Xenon Man, I have disconnected the HDMI to the plasma. If one HDMI cable is connected from 1 source, the buzz is very faint. If the only HDMI cable is connected to the plasma, its very faint. If I add a second (in or out) the buzz increases. If I add a 3rd (in or out) regardless if its input 1-5, the buzz gets louder (annoyingly so).
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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.