gene3x...……………..
With those Power Guard lights flashing, that amp is putting out somewhere around 750-800 watts RMS as the MC501 has 2DB of headroom. I am surprised you didn't blow your eardrums out. I run an MC152 with GE Triton Ref speakers and with the meters at -3db and no power guard lights on, I am getting 108db SPL and it is waaaaay too loud! You must have a huge room.