Eighteen Sound 18NLW4500 8Ω

Subwoofer

Nominal diameter18″ / 462 mm
Resonance35 Hz
Q factor0.33
Sensitivity94.2 dB
Linear excursion± 15.3 mm
Program Power3600 W
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 94.2dB
  • Frequency response 30 - 1000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 35Hz
  • Mechanical quality factor QMS 9.70
  • Electrical quality factor QES 0.34
  • Total quality factor QTS 0.33

Large signal parameters

  • Maximum linear excursion xmax 15.3mm
  • Air volume displaced at xmax VD 1874cm³
  • Power handling P 1800W
  • Program power Pmax 3600W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 5.0Ω
  • Inductance (1kHz) LE 2mH
  • VC Diameter 115mm
  • Winding material Copper

Magnet

  • Force factor Bl 30.3N/A
  • Motor constant Bl/√RE 13.6N/√W

Diaphragm

  • Effective diameter 395mm
  • Effective area SD 1225cm²
  • Moving mass MMS 286g
  • Moving mass (without air load) MMD 256g

Suspensions

  • Stiffness KMS 13.9N/mm
  • Compliance CMS 72µm/N
  • Equivalent volume to the compliance VAS 151L
  • Mechanical resistance RMS 6.48N·s/m

Dimensions

  • Nominal diameter 18
  • 462mm
  • Overall diameter 462mm
  • Baffle cutout diameter 422mm
  • Overall depth 233mm
  • Flange thickness 23mm
  • Mounting depth 210mm
  • Volume occupied by the driver (estimated) 7.3L
  • Net weight 12.0kg
Eighteen Sound 18NLW4500 8Ω Impedance
Eighteen Sound 18NLW4500 8Ω SPL
Eighteen Sound 18NLW4500 8Ω Dimensions

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