I built my own 142l sub and have a pretty nice room curve dialed in. Ever since adding the BFD I noticed my sub tends to bottom out more than before. I assume this is because I tamed a +12db hump from 50-60hz, so when calibrated with my mains the sub is producing more sub 50hz material than before. The LFE line level is setup so I only get very brief glimpses of the red led on the BFD when playing bass heavy material like U571 and Fight Club (Psycho Boy and Operation Latte). I was wondering that since the BFD soft clips I could raise the line level so that instead of the driver bottoming out the BFD clips and the driver gets no signal.