Hello all.

My 7500 showed up last week, and I'd like to report that it is truly an amazing amp. (Preaching to the choir, I know.) I'm pushing Polk lsi 15's (4 ohm), which are really hard to drive. I upgraded from a Rotel RB-985, which was great, but not quite up to the task. Now, I have more punch and headroom, not to mention clarity and subtlety. And the bass! Wow.

Anyway, I'm having some hum problems, and I'm close to tracking them all down. I ordered a Jensen VRD-1FF Cable ground isolator. I think the cable is 80% of the problem. Unplugging the cable stops MOST of the noise, but there's still a little more to track down.

Here's my question... I had a friend recommend installing an isolated circuit in the room. Has anyone tried doing that? It seems to me that if I can isolate the ground problems from the cable, everything else in that room will then be on the same single ground. Make sense? Or wasted effort?