For me, I don't think using the 2-ch L&R is an option. If I go that route and I plug it into, say, CD-IN on my receiver, the receiver will do an additional A/D and D/A conversion on it unless I run it in "direct" mode (which would eliminate my sub woofer).
Using the 5.1 outputs on the Denon and having "bass enhancer" on, I can get 2-channel + subwoofer without my receiver digitizing the signal (right?).
At least I don't think my receiver A/D's the multi-channel inputs. Does anyone know? It's an Onkyo TX DS676.
Basically, I want to have 2-channel include the sub because it's better than my main speaker's bass output. I thought this would be the best way to do it.