BAZOOKA BT1224DVC BT SERIES DUAL PASSIVE TUBE 12 4_ Features: Foam surround Paper cone with polypropylene dust cap Fits in all vehicles Home audio sound quality for your vehicle Jet black paint finish Upgrades any 12 volt system Perfect for leased vehicles Dual voice coil 36oz. Magnet Type: Subwoofer Sensitivity: 106 dB Frequency Response: 30 - 1000 Hz Impedance: 4 ohms