well, with the help of tech support, i was able to narrow it down to the cable box. Now I am really in a pickle. disconnect the coaxial cable and the hum is gone as just a nice peaceful very soft hiss is present.
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Outlaw 990 PreAmp
Outlaw 7500 5 Channel Amp
Two Outlaw 2200 M-Block Amps - for the Surrounds
Oppo OPPO DV-981
Polk LSi15 Fronts
Polk LSiC Center
Polk LSi9 Surrounds
SVS PC-Plus 20-39 (newest addition down to 16hz) Subwoofer
Sony KDF-50WE655 50" LCD