NEW ALPHASONIK PSW412 12" 1000 WATT DVC CAR SUBWOOFER 12" (30cm) Alpha 400 Series Subwoofer 500W RMS, 1000W MAX, impedance: Dual 4 Ohm frequency response: 25Hz - 500Hz 46oz. Magnet, sensivity: 91dB @ 1w/1m chrome cut basket