Eighteen Sound 18LW1251
Subwoofer
18″ / 460 mm
Nominal diameter
35 Hz
Resonance
0.27
Q factor
97 dB
Sensitivity
± 9 mm
Linear excursion
1400 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
96.9
dB
Frequency response
35 - 3500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
35.0
Hz
Mechanical quality factor
QMS
8.00
Electrical quality factor
QES
0.28
Total quality factor
QTS
0.27
Large signal parameters
Maximum linear excursion
xmax
9.0
mm
Air volume displaced at xmax
VD
1021
cm³
Power handling
P
1000
W
Program power
Pmax
1400
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.0
Ω
Inductance (1kHz)
LE
2.73
mH
VC Diameter
100
mm
Magnet
Force factor
Bl
23.6
N/A
Motor constant
Bl/√RE
10.6
N/√W
Material
Ferrite
Diaphragm
Effective diameter
380
mm
Effective area
SD
1134
cm²
Moving mass
MMS
142
g
Moving mass (without air load)
MMD
114.6
g
Material
Weather protected
Suspensions
Stiffness
KMS
6.85
N/mm
Compliance
CMS
146
µm/N
Equivalent volume to the compliance
VAS
268
L
Mechanical resistance
RMS
3.9
N·s/m
Spider material
Double Silicon
Dimensions
Nominal diameter
18
″
460
mm
Overall diameter
462
mm
Baffle cutout diameter
416
mm
Overall depth
207
mm
Flange thickness
19
mm
Mounting depth
188
mm
Volume occupied by the driver (estimated)
7.1
L
Net weight
13.0
kg
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SD
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SD
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