High Performance Component Subwoofer 12 inch Single 4 ohm SD Series Subwoofer; Power Handling: Peak: 500 watts RMS: 175 watts; Impedance: 4 ohm; Polypropylene Cone; Black foam surround for high excursion; Stamped steel frame; Rubber magnet boot; 2 inch Voice Coil; Sensitivity: 88 dB; Frequency Response: 28-125 Hz