DS18 BD-G12D Black Diamond 12-Inch 1,800 Watts Dual Voice Coil Subwoofer 1,800 Watts of Maximum Power 12-Inch Dual Voice Coil Subwoofer Impedance of Either 2 or 4 Ohms 50 Ounce Magnet, Non-Pressed Paper Woofer 88 Decibels of Sensitivity Frequency: 30-1,500 HZ