Profile: Subthump specializes in offering car and truck enclosures. We provide blowout sub boxes, car audio products and subwoofer enclosures. Our car audio products include amplifiers, subwoofers, speakers, source units, sub & amp packages and installation accessories. Our dual 4ohm subwoofer includes Inverted structural dome polymineral injection molded cone, sleeved high-power tinsel lead wires and high-temp polyimide film voice coil former.