 that I have in my PA has worked very well and provided very clean amplification for us for the last year. How is the QSC's reliability? How clear is the sound? I am leaning towards it since it has more wattage for just $30 more, but I would love to hear opinions on it, and compared against the Carvin, if possible. Thanks!!