I previously had a Denon AVR-X4200W and, with a 7.1.2 system, I needed an external amp to power it all so I purchased the Onkyo M-5010 to power the overhead speakers. I've since upgraded to the Marantz SR6012 with enough power to process all 9 speaker channels. I'm not sure what the SR6012 offers per channel with all channels driven. I do know that the Onkyo amp specifies 75 W/Ch (8 Ohms, 1 kHz, 0.08% THD, 2 Channels Driven, FTC). Should I use this amp in my current setup or just sell it?