Pioneer TS-SW3001S4 12-Inch Shallow Step Up S4 Subwoofer (Discontinued by Manufacturer) 12-inch Shallow Series subwoofer with 1500 Watts maximum (400 nominal) power handling Basalt/carbon fiber reinforced IMPP cone with fiber-woven radial surround 4-ohm single voice coil design 20 Hz to 230 Hz frequency response with 93 dB sensitivity 3-1/4-inch mounting depth