Quantum QBW12D4 Beta Series 12-Inch 4 Ohms DVC Subwoofer 12-Inch 4 Ohms DVC Subwoofer with 2 inch 4 layer Dual 4 ohms VC w/Aluminum former Vac PP cone with Polyether foam surround, Vac PP domedust cap 47.5 oz magnet, Stamped Steel Frame Black Electro-plated finished Top, Bottom Plate and yokes P/C spider, Spring Terminals Spring Terminals, EVA Gasket and max power 1500 watts with Rms power 375 watts