I just replaced my Denon 2808 with a 4520. I am running a 5.1 speaker setup with 2 subs. I have watched several movies already and they sound really great, I can defiantly tell a difference from the 2808. The other night I put my Led Zeppelin Blue Ray concert DVD in and was disappointed. I haven't tried changing anything yet but it sounds harsher then when I had the 2808 going. The best I can explain is the front left and right speakers are overbearing, and I don't seem to have the low punch that I had before.