HELIX PURE S 4B
Mid Bass
4″ / 100 mm
Nominal diameter
120 Hz
Resonance
0.88
Q factor
87 dB
Sensitivity
± 3 mm
Linear excursion
140 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
86.9
dB
Frequency response
75 - 6000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
120
Hz
Mechanical quality factor
QMS
4.24
Electrical quality factor
QES
1.11
Total quality factor
QTS
0.88
Large signal parameters
Maximum linear excursion
xmax
3.0
mm
Air volume displaced at xmax
VD
18
cm³
Power handling
P
70
W
Program power
Pmax
140
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.4
Ω
Inductance (1kHz, estimated)
LE
0.14
mH
VC Diameter
25
mm
Winding height
HVC
12
mm
Magnet
Force factor
Bl
4.1
N/A
Motor constant
Bl/√RE
2.22
N/√W
Diaphragm
Effective diameter
88
mm
Effective area
SD
61
cm²
Moving mass
MMS
5.9
g
Moving mass (without air load)
MMD
5.6
g
Suspensions
Stiffness
KMS
4.31
N/mm
Compliance
CMS
232
µm/N
Equivalent volume to the compliance
VAS
1.2
L
Mechanical resistance
RMS
1.19
N·s/m
Dimensions
Nominal diameter
4
″
100
mm
Overall diameter
102
mm
Baffle cutout diameter
92
mm
Mounting depth
47
mm
Volume occupied by the driver (estimated)
0.14
L
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SpeakerbenchSimilar speaker drivers to HELIX S 4B
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4″Full-range
fS
140 Hz
SD
44 cm²
140 - 20000 Hz
QTS
0.92
xmax
1.3 mm
SPL1W
87 dB
Bl/√RE
1.53
Pmax
70 W
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4″Full-range
fS
132 Hz
SD
54 cm²
110 - 18000 Hz
QTS
0.85
xmax
2.2 mm
SPL1W
87 dB
Bl/√RE
1.77
Pmax
80 W
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4″2 way kit
fS
140 Hz
SD
54 cm²
110 - 22000 Hz
QTS
0.90
xmax
2.3 mm
SPL1W
87 dB
Bl/√RE
1.97
Pmax
120 W