Pioneer TS-W258D4 10-Inch D4 Regular Core Subwoofer 10-inch Champion Series subwoofer with 1200 Watts maximum (350 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 450 Hz frequency response with 90 dB sensitivity 143 millimeter mounting depth