Another comparison between similar receivers at [url=http://www.avsforum.com/t/1334415/marantz-sr5006-marantz-sr6006-receiver-thread/120]avsforum. Post #102.
"In the room the Marantz sounded best - much better imaging an staging, warmer/fuller sound, just crisper and it sounded like I was in that big amphitheater IMHO. The Denon sounded thin and the staging/imaging wasn't nearly as good. The Onkyo was better than the Denon but not as good as the Marantz. The Onkyo had a bit better mid/lower frequency but with my big front mains and boomy sub I am just fine with the lower frequency."
Now, I know this may have been due to some setup feature that the installer happened to turn on in the Magnolia HT room.