Big motor, more power. The philosophy of engines and the philosophy of the Autotask Woofer or ATW are the same. A bigger motor the magnet and voice coil former means more bass power can be pushed through from bigger amplifiers. Additional bass engine power comes from the reinforced cone and rubber surround. The ATW Series 12″ 700-Watt DVC Subwoofer features a PVC gasket, Thermopolis dust cap, rigid polypropylene cone, black foam surround, 2″ voice coil, nickel-plated terminals, vented motor and a blue cotton spider.