Speaker 18" 700W, 99.5dB, 38-1000Hz The L18S801 is RCF's classic high-efficiency 18" woofer. A precise combination of voice coil length, moving mass weight, and suspension control makes this transducer the top choice for many speaker manufacturers and rental companies. The voice coil construction, suspension, and cone materials have been upgraded to handle up to 700 watts RMS power. Features: - 4-inch fiberglass inside/outside copper voice coil - 1400W continuous program power handling - 99.5 dB Sensitivity - 38 Hz – 1 kHz Frequency range - Dual spider design with silicon-based dampening control - M-roll surround and exponential cone geometry General Specifications: - Nominal Diameter: 460 / 18 mm/inch - Rated Impedance: 8 ohm - Program Power: 1400 W AES - Power handling capacity: 700 W AES - Sensitivity: 99.5 dB - Frequency Range: 38 Hz ÷ 1000 Hz - Effective Piston Diameter: 380 / 15 mm/inch - Max Excursion Before Damage (peak to peak): 40 / 1.6 mm/inch - Minimum Impedance: 6.3 ohm - Voice Coil Diameter: 100 / 4 mm/inch - Voice Coil Material: Copper - Voice Coil Winding Depth: 18.5 / 0.7 mm/inch - Number of layers: 2 - Kind of layer: inside / outside - Top Plate Thickness: 10 / 0.4 mm/inch - Cone Material: No pressed pulp - Cone Design: Curved - Surround Material: Polycotton - Surround Design: M-roll Thiele/Small Parameters: - Resonance frequency: 39 Hz - DC resistance: 4.9 ohm - Mechanical factor: 8.3 - Electrical factor: 0.30 - Total factor: 0.29 - BL Factor: 24.5 T · m - Effective Moving Mass: 148 g - Equivalent Cas air load: 206 liters - Effective piston area: 0.113 m2 - Max. linear excursion (mathematical): 6.8 mm - Voice-coil inductance @ 1kHz: 1.7 mH - Half-space efficiency: 3.93% Mounting Information: - Overall Diameter: 470 / 18.5 mm/inch - Bolt Circle Diameter: 438 / 17.2 mm/inch - Bolt Hole Diameter: 8 / 0.3 mm/inch - Front Mount Baffle Cut-out: 416 / 16.4 mm/inch - Rear Mount Baffle Cut-out: 416 / 16.4 mm/inch - Depth: 209 / 8.3 mm/inch - Volume occupied by the driver: 6.5 / 0.23 liters/ft3 - Net Weight: 13.1 / 29.1 kg/lbs - Shipping weight: 13.8 / 30.7 kg/lbs