Tang Band W4-639SE
Woofer
4″ / 102 mm
Nominal diameter
70 Hz
Resonance
0.47
Q factor
86 dB
Sensitivity
± 3.15 mm
Linear excursion
50 W
Program Power
Discontinued
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
85.9
dB
Frequency response
70 - 7000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
70.0
Hz
Mechanical quality factor
QMS
3.70
Electrical quality factor
QES
0.54
Total quality factor
QTS
0.47
Large signal parameters
Maximum linear excursion
xmax
3.15
mm
Air volume displaced at xmax
VD
18
cm³
Power handling
P
25
W
Program power
Pmax
50
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.0
Ω
Inductance (1kHz)
LE
0.17
mH
VC Diameter
25
mm
Magnet
Force factor
Bl
5.51
N/A
Motor constant
Bl/√RE
2.25
N/√W
Air gap height
HAG
5
mm
Material
Ferrite
Diaphragm
Effective diameter
85
mm
Effective area
SD
57
cm²
Moving mass
MMS
6
g
Moving mass (without air load)
MMD
5.7
g
Material
Kevlar Fiber
Suspensions
Stiffness
KMS
1.23
N/mm
Compliance
CMS
811
µm/N
Equivalent volume to the compliance
VAS
3.74
L
Mechanical resistance
RMS
0.71
N·s/m
Surround material
Rubber
Dimensions
Nominal diameter
4
″
102
mm
Volume occupied by the driver (estimated)
0.14
L
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SpeakerbenchSimilar woofers to Tang Band W4-639SE
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4″Woofer
fS
73 Hz
SD
54 cm²
100 - 8000 Hz
QTS
0.46
xmax
4.4 mm
SPL1W
86 dB
Bl/√RE
2.36
Pmax
90 W
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5″Woofer
fS
76 Hz
SD
54 cm²
75 - 9200 Hz
QTS
0.50
xmax
2.8 mm
SPL1W
86 dB
Bl/√RE
1.99
Pmax
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4″Full-range
fS
75 Hz
SD
57 cm²
75 - 20000 Hz
QTS
0.46
xmax
3.0 mm
SPL1W
87 dB
Bl/√RE
1.91
Pmax
60 W