Yes. I'm only running a 5.1 setup, so I chose the 5.1 bi-amped + zone 2. I think it was initially set to 7.1 + zone 2. Like I said, I don't know why it would have eq'd the output of that channel, so maybe there's a legitimate issue with the avr. As a test, I'll bi-amp them again and re-run the Audyssey and see if that L rear surround output still sounds off or if that fixes it. Interesting that you found it more dynamic without bi-amping, I wonder why that would be? To be honest, after doing a little research I couldn't really find much to support the practice - at least in the fashion that I was doing. Common sense-wise it seems like you should have more available clean power to the mains if you're using 4 amps instead of 2, but in practice there didn't seem to be much evidence to support that idea. If it's not really advantageous, why do high end speakers come with the capability, and why do receivers offer the option as well? Maybe the speaker wire and banana plug industries paid them off to push the idea, lol.