1st and foremost: PA subs are not meant to be used in the home. They are PA subs. The difference is: PA subs are about volume in an extremely large area, not about super low output. Think of it this way, If you have a dance club, most likely bass doesn't dip much below 40hz. In a home theater you will most likely have material in the 18Hz-25Hz range.
You should change your search to consumer/audiophile type sub-woofers. Check out HSU,SVS,Velodyne, Elemental Designs, PSB, Paradigm... the list and selection out there is impressive.