Thanks for the reply, blaineh. Seems like a good approach. It can be easily adapted to my (passive biamp) configuration.

From what I understand, the L/R + LFE setting only controls what goes to the sub, not what goes to the L/R.

May I ask what xover are you using for the active biamping? I'm hoping to borrow an active xover to experiment with active biamping of the 1.5s.

-Brent