Fostex FE108EΣ
Full-range
4″ / 100 mm
Nominal diameter
77 Hz
Resonance
0.3
Q factor
92 dB
Sensitivity
± 0.28 mm
Linear excursion
24 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
91.7
dB
Frequency response
77 - 23000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
77.0
Hz
Mechanical quality factor
QMS
7.79
Electrical quality factor
QES
0.32
Total quality factor
QTS
0.30
Large signal parameters
Maximum linear excursion
xmax
0.28
mm
Air volume displaced at xmax
VD
1.4
cm³
Power handling
P
8
W
Program power
Pmax
24
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.8
Ω
Inductance (1kHz)
LE
0.04
mH
VC Diameter
20
mm
Magnet
Force factor
Bl
5.2
N/A
Motor constant
Bl/√RE
1.99
N/√W
Weight
0.4
kg
Material
Ferrite
Diaphragm
Effective diameter
80
mm
Effective area
SD
50
cm²
Moving mass
MMS
2.7
g
Moving mass (without air load)
MMD
2.4
g
Suspensions
Stiffness
KMS
0.63
N/mm
Compliance
CMS
1590
µm/N
Equivalent volume to the compliance
VAS
5.7
L
Mechanical resistance
RMS
0.17
N·s/m
Dimensions
Nominal diameter
4
″
100
mm
Overall diameter
128
mm
Baffle cutout diameter
100
mm
Overall depth
65
mm
Volume occupied by the driver (estimated)
0.32
L
Net weight
1.2
kg
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SpeakerbenchSimilar speaker drivers to Fostex FE108EΣ
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4″Full-range
fS
83 Hz
SD
50 cm²
83 - 22000 Hz
QTS
0.33
xmax
0.6 mm
SPL1W
91 dB
Bl/√RE
1.82
Pmax
15 W
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5.25″Mid-range
fS
73 Hz
SD
83 cm²
73 - 5500 Hz
QTS
0.28
xmax
1.5 mm
SPL1W
90 dB
Bl/√RE
3.17
Pmax
60 W
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4″Full-range
fS
70 Hz
SD
57 cm²
70 - 16000 Hz
QTS
0.32
xmax
3.3 mm
SPL1W
90 dB
Bl/√RE
2.29
Pmax
50 W