The TS-W310D4 10 In. Subwoofer with Dual 4 Ohm Voice Coils (1400 Watts) features a combined IMPP cone, which makes the body ultra-rigid yet lightweight, giving you low distortion and powerful bass at high sound press levels. The dual-layer elastic polymer surround dramatically improves durability and lightness for superior response, especially for louder volume.Extra-tough suspension for high durability to withstand high input power4-Layer Copper voice coil with aluminum former for improved heat dissipationSubwoofer design allows for flexible in-car installation in a box or in a free-air type applicationFrequency response 20 Hz to 250 HzSensitivity (1 W/1 m) 95 dBHeightWidthDepthWeightColorOperating SystemBatteries IncludedBatteries RequiredNumber of BatteriesBattery TypeLanguage English, Spanish, FrenchAssembly Required