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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.


The only thing to add is that when the switch is off all speakers get a full range signal AND the sub gets a copy of the signal from all speakers below 80Hz. That's the double bass. You can avoid it by keeping the switch on, but some would rather not do that.


brianca..