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The LF18G401 is a 18-inch woofer with linear frequency response cheracteristics and very high power handling. The LF18G401 uses a fibre loaded cone assembly along with a high excursion triple roll, constant geometry surround. This combination provides remarkable strength and peak to peak maximum excursion of 50mm. Features 4-inch, fiberglass inside/outside copper voice coil 1800W continuous program power handling 98 dB Sensitivity 30 Hz – 1 kHz Frequency range Dual spider design with silicon based dampening control Triple-roll surround and corrugated straight cone geometry General Specifications Nominal Diameter: 460 / 18 mm/inch Rated Impedance: 8 Ω Program Power: 1800 W AES Power handling capacity: 900 W AES Sensitivity: 98 dB Frequency Range: 30 Hz ÷ 1000 Hz Effective Piston Diameter: 395 / 15.6 mm/inch Max Excursion Before Damage (peak to peak): 50 / 2.0 mm/inch Minimum Impedance: 5.9 Ω Voice Coil Diameter: 100 / 4 mm/inch Voice Coil Material: Copper Voice Coil Winding Depth: 23 / 0.9 mm/inch Number of layers: 2 Kind of layer: inside / outside Top Plate Thickness: 12 / 0.5 mm/inch Cone Material: No pressed pulp Cone Design: Straight Surround Material: Polycotton Surround Design: Triple roll Thiele/Small Parameters DC resistance: 4.8Ω Mechanical factor: 7.6 Electrical factor: 0.30 Total factor: 0.29 BL Factor: 24.6 T · m Effective Moving Mass: 182 g Equivalent Cas air load: 268 liters Effettive piston area: 0.122 m² Max. linear excursion (mathematical): 8.5 mm Voice - coil inductance @ 1kHz: 2.4 mH Half-space efficiency: 3.09% Mounting information Overall Diameter: 465 / 18.3 mm/inch Bolt Circle Diameter: 442-447 / 17.4-17.6 mm/inch Bolt Hole Diameter: 6.5 / 0.3 mm/inch Front Mount Baffle Cut-out: 424 / 16.7 mm/inch Rear Mount Baffle Cut-out: 424 / 16.7 mm/inch Depth: 205 / 8.1 mm/inch Volume occupied by the driver: 7.0 / 0.25 liters/ft³ Net Weight: 13 / 28.9 kg/lbs Shipping information Shipping weight: 13.7 / 30.4 kg/lbs