Audiobahn 10-Inch Dual 4 ohm High Excursion Series Car Subwoofer (AW1000J) 10 inch High Excursion Series Subwoofer Power Handling RMS: 600 watts Impedance: Dual 4 Ohm High gloss high-strength carbon composite cone with laminated pulp reinforcement Tall narrow foam surround increases cone surface area which means more air displacement