Matrix 1200 watt 12 in subwoofer 2" High temperature Kapton voice coils, 1000 watts max/500 watts RMS. High quality poly injection core, Foam Surround. 50 oz magnet, Concealed magnet, Impedance: 4 OHM. Efficiency: 90dB, Frequency response: 35Hz - 2KHz. Mounting Depth: 3-1/2".