I am also a new owner of the 7500. I have no ground hum or buzz. My setup is dead silent. Only thing is that unless my receiver is turned on, the amp by itself causes a noisy hum. When the receiver is on and the timer "clicks" on, the Outlaw and everything else is dead silent. I have a Monster 3600 powercenter. Should I hook a ground wire between the Outlaw and the Monster powercenter? The powercenter also has a ground hookup.

Thanks

P.S. I love my new amplifier. It's huge and very detailed in sound. Makes my Onkyo 906 dull by comparison.