Pioneer TS-W308D4 12-Inch D4 Regular Core Subwoofer 12-inch Champion Series subwoofer with 1400 Watts maximum (400 nominal) power handling Basalt/carbon fiber reinforced IMPP cone with fiber-woven radial surround Dual 4-ohm voice coil for 2 or 8 ohm operation 20 Hz to 180 Hz frequency response with 90 dB sensitivity 153 millimeter mounting depth