Audiobahn 12-Inch Dual 4 ohm Natural Sound Series Car Subwoofer (AW1251J) 12 inch Natural Sound Series Subwoofer Power Handling: RMS: 400 watts Impedance: Dual 4 ohm KM3 coated, nonpressed paper cone is lightweight and efficient for a true-to-life sound J-type narrow foam surround gives the woofer more cone surface area and more efficiency