I can't speak for the Denon unit, but my Classe SSP75 definitely crosses over bass to the sub when the mains are set to small. I thought this was wrong, but when I tried it, I discovered that I liked the system better with the sub. The sub's bass is much tighter than the main speakers, for whatever reason. This is with MartinLogan Odyssey mains and a Descent subwoofer.
Bass Management ?
I have a Denon 5800 avr that I use as a processor only. I have it mated to a Sunfire Cinema Grand Sig. I understand that when I set all speakers to small the info. under 80 hz(being a THX certified piece) goes to the sub. My question is what about analog LPs and other music sources does the crossover point remain the same or whats the deal. If you had Dunlavy SCIVa as main Def. Tech 3000 as center and Def Tech BPX for surrounds how would you set your bass management?