Eighteen Sound 18NLW9601C
Low frequency
18″ / 462 mm
Nominal diameter
39 Hz
Resonance
0.34
Q factor
94 dB
Sensitivity
± 14 mm
Linear excursion
3600 W
Program Power
Discontinued
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
93.5
dB
Frequency response
30 - 2300
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
38.5
Hz
Mechanical quality factor
QMS
6.29
Electrical quality factor
QES
0.36
Total quality factor
QTS
0.34
Large signal parameters
Maximum linear excursion
xmax
14.0
mm
Maximum excursion before damage
xlim
35.0
mm
Air volume displaced at xmax
VD
1582
cm³
Power handling
P
1800
W
Program power
Pmax
3600
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
4.7
Ω
Inductance (1kHz)
LE
1.8
mH
VC Diameter
135
mm
Winding material
Aluminum
Magnet
Force factor
Bl
31.7
N/A
Motor constant
Bl/√RE
14.6
N/√W
Diaphragm
Effective diameter
379
mm
Effective area
SD
1130
cm²
Moving mass
MMS
314
g
Moving mass (without air load)
MMD
286.7
g
Material
Carbon Fiber
Suspensions
Stiffness
KMS
18.18
N/mm
Compliance
CMS
55
µm/N
Equivalent volume to the compliance
VAS
99
L
Mechanical resistance
RMS
12.08
N·s/m
Surround material
Heavy Polycotton
Dimensions
Nominal diameter
18
″
462
mm
Overall diameter
462
mm
Baffle cutout diameter
422
mm
Overall depth
236
mm
Flange thickness
26
mm
Mounting depth
210
mm
Volume occupied by the driver (estimated)
7.7
L
Net weight
12.8
kg
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SD
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SD
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