I currently have a Denon 3806 AVR with a 7500 amp and all Polk Lsi speakers (5 channel). Would I see a significant change in the quality of sound if I dropped the AVR and bought a 990? What features would I be losing? I am extremely pleased with the amp and Outlaw in general and am wondering if the switch would be worthwhile. I am not suffering right now,the sound is good. Thanks for the help o knowledgeable ones.