You could use the 2160s amp to power your mains by putting the output of your L/R channels from your AVR to the amp inputs on the 2160. Seems like a huge waste of the 2160s circuitry since it will no longer be in the loop for any audio. How to trigger the 2160 with the rest of your system will be a challenge unless you power it all through a common power supply that you can just switch on. You will still have to power on the 2160 separately to get the amp to function. You would be better buying a 5 channel amp like the 5000 to make it all work.