The Sound Ordnance B-8PTD. It’s an 8″ sub that is built into a nice sturdy enclosure. It has a flatter shape and it conveniently fits right under the seat. The install is quite easy; the front passenger seat was removed for easy access to the new subwoofer location. There will be several connections to the subwoofer: one from a grounded location on the frame, one from the head unit, and another from the positive terminal of the battery. There are also connections for RCA cables for the subwoofer to plug into the radio or head unit.