Right now I am experiencing this and have done a lot to get rid of the problem. I experience it when I have the volume up on all of my electronics such as DTV, PS3, and my Standalone Blu-ray player. I have bought an home theater Power Conditioner and that removed a lot of the noise but not all. The hum comes from the device that I am using. For instance, if I am watching a Blu-ray and disconnect that HDMI cable, the noise goes away.
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