18″ / 457 mm
Nominal diameter
31 Hz
Resonance
0.34
Q factor
96 dB
Sensitivity
± 8.13 mm
Linear excursion
2400 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.6
dB
Frequency response
36 - 800
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
31.0
Hz
Mechanical quality factor
QMS
10.13
Electrical quality factor
QES
0.35
Total quality factor
QTS
0.34
Large signal parameters
Maximum linear excursion
xmax
8.13
mm
Maximum excursion before damage
xlim
20.2
mm
Air volume displaced at xmax
VD
942
cm³
Power handling
P
1200
W
Program power
Pmax
2400
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.1
Ω
Inductance (1kHz)
LE
1.09
mH
VC Diameter
102
mm
Winding material
Copper
Former material
Glass Fiber
Magnet
Force factor
Bl
16.1
N/A
Motor constant
Bl/√RE
9.1
N/√W
Air gap height
HAG
12.7
mm
Weight
3.09
kg
Material
Ferrite
Diaphragm
Effective diameter
384
mm
Effective area
SD
1159
cm²
Moving mass
MMS
148
g
Moving mass (without air load)
MMD
120.2
g
Material
Water resistant paper
Suspensions
Stiffness
KMS
5.88
N/mm
Compliance
CMS
170
µm/N
Equivalent volume to the compliance
VAS
317
L
Mechanical resistance
RMS
2.85
N·s/m
Surround material
Treated cloth
Dimensions
Nominal diameter
18
″
457
mm
Overall diameter
457
mm
Baffle cutout diameter
421
mm
Overall depth
211
mm
Volume occupied by the driver
6.7
L
Net weight
12.38
kg
Frame material
Die-cast aluminum
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fS
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SD
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50 - 2000 Hz
QTS
0.36
xmax
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SPL1W
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Bl/√RE
9.21
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fS
31 Hz
SD
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QTS
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Bl/√RE
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fS
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SD
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33 - 1000 Hz
QTS
0.36
xmax
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SPL1W
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Bl/√RE
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Pmax
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