Cadence Acoustics S1W12-D4 900 Watt Peak 12-Inch Dual Voice Coil 4 Ohm Subwoofer RMS Power: 450 Watts/PEAK Power: 900 Watts Frequency Response: 26Hz - 750Hz Sensitivity: 94dB System Impedance: DVC 4 Ohms Mounting Depth: 5.71 inches