RCF LF18X401 18″ Bass Speaker 1500 watt power 4inch VC

• 4-inch, fiberglass inside/outside copper voice coil 3000W continuous program power handling 97.5 dB Sensitivity 25 Hz – 1 kHz Frequency range Dual Forced Hyperventing System Dual spider design with silicon based dampening control Triple-roll surround and corrugated straight cone geometry

  Incredibly linear frequency response characteristics, the highest power handling of any comparable 18-inch transducer, the lowest power compression. Very linear frequency response characteristics, extreme high power handling while generating the lowest harmonic distortion of any comparable 18-inch transducer within its application range. The LF18X401 uses a fibre loaded cone assembly along with a high excursion triple roll surround. This combination provides remarkable strength and a peak to peak maximum excursion of 50 mm. The new dual forced hyper-venting system guarantee a very efficient voice coil ventilation for minimum power compression and incredible power handling. APPLICATIONS - The LF18X401 is ideal for use in applications where sizable amounts of low frequency, long excursion and low distortion acoustic power is desired. - The robust mechanical design and optimised weight of the device make it desirable for use in fixed installation or touring professional loudspeaker systems. - The transducer's low frequency extension, coupled with its extremely low generation of harmonic distortion, also makes it ideal for use within critical listening applications such as studio monitoring subwoofer systems.

                      Specifications

Nominal Diameter                       545 mm (21“)
Nominal Impedance                        4 Ω
Rated Power AES                           1000 W
Continuous Program Power                  2000 W
Sensitivity @ 1W/1m                       97.0 dB
Voice Coil Diameter                     100 mm (4“)
Voice Coil Winding Depth                  25 mm
Magnetic Gap Depth                        17 mm
Flux Density                              0.94 T
Magnet Weight                              536 g
Net Weight                                10.5 kg

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Nominal Specifications

    Nominal Diameter 18“, 460 mm
    Overall Diameter 18.11“, 460 mm
    Bolt Circle Diameter 17.32“, 440 mm
    Baffle Cutout Diameter 16.6“, 422 mm
    Depth 9.09“, 231 mm
    Flange and Gasket Thickness 0.55“, 14 mm


Electrical Specifications

    Minimum Impedance 7.2 Ohm
    Nominal Impedance 8 Ohm
    Nominal Power Handling*** 1,600 W
    Maximum Power Handling**** 3,200 W
    Sensitivity (1W/1m) 98 dB
    Frequency Range 30 - 1500 Hz
    Voice Coil Diameter 4“, 100 mm
    Winding Material Copper
    Former Material Glass Fiber
    Winding Depth 1.23“, 31.3 mm
    Magnetic Gap Depth 0.61“, 15.5 mm
    Flux Density 1.05 T


THIELE & SMALL Parameters

    Resonant Frequency (fs) 32 Hz
    DC Resistance (Re) 5.4 Ohm
    BL Product (BL) 26.7 N/A
    Diaphragm Mass inc. Airload (Mms) 240 grams
    Mechanical Compliance of Suspension (Cms) 0.1 mm/N
    Rms 5.27 Kg/s
    Electromagnetic Q (Qes) 0.37
    Mechanical Q (Qms) 9.3
    Total Q (Qts) 0.36
    Compliance Equivalent Volume (Vas) 6.9 ft³, 195.5 dm³
    Surface Area of Cone (Sd) 182“², 1,174 cm²
    Maximum Linear Excursion (Xmax)* 13 mm
    Xdamage** 28 mm
    Coil Inductance (Le) 1.45 mH
    Diaphragm mass (Mmd) 217 g
    Eta Zero 1.76 %

Notes

    *Xmax = [(winding depth - magnetic gap depth) / 2] + (magnetic gap depth / 3)
    **Maximum excursion before permanent damage
    ***2 Hours Test According to AES 2-1984 Rev. 2003
    ****Maximum power is defined as 3dB greater than nominal power

• Shape Cylindrical
• Product type Cone driver
• Brand Sica
• Frequency coverage type Sub
• Dimensional category 18 inch
• Front chape Cylindrical
• Magnet type Ferrite
• Basket masterial Aluminium
• Nominal impedance 4 ohm
• Nominal power handling 700 W
• Max power handling 1400 W
• Sensitivity 97.9 dB
• Voice coil diameter 4 inch
• Flux density 1.12 T
• External diametre 462 mm
• Mounting diametre 415 mm
• Depth 203.5 mm
• Depth after front 188.5 mm
• Front thickness 15 mm
• Diamètre aimant (mm) 220 mm
• Weight 13.9 kg
• Fs 36.9 Hz
• Re 3.25 ohm
• Qes 0.29
• Qms 9.03
• Qts 0.28
• Vas 181.9 L
• Sd 1164.2 cm²
• Cms 95 µm/N
• Efficiency 3.02 %
• Xmax 6 mm
• Mms 196.2 gr
• BL 22.55 T.m
• Le 1.03 mH
• EBP 127
• Dome material Paper
• Cone material Paper
• Surround material Cloth
• Shipping weight 13.9 kg

• 4'' sandwich voice coil fiberglass former
• Double progressive wave Konex spider
• Cloth suround with DAR technology
• Autoclave waterproof cone treatment
• Balanced neodymium magnet circuit
• Cooling radiator and ventilated voice
• coil to reduce power compression
• 98.1 dB sensitivity

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