Eighteen Sound 21NLW4000

Subwoofer

Nominal diameter21″ / 533 mm
Resonance27 Hz
Q factor0.38
Sensitivity94.1 dB
Linear excursion± 15 mm
Program Power3200 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 94.1dB
  • Frequency response 30 - 1800Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 27Hz
  • Mechanical quality factor QMS 16.30
  • Electrical quality factor QES 0.39
  • Total quality factor QTS 0.38

Large signal parameters

  • Maximum linear excursion xmax 15mm
  • Air volume displaced at xmax VD 2490cm³
  • Power handling P 1600W
  • Program power Pmax 3200W

Voice Coil

  • Nominal impedance Z 4Ω
  • DC resistance RE 2.6Ω
  • Inductance (1kHz) LE 1.3mH
  • VC Diameter 100mm

Magnet

  • Force factor Bl 20N/A
  • Motor constant Bl/√RE 12.4N/√W
  • Material Neodymium

Diaphragm

  • Effective diameter 460mm
  • Effective area SD 1660cm²
  • Moving mass MMS 355g
  • Moving mass (without air load) MMD 308g
  • Material Weather protected

Suspensions

  • Stiffness KMS 10.2N/mm
  • Compliance CMS 98µm/N
  • Equivalent volume to the compliance VAS 380L
  • Mechanical resistance RMS 3.69N·s/m

Dimensions

  • Nominal diameter 21
  • 533mm
  • Overall diameter 545mm
  • Baffle cutout diameter 492mm
  • Overall depth 245mm
  • Flange thickness 18mm
  • Mounting depth 227mm
  • Volume occupied by the driver (estimated) 8.2L
  • Net weight 11.6kg
Eighteen Sound 21NLW4000 Impedance
Eighteen Sound 21NLW4000 SPL
Eighteen Sound 21NLW4000 Dimensions

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