Pioneer TS-SW2501S4 10-Inch Step Up Shallow S4 Subwoofer 10-inch Shallow Series subwoofer with 1200 Watts maximum (300 nominal) power handling Basalt/carbon fiber reinforced IMPP cone with fiber-woven radial surround 4-ohm single voice coil design 20 Hz to 290 Hz frequency response with 90 dB sensitivity/3-inch mounting depth Special Shipping Information: This item cannot be returned to Amazon.com. For additional information concerning this policy, please visit our Product Specific Returns Policy Page