Fostex W300AII

Woofer

Nominal diameter12″ / 300 mm
Resonance25 Hz
Q factor0.28
Sensitivity92.5 dB
Linear excursion± 6.5 mm
Program Power150 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 92.5dB
  • Frequency response 25 - 3000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 25Hz
  • Mechanical quality factor QMS 9.17
  • Electrical quality factor QES 0.29
  • Total quality factor QTS 0.28

Large signal parameters

  • Maximum linear excursion xmax 6.5mm
  • Air volume displaced at xmax VD 350cm³
  • Power handling P 50W
  • Program power Pmax 150W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 7.0Ω
  • Inductance (1kHz) LE 0.1mH
  • VC Diameter 80mm

Magnet

  • Force factor Bl 18.8N/A
  • Motor constant Bl/√RE 7.09N/√W
  • Weight 1.1kg
  • Material Alnico

Diaphragm

  • Effective diameter 262mm
  • Effective area SD 539cm²
  • Moving mass MMS 92.7g
  • Moving mass (without air load) MMD 83.8g

Suspensions

  • Stiffness KMS 17.9N/mm
  • Compliance CMS 56µm/N
  • Equivalent volume to the compliance VAS 227L
  • Mechanical resistance RMS 1.59N·s/m

Dimensions

  • Nominal diameter 12
  • 300mm
  • Overall diameter 317mm
  • Baffle cutout diameter 280mm
  • Overall depth 180mm
  • Volume occupied by the driver (estimated) 3.2L
  • Net weight 6.3kg
Fostex W300AII SPL & Impedance
Fostex W300AII Dimensions

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