I recently upgraded from a cheap DE series Sony receiver to the Denon 3801. The Denon is definitely a challenge to set up and the interface leaves much to be desired, particularly the necessity of having to have video out from the receiver to the TV in order to be able to change any settings. Assenine. Now here is the interesting part. I didn't think there would be any difference in sound. And for the most part, I can't really say the "sound quality" has changed for HT purposes, e.g. that it sounds warmer, clearer, etc. However, from the moment I plugged it in, I noticed 2 rather dramatic differences. First, the rear/surround soundstage is MUCH wider and better articulated (I still am using a 5.1 system, so no additional speakers). I checked to make sure I didn't just have the surround level set higher, but I didn't. I actually had the Sony set to +2db's for the rears, and the Denon is set at 0. But the rear soundstage is vastly improved, almost as big a difference as when I went from DPL to DD a couple years back. Is that the Denon vs. Sony doing that? Second, and even more surprising, my Sony SA-Wm40 subwoofer seems to be less boomy and muddy with the Denon. The base is still powerful, but it is more controlled. Could that also be caused by the upgrade to the Denon, or am I experiencing auditory hallucinations?