Also, what did the denon set the sub channel level to with ep800 set to 50%? Goal is to have t set close to 0. "Crossover" at 150 on sub is appropriate, then set crossover for all speakers through denon to desired level. If you ran audyssey then I suggest reporting back what crossover values were selected for each speaker.

By the way, I wish I had an ep800!

-David