Ok, I've done as much as I know how to do and still can't figure out why I'm getting very noticeable feedback and moderate levels (and substantially worse at higher dBs). I don't even know if that's the right terminology for my issue: by feedback/noise I mean a high pitched buzzing that increases as the dBs increase. If anyone has any suggestions beyond what I've already tried please please help, it's starting to bug the bejeebus out of me!
This may also be of importance. The feedback is *less* noticeable when only the AVR or only the AMP is on. That being said, the AVR produces much more noise than the AMP when on by itself. The AMP's feedback seeems almost acceptable, but I still think it's rather noisy. Regardless, when both are on the feedback is much louder.
1st. I checked all speaker wires (bi amping to the 500s) to make sure they weren't running along power cables (which they weren't). I re-bridged the terminals and tried the cabling from *just* the AVR then from *just* the AMP and still heard the noise with no noticeable reduction.
2nd. I checked the interconnects between the AVR and the source: I checked the TV, TT, CD player, and the PC. I'm using throw away RCAs but I've ruled them out as the issue since the feedback occurs between all sources (unless I just need to get decent interconnects for all my connections).
3rd. I don't have a power conditioner but my roommate has a Monster HTS2600 so I moved that to my setup and plugged everything in. Still noisy!
Agh! What else could it be? The components are on a 3 shelf A/V rack and have a plenty of room to breathe... if it was just the AVR then why would more noise be produced when both the AVR and AMP are turned on? As I'm not very experienced with A/V equipment I'm kind of at a loss as where to go next... Any thought would be most appreciated. Thanks guys!