Eighteen Sound 18NLTW4500
Subwoofer
18″ / 462 mm
Nominal diameter
35 Hz
Resonance
0.33
Q factor
94 dB
Sensitivity
± 15.3 mm
Linear excursion
3600 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.1
dB
Frequency response
30 - 1000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
35.0
Hz
Mechanical quality factor
QMS
9.70
Electrical quality factor
QES
0.34
Total quality factor
QTS
0.33
Large signal parameters
Maximum linear excursion
xmax
15.3
mm
Air volume displaced at xmax
VD
1836
cm³
Power handling
P
1800
W
Program power
Pmax
3600
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.0
Ω
Inductance (1kHz)
LE
2.0
mH
VC Diameter
115
mm
Magnet
Force factor
Bl
30.3
N/A
Motor constant
Bl/√RE
13.6
N/√W
Material
Neodymium
Diaphragm
Effective diameter
391
mm
Effective area
SD
1200
cm²
Moving mass
MMS
286
g
Moving mass (without air load)
MMD
256.9
g
Material
Weather protected
Suspensions
Stiffness
KMS
13.51
N/mm
Compliance
CMS
74
µm/N
Equivalent volume to the compliance
VAS
151
L
Mechanical resistance
RMS
6.48
N·s/m
Dimensions
Nominal diameter
18
″
462
mm
Overall diameter
462
mm
Baffle cutout diameter
422
mm
Overall depth
233
mm
Flange thickness
23
mm
Mounting depth
210
mm
Volume occupied by the driver (estimated)
7.3
L
Net weight
12.0
kg
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fS
35 Hz
SD
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30 - 1000 Hz
QTS
0.33
xmax
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SPL1W
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Bl/√RE
14
Pmax
3600 W
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fS
32 Hz
SD
1225 cm²
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fS
32 Hz
SD
1210 cm²
35 - 1500 Hz
QTS
0.30
xmax
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SPL1W
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