>>Did I clarify or make this worse?!?

That helps a lot... so the mains can be both a "source" and a "sink" for bass. You can set the speakers to "small" -- "strip the bass off the mains and send it somewhere" and also say "and by the way send all the stripped-off bass to the mains".

Cool. Can't do THAT on an HK

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8