I personally have a BFD but only one subwoofer. I do know, however, of several folks who also have a BFD and 2 subs connected to it; since the BFD has 2 independent engines (for the right and left channel), they have DIFFERENT presets/filters for each sub in order to maximize the frequency response...
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Elite PRO-710HD - RPTV
Elite VSX-39TX - Receiver/Amp
Elite DV-37 - DVD Player
Elite M-10X - Back Surround Amp
BP2002TL - Main
C/L/R 2500 - Center
BPX - Surround
UIW64/A - Back Surround
PB12-Plus/2 - Subwoofer
DSP1124P - EQ (Subwoofer Only)