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
Thiele & Small parameters
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
Large signal parameters
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
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.7
Ω
Inductance (1kHz)
LE
0.04
mH
Magnet
Force factor
Bl
5.6
N/A
Motor constant
Bl/√RE
2.16
N/√W
Weight
0.388
kg
Diaphragm
Effective diameter
92
mm
Effective area
SD
66
cm²
Moving mass
MMS
5
g
Moving mass (without air load)
MMD
4.6
g
Suspensions
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
Dimensions
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
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fS
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SD
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100 - 2500 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
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Pmax
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4″Full-range
fS
70 Hz
SD
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70 - 17000 Hz
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fS
70 Hz
SD
92 cm²
70 - 6000 Hz
QTS
0.39
xmax
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SPL1W
88 dB
Bl/√RE
3.48
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