Planet Audio PX12 AXIS 12 inch Single Voice Coil (4 Ohm) 1000 Watt Car Subwoofer Resonant Frequency 35 Hz, Sensitivity SPL (1W / 1m) 95 dB Polypropylene Cone, 2 Inch Copper Voice Coil, Rubber Surround Sealed Enclosure Internal Volume: 1 Cubic Feet, Ported Enclosure Internal Volume: 1.2 Cubic Feet 3 Inch Round Port Circumference, 7.5 Inch Port Length, 40 Hz Port Frequency 4 Inch Mounting Depth, 11.1 Inch Mounting Hole Diameter Dimensions: Depth 13 x Width 13 x Height 4.5 3 Year Platinum Online Dealer Warranty valid only on products Sold / Shipped by Amazon.com. This offer is not valid on purchases made from third party market place sellers