RCF 18" Speaker, 900W, 98dB, 30-1000Hz, X-max 8.5mm, weight 13kg The LF18G401 is an 18-inch woofer designed for high power handling and linear frequency response. It features a fiber-loaded cone assembly and a high excursion triple roll surround, allowing for a 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 ohm - 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 ohm - 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: 4.8ohm - 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 - Effective 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