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I've tried (3) different HDMI Switches, all with "auto switching"; and, they all really dislike HDMI. In my case, I'd select Input #3, and any time the airconditioning kicked on, it would switch back to Input #1. One significant issue is that the sources (Samsung BD-P1500 and DirecTV H-21...

You may be experiencing "ground loop hums". I have a customer where I installed a home theater system and all the key components are hooked to the $1600 amp with HDMI (Blu-Ray/DirecTV). Yet, I'm getting hum in the speakers. When I disconnect the two coaxes feeding the HR21 DirecTV Receiver...