Eighteen Sound 8NMB420 16Ω

16Ω

Woofer

Nominal diameter8″ / 200 mm
Resonance66 Hz
Q factor0.41
Sensitivity93.5 dB
Linear excursion± 5.8 mm
Program Power400 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 93.5dB
  • Frequency response 60 - 5500Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 66Hz
  • Mechanical quality factor QMS 3.20
  • Electrical quality factor QES 0.47
  • Total quality factor QTS 0.41

Large signal parameters

  • Maximum linear excursion xmax 5.8mm
  • Air volume displaced at xmax VD 132cm³
  • Power handling P 280W
  • Program power Pmax 400W

Voice Coil

  • Nominal impedance Z 16Ω
  • DC resistance RE 9.8Ω
  • Inductance (1kHz) LE 0.61mH
  • VC Diameter 51mm

Magnet

  • Force factor Bl 12N/A
  • Motor constant Bl/√RE 3.83N/√W

Diaphragm

  • Effective diameter 170mm
  • Effective area SD 227cm²
  • Moving mass MMS 17g
  • Moving mass (without air load) MMD 14.5g

Suspensions

  • Stiffness KMS 2.92N/mm
  • Compliance CMS 342µm/N
  • Equivalent volume to the compliance VAS 24.5L
  • Mechanical resistance RMS 2.2N·s/m

Dimensions

  • Nominal diameter 8
  • 200mm
  • Overall diameter 210mm
  • Baffle cutout diameter 186mm
  • Overall depth 99mm
  • Flange thickness 14mm
  • Mounting depth 85mm
  • Volume occupied by the driver (estimated) 0.72L
  • Net weight 1.7kg
Eighteen Sound 8NMB420 16Ω SPL
Eighteen Sound 8NMB420 16Ω Dimensions

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