Makes a "buzzing sound"? I presume that it is an active sub? if so, you may be experiencing a "earth loop hum". ensure that your subwoofer is plugged in to the same power point as the rest of your system. If you want to be absolutely sure that this is not the problem, then you can run an "audio isolator" to isolate the audio earth from the mains earth. Just an option to think about.
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