Using the Avia setup disc, which I believe is in DD, the Denon 2900 does not redirect the LFE to the mains if the mains are set to Large and the sub set to No. I think it's probably the same for DTS sources.

Dale, use the channel identification track you have on the Chesky disc. Keep your setup the way it is and, if the player is redirecting the LFE to the mains, you'll here the guy announce [RADIO COMMERCIAL VOICE]This is the subwoofer channel[/RADIO COMMERCIAL VOICE] through your main speakers. Try it in DVD-A and DVD-V (DD) if your player will allow you to play it both ways.

If it doesn't work, try hooking up your sub to the 950 and turning it on in the player, then set all your speakers to large in the player and let the 950's analog BM take care of the rest. See if you notice, like or dislike the difference.