Cant, they are in different areas of the room.

Talked to Scott again today for 30 minutes. HUGE HELP! The good news is it is NOT the amp. I unplugged the centre channel XLR cable and turned on the Marantz and the 7700 only, and no noise from the centre speaker.

So, I unplugged everything except the XLR cables and speaker wires. No noise. Thats good, I think. I then plugged in the outgoing HDMI cable from the Marantz to the TV. I get the hum. I then tried it in the HDMI out #2, still get the hum. So, it looks like either the cable, or someting connected to the TV.

Thats all I got done today. I hope its just the cable, even though that will require snaking a new cable thru walls. Easier than a repair on the amp I guess. More troubleshooting tomorrow.....
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Panasonic TC-P65S1 65" Plasma HDTV, Marantz AV 8801 Preamp, Outlaw 7700 Amp, Klipsch RF7 (X-over dean G modded) RC7 (X-over Dean G modded) RS7 CDT-5800C speakers, Outlaw LFM1 EX Subwoofer, Oppo BDP-93, B & O Turntable, Toshiba HD-A2, Sony CD & DVD 400 disc jukeboxes, DirecTV HD-DVR, PS2, PS3, Wii, Harmony one remote, Monster PowerBar 1200 for the TV, sub, PS3, HD DVD and Wii, Tripp Lite Isolation Bar for the Amp, Pre-Amp and other sources.