Eighteen Sound 15NTLS3500
Subwoofer
15″ / 393 mm
Nominal diameter
28 Hz
Resonance
0.42
Q factor
90 dB
Sensitivity
± 15.3 mm
Linear excursion
1900 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
89.7
dB
Frequency response
30 - 2000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
28.0
Hz
Mechanical quality factor
QMS
8.20
Electrical quality factor
QES
0.44
Total quality factor
QTS
0.42
Large signal parameters
Maximum linear excursion
xmax
15.3
mm
Air volume displaced at xmax
VD
1348
cm³
Power handling
P
950
W
Program power
Pmax
1900
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.2
Ω
Inductance (1kHz)
LE
1.65
mH
VC Diameter
88
mm
Winding height
HVC
36
mm
Winding material
Copper
Magnet
Force factor
Bl
21.6
N/A
Motor constant
Bl/√RE
9.47
N/√W
Air gap height
HAG
11
mm
Material
Neodymium
Diaphragm
Effective diameter
335
mm
Effective area
SD
881
cm²
Moving mass
MMS
250
g
Moving mass (without air load)
MMD
231.8
g
Material
Weather protected
Suspensions
Stiffness
KMS
6.94
N/mm
Compliance
CMS
144
µm/N
Equivalent volume to the compliance
VAS
141
L
Mechanical resistance
RMS
5.36
N·s/m
Surround material
Rubber
Dimensions
Nominal diameter
15
″
393
mm
Overall diameter
393
mm
Baffle cutout diameter
357
mm
Overall depth
261
mm
Flange thickness
17
mm
Mounting depth
244
mm
Volume occupied by the driver (estimated)
5.6
L
Net weight
8.3
kg
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fS
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SD
1210 cm²
QTS
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xmax
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SPL1W
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Bl/√RE
15
Pmax
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fS
32 Hz
SD
1210 cm²
QTS
0.45
xmax
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SPL1W
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Bl/√RE
15
Pmax
9000 W