Fostex FF105WK
Full-range
4″ / 100 mm
Nominal diameter
75 Hz
Resonance
0.41
Q factor
89 dB
Sensitivity
± 1.7 mm
Linear excursion
30 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
88.9
dB
Frequency response
75 - 25000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
75.0
Hz
Mechanical quality factor
QMS
4.20
Electrical quality factor
QES
0.46
Total quality factor
QTS
0.41
Large signal parameters
Maximum linear excursion
xmax
1.7
mm
Air volume displaced at xmax
VD
8.5
cm³
Power handling
P
10
W
Program power
Pmax
30
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.7
Ω
Inductance (1kHz)
LE
0.04
mH
VC Diameter
20
mm
Magnet
Force factor
Bl
4.82
N/A
Motor constant
Bl/√RE
1.86
N/√W
Weight
0.34
kg
Diaphragm
Effective diameter
80
mm
Effective area
SD
50
cm²
Moving mass
MMS
3.4
g
Moving mass (without air load)
MMD
3.1
g
Suspensions
Stiffness
KMS
0.74
N/mm
Compliance
CMS
1346
µm/N
Equivalent volume to the compliance
VAS
4.85
L
Mechanical resistance
RMS
0.38
N·s/m
Dimensions
Nominal diameter
4
″
100
mm
Overall diameter
107
mm
Baffle cutout diameter
93
mm
Overall depth
53
mm
Volume occupied by the driver (estimated)
0.19
L
Net weight
0.8
kg
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4″Full-range
fS
75 Hz
SD
57 cm²
75 - 20000 Hz
QTS
0.38
xmax
3.0 mm
SPL1W
89 dB
Bl/√RE
2.05
Pmax
50 W
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4″Full-range
fS
75 Hz
SD
57 cm²
75 - 20000 Hz
QTS
0.38
xmax
3.0 mm
SPL1W
89 dB
Bl/√RE
1.97
Pmax
50 W
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4″Full-range
fS
75 Hz
SD
57 cm²
75 - 20000 Hz
QTS
0.36
xmax
3.0 mm
SPL1W
90 dB
Bl/√RE
2.12
Pmax
50 W