Mike, Why do you think negative #'s equal louder volume? From my experience +5dB has always been louder than -5dB. It will make the bass sound lower in volume but not louder
THe driver has reached its mechanical limits. It can only move in and out so far and if push to hard at a low frequency it will bottom out. As for no Bass present, welcome to HT! If you were like me you came from gobs amount of bass and calibrated your HT sub and played music and the bass was...