Hello....new to this forum
I own 2 LFM-1 and 1 Def Tech PF15TL...so 3 subs total in the room.
I just added a BFD and it works great...used it to get rid of a big hump at 42hz....seemed to smooth the subs out well. For the cost of the BFD ($100.00), I would recommend it to everyone.

Any questions ..feel free to send them to me or catch me on AIM

Later
RayJr