Fostex FW800HS
Subwoofer
31.5″ / 800 mm
Nominal diameter
25 Hz
Resonance
0.69
Q factor
98 dB
Sensitivity
± 2.3 mm
Linear excursion
450 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
98.4
dB
Frequency response
25 - 1500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
25.0
Hz
Mechanical quality factor
QMS
19.22
Electrical quality factor
QES
0.71
Total quality factor
QTS
0.69
Large signal parameters
Maximum linear excursion
xmax
2.3
mm
Air volume displaced at xmax
VD
924
cm³
Power handling
P
150
W
Program power
Pmax
450
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.6
Ω
Inductance (1kHz)
LE
0.16
mH
VC Diameter
99
mm
Magnet
Force factor
Bl
30.25
N/A
Motor constant
Bl/√RE
11.8
N/√W
Weight
2.03
kg
Material
Ferrite
Diaphragm
Effective diameter
715
mm
Effective area
SD
4015
cm²
Moving mass
MMS
692
g
Moving mass (without air load)
MMD
523.1
g
Suspensions
Stiffness
KMS
15.53
N/mm
Compliance
CMS
64
µm/N
Equivalent volume to the compliance
VAS
1473.0
L
Mechanical resistance
RMS
5.66
N·s/m
Dimensions
Nominal diameter
31.5
″
800
mm
Overall diameter
800
mm
Baffle cutout diameter
750
mm
Overall depth
291
mm
Volume occupied by the driver (estimated)
17.0
L
Net weight
20.7
kg
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