Mojo, not sure I'm with you on this one. Without dusting off my manual, I'm pretty sure if I turn my sub off, then the mains (80's) will be set to large obviously, and the bass below the crossover for the other speakers will be routed to the 80's. You do not want the center and Q's set to large. This is my opinion only, your kilometers may vary.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85