Cadence Acoustics S2W8-S4 1000 Watt Peak 8-Inch Single Voice Coil 4 Ohm Subwoofer RMS Power: 500 Watts/Peak Power: 1000 Watts Frequency Response: 20Hz - 500Hz Sensitivity: 92dB System Impedance: SVC 4 Ohms Mounting Depth: 5.20 inches