SB Acoustics SB12PAC25-4
Mid Bass
4″ / 102 mm
Nominal diameter
53 Hz
Resonance
0.31
Q factor
86 dB
Sensitivity
± 5 mm
Linear excursion
60 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
85.5
dB
Thiele & Small parameters
Resonance frequency (free air)
fS
52.5
Hz
Mechanical quality factor
QMS
5.00
Electrical quality factor
QES
0.33
Total quality factor
QTS
0.31
Large signal parameters
Maximum linear excursion
xmax
5.0
mm
Air volume displaced at xmax
VD
25
cm³
Power handling
P
30
W
Program power
Pmax
60
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.1
Ω
Inductance (1kHz)
LE
0.25
mH
VC Diameter
25
mm
Winding height
HVC
15
mm
Magnet
Flux density
B
1.03
T
Force factor
Bl
4.35
N/A
Motor constant
Bl/√RE
2.47
N/√W
Air gap height
HAG
5
mm
Weight
0.4
kg
Diaphragm
Effective diameter
80
mm
Effective area
SD
50
cm²
Moving mass
MMS
6.1
g
Moving mass (without air load)
MMD
5.8
g
Suspensions
Stiffness
KMS
0.67
N/mm
Compliance
CMS
1500
µm/N
Equivalent volume to the compliance
VAS
5.3
L
Mechanical resistance
RMS
0.4
N·s/m
Dimensions
Nominal diameter
4
″
102
mm
Volume occupied by the driver (estimated)
0.34
L
Net weight
0.86
kg
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4″Mid Bass
fS
51 Hz
SD
54 cm²
50 - 3500 Hz
QTS
0.32
xmax
3.0 mm
SPL1W
85 dB
Bl/√RE
2.59
Pmax
150 W
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5″Woofer
fS
59 Hz
SD
53 cm²
65 - 5400 Hz
QTS
0.34
xmax
4.0 mm
SPL1W
85 dB
Bl/√RE
2.29
Pmax
60 W