BOSS Audio P80DVC 1000 Watt, 8 Inch, Dual 4 Ohm Voice Coil Car Subwoofer Sensitivity SPL (1W / 1m) 88 dB, Resonant Frequency 42 Hz Paper Treated Cone, 2 Inch Aluminum Voice Coil, Foam Surround Sealed Enclosure Internal Volume: .5 Cubic Feet, Ported Enclosure Internal Volume: .8 Cubic Feet 3 Inch Round Inch Port Circumference, 8 Inch Port Length, 45 Hz Port Frequency 3.8 Inch Mounting Height, 7 Inch Mounting Hole Diameter Dimensions: Depth 8.3 x Width 8.3 x Height 4.3 3 Year Platinum Online Dealer Warranty