HELIX COMPOSE CB C87.2-S3
2 way
3.5″ / 87 mm
Nominal diameter
92 Hz
Resonance
0.62
Q factor
84 dB
Sensitivity
± 2.2 mm
Linear excursion
60 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
83.9
dB
Frequency response
110 - 22000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
92.0
Hz
Mechanical quality factor
QMS
3.80
Electrical quality factor
QES
0.74
Total quality factor
QTS
0.62
Large signal parameters
Maximum linear excursion
xmax
2.2
mm
Air volume displaced at xmax
VD
7.9
cm³
Power handling
P
40
W
Program power
Pmax
60
W
Voice Coil
Nominal impedance
Z
3
Ω
DC resistance
RE
3.0
Ω
Inductance (1kHz, estimated)
LE
0.09
mH
VC Diameter
25
mm
Winding height
HVC
8.3
mm
Magnet
Force factor
Bl
2.9
N/A
Motor constant
Bl/√RE
1.67
N/√W
Diaphragm
Effective diameter
68
mm
Effective area
SD
36
cm²
Moving mass
MMS
3.6
g
Moving mass (without air load)
MMD
3.4
g
Suspensions
Stiffness
KMS
1.22
N/mm
Compliance
CMS
820
µm/N
Equivalent volume to the compliance
VAS
1.5
L
Mechanical resistance
RMS
0.52
N·s/m
Dimensions
Nominal diameter
3.5
″
87
mm
Overall diameter
87
mm
Baffle cutout diameter
79
mm
Mounting depth
42
mm
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fS
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SD
39 cm²
90 - 20000 Hz
QTS
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SPL1W
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Bl/√RE
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Pmax
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3.75″Mid-range
fS
86 Hz
SD
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fS
96 Hz
SD
37 cm²
90 - 12500 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
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