Here is what I have figured from the manual and the other double bass thread (which I can't find right now). For all inputs but the 6 channel input, there are two speaker sizes, large and small. When speakers are set to small, everything below the crossover is sent to the sub. When speakers are set to large, no bass is redirected from them. They receive the full signal whether there is a sub or not. The sub will receive th ".1" and anything below the crossover from the small speakers. If there is no sub, all of this bass that would have gone to the sub will now go to the mains.

The 6 channel input works differently. This works independently of the other bass management! The crossover is set to 80 hz, it can not be changed, only turned on or off. When it is off, all speakers will receive the full signal whether they are marked large or small in the other bass management. When it is on, all signals below 80 hz will be sent to the subwoofer. This next statement is speculation, but if you do not have a subwoofer, I believe the signals below 80 hz will be dropped. The switch basically decides whether all speakers are to be treated large or all speakers are to be treated small.

Like Charlie said before, there is no double bass. If you have double bass, you really have some funky splits and connections in your wiring. If I missed anything, or misunderstood anything, please let me know.

[This message has been edited by JT Clark (edited November 08, 2002).]