Ground issue. Try lifting the ground on the quads or tv.
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Easy enough to try Swampwalker idea. Go and unplug your cable CATV From the wall outlet and don't forget to unplug cable in other rooms as well. If your buzz goes away you need a ground breaker for your cable. If not go back to your system, you might want to try pluging the Quads into another outlet as other things plug in on the same line can sometimes cause this. Do you have dedicated lines?