Yep, that was what I was getting at.
But, the rub is that the mains would be full range when using EXT-IN (is that correct?), and if so, then you may need to use a different program in the BFD for music and HT.
The HT program filters would be set up with the mains utilizing full bass management, but the music program filters might have to account for the different natural full range roll off of the mains. No big deal to have two programs in the BFD though (if it's needed).
brucek