Fountek FW100B
Mid Bass
4″ / 100 mm
Nominal diameter
77 Hz
Resonance
0.63
Q factor
83 dB
Sensitivity
± 4 mm
Linear excursion
70 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
83.2
dB
Frequency response
77 - 4500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
77.0
Hz
Mechanical quality factor
QMS
3.09
Electrical quality factor
QES
0.79
Total quality factor
QTS
0.63
Large signal parameters
Maximum linear excursion
xmax
4.0
mm
Air volume displaced at xmax
VD
22
cm³
Power handling
P
35
W
Program power
Pmax
70
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.2
Ω
Inductance (1kHz, estimated)
LE
0.3
mH
VC Diameter
26
mm
Winding height
HVC
14
mm
Winding material
Copper
Former material
Aluminum
Magnet
Flux density
B
1.0
T
Force factor
Bl
5.59
N/A
Motor constant
Bl/√RE
2.24
N/√W
Air gap height
HAG
14
mm
Material
Ferrite
Diaphragm
Effective diameter
84
mm
Effective area
SD
55
cm²
Moving mass
MMS
8
g
Moving mass (without air load)
MMD
7.7
g
Suspensions
Stiffness
KMS
2.05
N/mm
Compliance
CMS
487
µm/N
Equivalent volume to the compliance
VAS
2.12
L
Mechanical resistance
RMS
1.26
N·s/m
Dimensions
Nominal diameter
4
″
100
mm
Overall diameter
105
mm
Overall depth
60
mm
Volume occupied by the driver (estimated)
0.22
L
Net weight
0.9
kg
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SpeakerbenchSimilar speaker drivers to Fountek FW100B
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4″Full-range
fS
90 Hz
SD
50 cm²
80 - 20000 Hz
QTS
0.67
xmax
1.5 mm
SPL1W
83 dB
Bl/√RE
1.71
Pmax
50 W
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4″Woofer
fS
83 Hz
SD
50 cm²
70 - 10000 Hz
QTS
0.70
xmax
1.8 mm
SPL1W
83 dB
Bl/√RE
1.8
Pmax
70 W
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