Lanzar OPTI1213D OptiDrive 12-Inch Die-Cast Aluminum Alloy Cone Dual Voice Coil 1.3 Ohm Subwoofer Power Handling: 1500 Watts RMS / 3000 Watts Peak - Massive High Density Foam Surround 3"" High Temperature Dual Voice Coil - 160 oz. x 2 High Density Barium Ferrite Magnet Impedance: Dual 4 Ohm Voice coil - Frequency Response: 30-1200 Hz Custom Tooled Die-Cast Aluminum Basket - Efficiency: 90dB Super Stiff Treated Pulp Ultra-Lite Cone - Includes: Installation Hardware and Template