RCF LF18Y402

Subwoofer

Nominal diameter18″ / 457 mm
Resonance30 Hz
Q factor0.30
Sensitivity94.8 dB
Linear excursion± 12 mm
Program Power2400 W
Ω°0102030405060101001 00010 000-180-120-60060120180Electrical ImpedanceElectrical Phase
mm05101520101001 00010 000Diaphragm ExcursionMaximum Linear Excursion
m/s0246810101001 00010 000Diaphragm Velocity
dB60708090100110120101001 00010 000SPL (1W, 1m, on axis)Maximum SPL
°-180-120-60060120180101001 00010 000Acoustical phase (1m, on axis)
ms051015202530101001 00010 000Group Delay (1m, on axis)
00.51-205101520Step response
-1-0.500.51-2010203040Response to a tone burst of Hz with cycles
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply
  • Sensitivity (1W, 1m, infinite baffle) SPL1W 94.8dB
  • Frequency response 25 - 1000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 30Hz
  • Mechanical quality factor QMS 7.40
  • Electrical quality factor QES 0.31
  • Total quality factor QTS 0.30

Large signal parameters

  • Maximum linear excursion xmax 12mm
  • Maximum excursion before damage xlim 25mm
  • Air volume displaced at xmax VD 1440cm³
  • Power handling P 1200W
  • Program power Pmax 2400W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 5.4Ω
  • Inductance (1kHz) LE 2.5mH
  • VC Diameter 102mm
  • Winding height HVC 30mm
  • Winding material Copper
  • Former material Glass Fiber

Magnet

  • Force factor Bl 26.5N/A
  • Motor constant Bl/√RE 11.4N/√W
  • Air gap height HAG 15mm

Diaphragm

  • Effective diameter 395mm
  • Effective area SD 1200cm²
  • Moving mass MMS 215g
  • Moving mass (without air load) MMD 186g

Suspensions

  • Stiffness KMS 7.58N/mm
  • Compliance CMS 132µm/N
  • Equivalent volume to the compliance VAS 274L
  • Mechanical resistance RMS 5.48N·s/m
  • Spider material with silicon damping

Dimensions

  • Nominal diameter 18
  • 457mm
  • Overall diameter 465mm
  • Baffle cutout diameter 424mm
  • Volume occupied by the driver 6.5L
  • Net weight 12.5kg
RCF LF18Y402 Impedance
RCF LF18Y402 SPL
RCF LF18Y402 Dimensions

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