Alphasonik PSW912, 30cm (12") Alpha 900 Series Subwoofer, 2200W RMS 2200W RMS, 4400W MAX, impedance: Dual 2 Ohm frequency response: 45Hz - 900Hz 200oz. Magnet, sensivity: 93dB @ 1w/1m Aluminium machine cut basket ultra Light 2-layer Carbon Fiber 76mm Voice coil, 10mm Lug-Lock, Input and Output Terminals