If you unplug the main AC cord for a few minutes and then plug it back in does the occasional rumbling (like thunder off in the distance) go away? If so, how long does it go away. If many days/wks, then sounds like the same problem others including me have had in the past. For some reason the amp stores up a charge and unplugging it releases it, did they send you a refurbed amp?

People just forget about MarkSJohnson's movie production at my place.


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