Skar Audio DDX-12 D4 12" 1500 Watt Max Power Dual 4 Ohm Car Subwoofer 12-inch Dual 4 Ohm Competition Grade Car Subwoofer Peak Power: 1,500 Watts | RMS Power: 1,000 Watts Massive Double Stack Magnet & High Temperature 2.5" Copper Voice Coil Competition Grade Paper Cone and High Roll Foam Surround Advanced Air Flow Cooling Design | Fs: 39.0 Hz, Sensitivity (SPL): 87.7 dB