Eighteen Sound 8MB400

Woofer

Nominal diameter8″ / 200 mm
Resonance64 Hz
Q factor0.38
Sensitivity93.1 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 93.1dB
  • Frequency response 55 - 5200Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 64Hz
  • Mechanical quality factor QMS 3.23
  • Electrical quality factor QES 0.43
  • Total quality factor QTS 0.38

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 8Ω
  • DC resistance RE 5.0Ω
  • Inductance (1kHz) LE 0.96mH
  • VC Diameter 50mm
  • Winding material Aluminum

Magnet

  • Force factor Bl 9.3N/A
  • Motor constant Bl/√RE 4.16N/√W
  • Material Ferrite

Diaphragm

  • Effective diameter 170mm
  • Effective area SD 227cm²
  • Moving mass MMS 18g
  • Moving mass (without air load) MMD 15.5g
  • Material Weather protected

Suspensions

  • Stiffness KMS 2.91N/mm
  • Compliance CMS 344µm/N
  • Equivalent volume to the compliance VAS 23.9L
  • Mechanical resistance RMS 2.24N·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) 1.2L
  • Net weight 3.6kg
Eighteen Sound 8MB400 Impedance
Eighteen Sound 8MB400 SPL
Eighteen Sound 8MB400 Dimensions

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