Fostex FF125WK
Full-range
4.5″ / 120 mm
Nominal diameter
67 Hz
Resonance
0.42
Q factor
89 dB
Sensitivity
± 1.65 mm
Linear excursion
50 W
Program Power
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- Sensitivity (1W, 1m, infinite baffle)
- SPL1W
- 89.1
- dB
- Frequency response
- 67 - 22000
- Hz
- Resonance frequency (free air)
- fS
- 67.0
- Hz
- Mechanical quality factor
- QMS
- 5.09
- Electrical quality factor
- QES
- 0.46
- Total quality factor
- QTS
- 0.42
- Maximum linear excursion
- xmax
- 1.65
- mm
- Air volume displaced at xmax
- VD
- 11
- cm³
- Power handling
- P
- 16
- W
- Program power
- Pmax
- 50
- W
- Nominal impedance
- Z
- 8
- Ω
- DC resistance
- RE
- 6.7
- Ω
- Inductance (1kHz)
- LE
- 0.04
- mH
- Force factor
- Bl
- 5.6
- N/A
- Motor constant
- Bl/√RE
- 2.16
- N/√W
- Weight
- 0.388
- kg
- Effective diameter
- 92
- mm
- Effective area
- SD
- 66
- cm²
- Moving mass
- MMS
- 5
- g
- Moving mass (without air load)
- MMD
- 4.6
- g
- Stiffness
- KMS
- 0.87
- N/mm
- Compliance
- CMS
- 1153
- µm/N
- Equivalent volume to the compliance
- VAS
- 7.27
- L
- Mechanical resistance
- RMS
- 0.41
- N·s/m
- Nominal diameter
- 4.5
- ″
- 120
- mm
- Overall diameter
- 117
- mm
- Baffle cutout diameter
- 104
- mm
- Overall depth
- 61
- mm
- Volume occupied by the driver (estimated)
- 0.24
- L
- Net weight
- 0.92
- kg
Thiele & Small parameters
Large signal parameters
Voice Coil
Magnet
Diaphragm
Suspensions
Dimensions
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Export this driver to a simulation software:
WinISD
Basta!
Hornresp
QSpeakers
SpeakerSim
MfbLabs
Speakerbench.jpg.webp)
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