The final test is to unplug your Cable TV cable from the wall. One other test to eliminate your receiver or processor is to see if the hum changes based on what input you have selected (DVD player, Cable TV, etc.) Does the hum change or go away when selecting a different input? No? Then your problem is occurring at a later stage in the system (most likely a ground loop caused by the addition of an amplifier or powered subwoofer with a 3-prong power cable.) unplugging the cable from the wall to see if the Cable TV is the source of a ground loop.)
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