Eighteen Sound 15NMB420
Subwoofer
15″ / 380 mm
Nominal diameter
42 Hz
Resonance
0.29
Q factor
99 dB
Sensitivity
± 6.5 mm
Linear excursion
700 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
99.4
dB
Frequency response
40 - 5000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
42.0
Hz
Mechanical quality factor
QMS
6.00
Electrical quality factor
QES
0.30
Total quality factor
QTS
0.29
Large signal parameters
Maximum linear excursion
xmax
6.5
mm
Air volume displaced at xmax
VD
585
cm³
Power handling
P
450
W
Program power
Pmax
700
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.6
Ω
Inductance (1kHz)
LE
0.8
mH
VC Diameter
75
mm
Winding material
Aluminum
Magnet
Force factor
Bl
19.0
N/A
Motor constant
Bl/√RE
8.03
N/√W
Material
Neodymium
Diaphragm
Effective diameter
339
mm
Effective area
SD
900
cm²
Moving mass
MMS
73
g
Moving mass (without air load)
MMD
54.7
g
Material
Weather protected
Suspensions
Stiffness
KMS
5.08
N/mm
Compliance
CMS
197
µm/N
Equivalent volume to the compliance
VAS
225
L
Mechanical resistance
RMS
3.21
N·s/m
Dimensions
Nominal diameter
15
″
380
mm
Overall diameter
387
mm
Baffle cutout diameter
353
mm
Overall depth
169
mm
Flange thickness
11
mm
Mounting depth
158
mm
Volume occupied by the driver (estimated)
2.6
L
Net weight
3.9
kg
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SD
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