DB DRIVE K712D4 Okur K7 Series Subwoofer (12-Inch) Non-Transfer Paper Cone with Rubber Surround Vac PP Dome 140 oz. Ferrite Magnet Black Electro-plated Top and Bottom Plates Die Cast Aluminum Frame 1800W max power 900W nominal power Dual 4 imp 2.5-Inch voice coil 4 layer DVC with aluminum former