Fostex W400A-HR
Woofer
15″ / 400 mm
Nominal diameter
25 Hz
Resonance
0.31
Q factor
93 dB
Sensitivity
± 5.5 mm
Linear excursion
200 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
92.8
dB
Frequency response
25 - 2500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
25.0
Hz
Mechanical quality factor
QMS
8.20
Electrical quality factor
QES
0.32
Total quality factor
QTS
0.31
Large signal parameters
Maximum linear excursion
xmax
5.5
mm
Air volume displaced at xmax
VD
451
cm³
Power handling
P
67
W
Program power
Pmax
200
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.0
Ω
Inductance (1kHz)
LE
2.64
mH
VC Diameter
100
mm
Magnet
Force factor
Bl
19.5
N/A
Motor constant
Bl/√RE
7.96
N/√W
Weight
3.1
kg
Material
Alnico
Diaphragm
Effective diameter
323
mm
Effective area
SD
820
cm²
Moving mass
MMS
130
g
Moving mass (without air load)
MMD
113.1
g
Suspensions
Stiffness
KMS
3.03
N/mm
Compliance
CMS
330
µm/N
Equivalent volume to the compliance
VAS
310
L
Mechanical resistance
RMS
2.49
N·s/m
Dimensions
Nominal diameter
15
″
400
mm
Overall diameter
395
mm
Baffle cutout diameter
357
mm
Overall depth
242
mm
Volume occupied by the driver (estimated)
9.8
L
Net weight
21.4
kg
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fS
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SD
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QTS
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xmax
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SPL1W
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Bl/√RE
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fS
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SD
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30 - 2000 Hz
QTS
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xmax
9.0 mm
SPL1W
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Bl/√RE
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Pmax
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