The double bass issue had to do with the low signal from the mains being played by both the sub AND the mains, IIRC. Also IIRC, that was mostly with the multichannel analog input.

If the sub is playing the LFE info plus what was originally recorded for the mains and the mains are not playing that info, there is no double bass. The sub would be playing info from more than one channel, BUT the info from a single input channel would not be reproduced by more than one speaker.

Does that make sense to anyone?



If the mains are still playing the same signal then that would be double bass. If that signal has been filtered from the mains then that would not be double bass.