High power 12” subwoofer Klippel® optimized Reinforced paper cone 3” copper voice coil High-Roll sandwich surround Diameter: 311 mm Mounting diameter: 288 mm Mounting depth: 166 mm Voice coil: 75 mm copper Power Handling: 800 W RMS Impedance: 2 x 2 Ohm SPL: 83 dB Xmax: 50mm Fs: 25.7 Hz Qts: 0.498 Vas: 31.2 L.