I read the whole thread related to your move from ep350 to ep500. Will try the suggestions on increasing the sub input level on the Denon to see if that helps. If not will have to look at alternative sub's, EP500, Hsu VTF2-MK3 (leading contender right now due to cost) or SVS PCi 20-39, SVS NSD / Plus lowend boxes.

-Deepak