Pyramid PW1055USX 10-Inch 500 Watt Subwoofer Poly-Coated Paper Cone - Heavy Magnt Structure - SPL @ 1W/1M: 86.3dB Non Fatiguing Rubber Suspension - 4 Ohm Impedance - Magnet Weight: 60 oz. Stamped Steel Basket w/Golden Terminal - Impedance: 4 Ohm - Mounting Depth: 4.21'' Bumped & Vented Motor Structure - 250 Watts RMS/500 Watts Peak 2'' High Temperature Kapton Voice Coil - Overall Diameter: 10.20''