I have to agree with Ken, it is time for some serious power. I have yet to run my 3808 for any length of time, a song or two, above -10 and this is really loud(~95-100db depending on the cd, IIRC) in my room. Your room size and what you are trying to achieve I feel are beyond the Denon's capabilities.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70