BLASTKING ROCKET18 18-inch Woofer 8-Ohms 1600-Watts RMS 3200-Watts Peak Fiver Cone 4.5-inch Voice Coil , 96.8 dB Sensitivity , 38 Hz - 1800 Hz Frequency Response || FEATURES|| 4.5-inch Voice Coil || 1600 Watts Rated Power Handling || 3200 Watts Program Power || 96.8 dB sensitivity || 38 Hz - 1800 Hz frequency response || Carbon Fiber Cone || || || SPECIFICATIONS || Nominal Basket Diameter : 457 mm / 18 inch || Rated Impedance : 8 ohm || Rated Power Handling : 1600 Watts || Program Power : 3200 Watts || Sensitivity : 96.8 dB || Frequency Range : 38 hz - 1800 hz || Magnet : 150 Oz / 250x140x25 mm / 9.8x5.5x1 inch || Top Plate Thickness : 15 mm / 0.59 inch || Cone Material : Carbon Fiber || Minimum Impedance : 5.1 ohm || Voice Coil Diameter : 115 mm / 4.5 inch || Voice Coil Material : Fiberglass || Voice Coil Length : 25 mm / 1 inch || Number of Layers : 2 || Kind of Layers : inside/outside || Top Plate Thickness : 15 mm / 0.59 inch || Cone Material : Carbon Fiber || || THIELE – SMALL PARAMETERS || Resonance Frequency fs : 38 hz || DC Resistence Re : 6.8 ohm || Mechanical Factor Qms : 3.3 || Electrical Factor Qes : 0.45 || Total Factor Qts : 0.35 || BL Factor BL : 26 T – m || Effective Moving Mass Mms : 196 gr || Equivalent Cas Air Load Vas : 243 liters || Effective Piston Area Sd : 0.123 M² || Maximum Linear Excursion Xmax : 9 mm || Half-Space Efficency Eff : 2.2 % || || || MOUNTING INFORMATION || Overall Diameter : 464 mm / 18.26 inch || Bolt Circle Diameter : 440-447 mm / 17.3-17.6 inch || Bolt Hole Diameter : 6.5 mm / 0.25 inch || Front Mount Baffle Cut-Out : 425 mm / 16.7 inch || Rear Mount Baffle Cut-Out : 425 mm / 16.7 inch || Depth : 201 mm / 7.9 inch || || PHYSICAL INFORMATION || Net Weight : 17.5 Kg / 38.6 Lbs || Shipping Weight : 18.8 Kg / 41.4 Lbs || Dimension (WxDXH) : 510x510x280 mm / 20x20x11 inch ||