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Could a BFD fix that huge dip around 56hz?
Nope, absolutely not. Dips like this are caused by phase cancellations, where the sound reaching the measurement point is a combination of an original direct soundwave and a reflected sound that is 180 degrees out of phase at the dip (one half wavelength).

All your trouble spots are around the crossover. Phase and distance can usually solve these. You must first measure the sub alone and find the best position for it that creates the smoothest response. Then you need to measure the mains alone to see how they look and adjust positioning if there's any cancellation or addition that appears bad. Then you measure the sub + mains and adjust the phase and distance of the sub to obtain the smoothest response.

brucek
 
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