Unless you plan on using the amp in your shower just buck the ground off . Hell my new yamaha reciever came with no ground on the plug. It could also be a polarity problem , house wired incorrectly. Also change out the rca cables, i had a set i used from my kids car that were not that old and they were making my sub hum.
DOG is GOD spelled backwards.
I blame my terseness on my keyboard. smile
M80 V3 MY GLOSS Cherry