This is a PowerBass S-104D high-performance 550 watt 10 inch car audio subwoofer. Featuring a dual 4-ohm, 2" inch voice-coils this S-Series subwoofer can pound out an amazing 550 watts total power (275 watts RMS). Also featured, are large pro-lock terminals. These terminals enable you to wire this powerful sub with large gauge cables into a 4 or 2 ohm load. The 4-layer wool/paper cone, high-roll treated foam surround, oversized 116 ounce motor assembly and stamped steel basket; allow this powerful subwoofer to produce more excursion without bottoming out and lower distortion. This equals deeper bass and higher SPL levels. This subwoofer is well-suited for small sealed or ported enclosures or other bass applications. You can use a mono amp, 2-channel or even a 4-channel amplifier to run this sub. Buy two and run a complete car/truck audio system!