SB Acoustics SB65WBAC25-4
Full-range
2.5″ / 64 mm
Nominal diameter
115 Hz
Resonance
0.68
Q factor
81 dB
Sensitivity
± 2.65 mm
Linear excursion
40 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
81.4
dB
Thiele & Small parameters
Resonance frequency (free air)
fS
115
Hz
Mechanical quality factor
QMS
6.00
Electrical quality factor
QES
0.77
Total quality factor
QTS
0.68
Large signal parameters
Maximum linear excursion
xmax
2.65
mm
Air volume displaced at xmax
VD
5.3
cm³
Power handling
P
20
W
Program power
Pmax
40
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.6
Ω
Inductance (1kHz)
LE
0.15
mH
VC Diameter
25
mm
Winding height
HVC
8.3
mm
Magnet
Flux density
B
1.02
T
Force factor
Bl
2.9
N/A
Motor constant
Bl/√RE
1.53
N/√W
Air gap height
HAG
3
mm
Weight
0.02
kg
Diaphragm
Effective diameter
50
mm
Effective area
SD
20
cm²
Moving mass
MMS
2.5
g
Moving mass (without air load)
MMD
2.4
g
Suspensions
Stiffness
KMS
1.3
N/mm
Compliance
CMS
770
µm/N
Equivalent volume to the compliance
VAS
0.43
L
Mechanical resistance
RMS
0.3
N·s/m
Dimensions
Nominal diameter
2.5
″
64
mm
Net weight
0.14
kg
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fS
120 Hz
SD
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80 - 15000 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
1.43
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2.5″Full-range
fS
109 Hz
SD
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110 - 17000 Hz
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fS
109 Hz
SD
25 cm²
85 - 13000 Hz
QTS
0.63
xmax
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SPL1W
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Bl/√RE
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Pmax
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