Pioneer TS-SWX310 12-Inch Shallow Series Preloaded Enclosure Ultra-slim subwoofer enclosure loaded with 12-inch TS-SW301 subwoofer Reinforced MDF construction with black carpet finish and embroidered Pioneer logo 1000 Watts maximum (250 nominal) power handling 30 Hz to 1500 Hz frequency response with 91 dB sensitivity. 4-ohm single voice coil design. This item is non returnable.