Planet Audio BB104D Big Bang 10 inch DUAL Voice Coil (4 Ohm) 1800 Watt Car Subwoofer Resonant Frequency 41 Hz, Sensitivity SPL (1W/1m) 83 dB Polypropylene Cone, 2.5 Inch Copper Voice Coil, Foam Surround Sealed Enclosure Internal Volume: .6 Cubic Feet, Ported Enclosure Internal Volume: 1.1 Cubic Feet Dimensions: Depth 10.5 x Width 10.5 x Height 6.5 3 Year Platinum Online Dealer Warranty