…just remember when you set the Sub to LFE+Mains and speakers large, the Sub gets anything around the crossover point and lower, while the M80s get everything. Once the speaker setting is moved to small, the LFE+mains feature is not required as the Denon will automatically bypass this setting and do a rolled off crossover point on the mains(actually all speakers set to small work this way) and send the rest to the sub.
That’s how the Denon 2807 works.
LFE+MAIN:
Low frequencies from speaker channels that have been set to “Large” are reproduced from those speakers as well as from the subwoofer(s).
I verified this a while back with an SPL meter and it does follow the crossover settings for those speakers. This topic came up a while ago when I posted this:
http://www.axiomaudio.com/boards/ubbthre...true#Post207514However, vassillios the suggestions to follow the standard of setting all speakers to small with a crossover of 80Hz is a good starting point. Then as jakewash suggest play around with it to see if you like something different.