Eighteen Sound 18NLS4000
Subwoofer
18″ / 462 mm
Nominal diameter
27 Hz
Resonance
0.35
Q factor
91 dB
Sensitivity
± 22.3 mm
Linear excursion
2400 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
91.4
dB
Frequency response
28 - 500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
27.0
Hz
Mechanical quality factor
QMS
13.70
Electrical quality factor
QES
0.36
Total quality factor
QTS
0.35
Large signal parameters
Maximum linear excursion
xmax
22.3
mm
Air volume displaced at xmax
VD
2732
cm³
Power handling
P
1200
W
Program power
Pmax
2400
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
2.9
Ω
Inductance (1kHz)
LE
2.6
mH
VC Diameter
100
mm
Winding height
HVC
52
mm
Magnet
Force factor
Bl
24.2
N/A
Motor constant
Bl/√RE
14.2
N/√W
Air gap height
HAG
15
mm
Diaphragm
Effective diameter
395
mm
Effective area
SD
1225
cm²
Moving mass
MMS
433
g
Moving mass (without air load)
MMD
403.3
g
Suspensions
Stiffness
KMS
12.5
N/mm
Compliance
CMS
80
µm/N
Equivalent volume to the compliance
VAS
168
L
Mechanical resistance
RMS
5.36
N·s/m
Dimensions
Nominal diameter
18
″
462
mm
Overall diameter
462
mm
Baffle cutout diameter
422
mm
Overall depth
250
mm
Flange thickness
24
mm
Mounting depth
226
mm
Volume occupied by the driver (estimated)
7.6
L
Net weight
12.0
kg
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SD
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