(2) Skar Audio IX-12 D4 12" 500W Max Power Dual 4 Subwoofer Sold as a Package - Includes 2 IX-12 D4 12-Inch Dual 4 Ohm Component Subwoofers Peak Power : 500 Watts RMS Power : 250 Watts 2" BASV High Temperature Copper Voice Coil Advanced Air Flow Cooling System