Eighteen Sound 12NMB420
Woofer
12″ / 300 mm
Nominal diameter
53 Hz
Resonance
0.28
Q factor
101 dB
Sensitivity
± 4 mm
Linear excursion
450 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
101.1
dB
Frequency response
55 - 6000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
53.0
Hz
Mechanical quality factor
QMS
3.60
Electrical quality factor
QES
0.30
Total quality factor
QTS
0.28
Large signal parameters
Maximum linear excursion
xmax
4.0
mm
Air volume displaced at xmax
VD
212
cm³
Power handling
P
300
W
Program power
Pmax
450
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.2
Ω
Inductance (1kHz)
LE
0.2
mH
VC Diameter
65
mm
Winding material
Aluminum
Magnet
Force factor
Bl
13.9
N/A
Motor constant
Bl/√RE
6.1
N/√W
Material
Neodymium
Diaphragm
Effective diameter
260
mm
Effective area
SD
531
cm²
Moving mass
MMS
33.5
g
Moving mass (without air load)
MMD
24.7
g
Material
Weather protected
Suspensions
Stiffness
KMS
3.72
N/mm
Compliance
CMS
269
µm/N
Equivalent volume to the compliance
VAS
105
L
Mechanical resistance
RMS
3.1
N·s/m
Dimensions
Nominal diameter
12
″
300
mm
Overall diameter
315
mm
Baffle cutout diameter
282
mm
Overall depth
127
mm
Flange thickness
11
mm
Mounting depth
116
mm
Volume occupied by the driver (estimated)
1.6
L
Net weight
3.0
kg
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fS
50 Hz
SD
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55 - 6000 Hz
QTS
0.27
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SPL1W
101 dB
Bl/√RE
6.31
Pmax
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SD
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QTS
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xmax
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SD
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40 - 3000 Hz
QTS
0.24
xmax
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SPL1W
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