I also have buzzing MA252.... Speakers emit 60Hz buzz even when volume is set to 0%.
Moving volume to 100% just adds extra low "Shhh", but the buzz is still there...
I have Panamax M5300 to filter AC noise and Emotiva CMX-2 to block possible DC.. Still buzz... Not very loud, you have to be within 1-2 feet from speakers to hear it, but it is there..always...
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