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.

• 1400 W continuous program power capacity
• 100 mm (4 in) copper voice coil
• 40 - 2000 Hz response
• 97 dB sensitivity
• Double silicone spider with optimized compliance

• Specifications
  • Nominal diameter460 mm (18.0 in)
  • Nominal impedance8 Ω
  • Minimum impedance6.5 Ω
  • Nominal power handling *700 W
  • Continuous power handling *1400 W
  • Sensitivity (1W/1m) *97.0 dB
  • Frequency range40 - 2000 Hz
  • Voice coil diameter100 mm (4.0 in)
  • Winding materialCopper
  • Former materialGlass Fibre
  • Winding depth21 mm (0.83 in)
  • Magnetic gap depth8 mm (0.31 in)
  • Flux density1.15 T
• Design
  • Surround shapeDouble Roll
  • Cone shapeExponential
  • Magnet materialFerrite
  • SpiderDouble Silicone
  • Pole designStraight Pole
  • Woofer cone treatmentTWP Waterproof Both Sides
  • Recommended enclosure160.0 dm3 (5.65 ft3)
  • Recommended tuning39 Hz
• Parameters *
  • Fs30 Hz
  • Re5.3 Ω
  • Qes0.25
  • Qms8.8
  • Qts0.24
  • Vas297.0 dm3 (10.5 ft3)
  • Sd1134.0 cm2 (175.8 in2)
  • η₀3.1 %
  • Xmax8.0 mm
  • Xvar8.0 mm
  • Mms170 g
  • Bl26.0 Txm
  • Le2.1 mH
  • EBP120 Hz
• Mounting And Shipping Info
  • Overall diameter480 mm (18.0 in)
  • Bolt circle diameter440 mm (17.3 in)
  • Baffle cutout diameter422.0 mm (16.6 in)
  • Depth202 mm (7.95 in)
  • Flange and gasket thickness16 mm (0.62 in)
  • Air volume occupied by driver9.5 dm3 (0.33 ft3)
  • Net weight12.1 kg (26.6 lb)
  • Shipping units1
  • Shipping weight14.0 kg (30.8 lb)
  • Shipping box520x520x240 mm (20.5x20.5x9.4 in)

Nominal Specifications

    Nominal Diameter 18“, 460 mm
    Overall Diameter 18.11“, 460 mm
    Bolt Circle Diameter 17.32“, 440 mm
    Baffle Cutout Diameter 16.61“, 422 mm
    Depth 7.95“, 202 mm
    Flange and Gasket Thickness 0.55“, 13.9 mm


Electrical Specifications

    Minimum Impedance 6.6 Ohm
    Nominal Impedance 8 Ohm
    Nominal Power Handling*** 1,000 W
    Maximum Power Handling**** 2,000 W
    Sensitivity (1W/1m) 99 dB
    Frequency Range 38 - 2500 Hz
    Voice Coil Diameter 4“, 100 mm
    Winding Material Aluminium
    Former Material Glass Fiber
    Winding Depth 0.9“, 23 mm
    Magnetic Gap Depth 0.47“, 12 mm
    Flux Density 1.3 T


THIELE & SMALL Parameters

    Resonant Frequency (fs) 38 Hz
    DC Resistance (Re) 5.5 Ohm
    BL Product (BL) 24.5 N/A
    Diaphragm Mass inc. Airload (Mms) 163 grams
    Mechanical Compliance of Suspension (Cms) 0.11 mm/N
    Rms 4.42 Kg/s
    Electromagnetic Q (Qes) 0.35
    Mechanical Q (Qms) 8.75
    Total Q (Qts) 0.34
    Compliance Equivalent Volume (Vas) 7.37 ft³, 208.8 dm³
    Surface Area of Cone (Sd) 180.7“², 1,166 cm²
    Maximum Linear Excursion (Xmax)* 9.5 mm
    Xdamage** 17.5 mm
    Coil Inductance (Le) 1.36 mH
    Diaphragm mass (Mmd) 141 g
    Eta Zero 3.14 %

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

• 95 dB Sensitivity 1 W / 1 m
• 1.200 W Power Handling
• 4" Copper Sandwich Voice Coil for low Power Compression
• Neodymium Magnet System
• Double treated Cone for Water Protection
• Triple Aluminum demodulating Rings for ultra low Distortion
• Optimal for high Output Subwoofers
• Leight Weight Carbon Fiber Diaphragm

                      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

Manual/Εγχειρίδιο

• Nominal Basket Diameter 18“, 457 mm
• Nominal Impedance 8 ohms
• Power Rating Watts 500 W / Music Program 1000 W
• Resonance 28 Hz
• Usable Frequency Range 37 Hz - 250 Hz
• Sensitivity 96
• Magnet Weight 67 oz.
• Gap Height 0.38“, 9.53 mm
• Voice Coil Diameter 2.5“, 63.5 mm

• Resonant Frequency (fs) 28 Hz
• DC Resistance (Re) 5.3
• Coil Inductance (Le) 3.43 mH
• Mechanical Q (Qms) 10.38
• Electromagnetic Q (Qes) 0.33
• Total Q (Qts) 0.32
• Compliance Equivalent Volume (Vas) 493.19 liters / 17.41 cu. ft.
• Peak Diaphragm Displacement Volume (Vd) 796.00 cc
• Mechanical Compliance of Suspension (Cms) 0.25 mm/N
• BL Product (BL) 18.9 T-M
• Diaphragm Mass inc. Airload (Mms) 128.1 grams
• Efficiency Bandwidth Product (EBP) 84
• Maximum Linear Excursion (Xmax) 6.7 mm
• Surface Area of Cone (Sd) 1188.0 cm²
• Maximum Mechanical Limit (Xlim) 15.0 mm

• Recommended Enclosure Volume Sealed N/A Vented 85-297 liters/3.0-10.5 cu. ft.
• Overall Diameter 18.00“, 457.20 mm
• Baffle Hole Diameter 16.57“, 420.88 mm
• Front Sealing Gasket fitted as standard
• Rear Sealing Gasket fitted as standard
• Mounting Holes Diameter 0.28“, 7.11 mm
• Mounting Holes B.C.D. 17.25“, 438.15 mm
• Depth 8.13“, 206.50 mm

• Copper voice coil
• Polyimide former
• Ferrite magnet
• Vented and extended core
• Die-cast aluminum basket
• Paper Cone
• Cloth cone edge
• Solid composition paper dust cap