Have you tried any of the clean power products from Monster. I had a slight hum, but upon hooking up a monster reference power center hts3500, the hum is gone.
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Family room
Outlaw 990/7125
Klipsch RF-25's, Klipsch RC-25, Klipsch RS-25, Klipsch RS-52's

Home theater
990/7125 - Until the 978 is released
Seymour Av xd 120" screen
panasonic pt-ae7000u
3 In cabinet Axiom M80's, 4 Qs8's, In cabinet EP-800 subwoofer