HELIX PURE S 3M
Mid-range
3″ / 75 mm
Nominal diameter
130 Hz
Resonance
0.43
Q factor
86 dB
Sensitivity
± 2 mm
Linear excursion
150 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
86.0
dB
Frequency response
400 - 6000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
130
Hz
Mechanical quality factor
QMS
4.47
Electrical quality factor
QES
0.48
Total quality factor
QTS
0.43
Large signal parameters
Maximum linear excursion
xmax
2.0
mm
Air volume displaced at xmax
VD
6.4
cm³
Power handling
P
75
W
Program power
Pmax
150
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.2
Ω
Inductance (1kHz, estimated)
LE
0.1
mH
VC Diameter
25
mm
Winding height
HVC
8
mm
Magnet
Force factor
Bl
4.6
N/A
Motor constant
Bl/√RE
2.57
N/√W
Diaphragm
Effective diameter
64
mm
Effective area
SD
32
cm²
Moving mass
MMS
3.8
g
Moving mass (without air load)
MMD
3.7
g
Suspensions
Stiffness
KMS
2.53
N/mm
Compliance
CMS
396
µm/N
Equivalent volume to the compliance
VAS
0.57
L
Mechanical resistance
RMS
0.69
N·s/m
Dimensions
Nominal diameter
3
″
75
mm
Overall diameter
90
mm
Baffle cutout diameter
73
mm
Mounting depth
37
mm
Volume occupied by the driver (estimated)
0.1
L
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3″Full-range
fS
100 Hz
SD
32 cm²
100 - 20000 Hz
QTS
0.34
xmax
0.5 mm
SPL1W
87 dB
Bl/√RE
2.01
Pmax
30 W
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2.5″Full-range
fS
114 Hz
SD
23 cm²
110 - 20000 Hz
QTS
0.50
xmax
2.0 mm
SPL1W
83 dB
Bl/√RE
1.72
Pmax
40 W