I just tried only running the front L and R from the Basx A500 and the rest of the 7.1.4 from the AVR, it actually sound better, like a more 'full' sound compared to running LCR and surround backs off the A-500. Surround effect was more immersive and there was more bass. AVR did run hotter though. I know at 2 channels, the A-500 is 110 Charlie watts per channel, and with 5channels its 80 charlie watts per channel, but I would have thought running 5 off the A-500 would be better since its relieving load on the AVR and leaving more chatlie watts available for each channel?