Cadence Acoustics S0W12-S4 500 Watt Peak 12-Inch Single Voice Coil 4 Ohm SQ Subwoofer RMS Power: 250 Watts/PEAK Power: 500 Watts Frequency Response: 28Hz - 1 kHz Sensitivity: 93dB System Impedance: SVC 4 Ohms Mounting Depth: 5.2 inches