RCF 18" Speaker, 1000W, 97.5dB, 25-2000Hz, X-max 9.0mm, weight 13.35kg Experience exceptional linearity in frequency response with this RCF 18" speaker, boasting a high power handling capacity of 1000W and producing minimal harmonic distortion. The LF18X400 features a fiber-loaded cone assembly and a high excursion triple roll surround for optimal performance. Its T-pole design minimizes flux modulation and incorporates RCF Precision's spaced gap demodulation technology for smooth voice coil transition. The speaker is equipped with a forced air venting system for efficient cooling. **Features:** - 4-inch fiberglass inside/outside copper voice coil - 2000W continuous program power handling - 97.5 dB sensitivity - 25 Hz – 1 kHz frequency range - Progressive, spaced aluminum demodulation rings - Forced air ventilation and 14 mm top plate for minimal power compression - 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: 2000 W AES - Power Handling Capacity: 1000 W AES - Sensitivity: 97.5 dB - Frequency Range: 25 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: 6.0 ohms - Voice Coil Diameter: 100 / 4 mm/inch - Voice Coil Material: Copper - Voice Coil Winding Depth: 25 / 1.0 mm/inch - Number of Layers: 2 - Layer Type: Inside / Outside - Top Plate Thickness: 14/0.55 mm/inch - Cone Material: Non-pressed pulp - Cone Design: Straight - Surround Material: Polycotton - Surround Design: Triple roll **Thiele/Small Parameters:** - Resonance Frequency: 28 Hz - DC Resistance: 5.1 ohms - Mechanical Factor: 6.5 - Electrical Factor: 0.29 - Total Factor: 0.27 - BL Factor: 25 T · m - Effective Moving Mass: 192 g - Equivalent Cas Air Load: 340 liters - Effective Piston Area: 0.122 m² - Max. Linear Excursion (Mathematical): 9.0 mm - Voice-Coil Inductance @ 1kHz: 2.3 mH - Half-Space Efficiency: 2.64% **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 / 0.25 mm/inch - Front Mount Baffle Cut-out: 424 / 16.7 mm/inch - Rear Mount Baffle Cut-out: 424 / 16.7 mm/inch - Depth: 210 / 8.3 mm/inch - Volume Occupied by the Driver: 7.0 / 0.25 liters/ft³ - Net Weight: 13.3 / 29.3 kg/lbs **Shipping Information:** - Shipping Weight: 14.3 / 31.5 kg/lbs