Btw, this anomaly has also been confirmed by Audioholics:
http://www.audioholics.com/reviews/receivers/denon-avr-5805/surround-processing-and-bass-management"A few notes about bass management logic for the AVR-5805
* If you set Mains Small, all other speakers default to Small
* If you set any speaker to Large, the bass will not go to the subwoofer, except if you select "LFE + Main ". * If "LFE + THX" is selected then bass from the Mains will not be directed to the subwoofer if the Mains are set Large, even in 2CH mode.
* The AVR-5805 has completely independent bass management settings (ie. crossover, distance compensation, level, etc) for 2CH mode. Not since the days of the Aragon Soundstage have we seen this sort of flexibility, especially in a receiver!"
