I've still got this problem and it's really becoming annoying for me...re-routed power cables, switched to new interconnect cables from 970 to 7500 (Outlaw PCA's), new interconnects from BD player to 970, new speaker cables...no improvement. I'm thinking the origin is at a high frequency (I only hear it from the tweeters). Any suggestions?
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HT:
Pioneer VSX-1120
Salk Songbirds, SongCenter, SongSurrounds
Panasonic BDP-45
Outlaw LFM-2

2 Channel:
Red Dragon M-500 monoblocks
BAT-VK3i
Salk HT-1TL's
Apple TV
Beresford 7520 DAC
Surgex XS10