Matrix Audio Matrix 1400 Watt Dvc 12 Inch Subwoofer High Quality Poly Mica Coated Paper Cone Oversize Line Stitched Butyl Rubber Surround Dual 2 High Temperature Aluminum Voice Coils 1400 Watts MAX / 700 Watts RMS 100 oz. Magnet / 200 oz. Magnet Structure Customized Magnet Rubber Boot Chrome Plated Vented Magnet Structure Top Grade Composite Spider Impedance: 4 OHM Efficiency: 92dB (1 Watt / 1 Meter) Frequency Response: 25Hz - 1.5KHz