Cadence Acoustics S2W12D4.V2 4 Ohm 1200W 12" Subwoofer Power handling: Peak: 1200 W / RMS: 600 W High Excursion Double Laminated Foam Surround for High Speed Bass Response Expanded and Rolled Steel Basket Magnet Motor Heat sink with Heat Pump Cooling Technology Aero Style Oversize Magnet Motor Vent