Remove the 3 prong to 2 prong adapters and do that? I probably could as a temporary fix to see if it kills the buzz. Doing so as a long term solution would be very difficult as they are not near each other. The amp, pre, DVR, Oppo, and the CD and DVD jukeboxes are in a wooden stereo cabinet about 15 feet away and on a perpindicular wall to the TV, PS3, Wii and HD DVD player.
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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.