Eighteen Sound 21NLW9601C
Low frequency
21″ / 533 mm
Nominal diameter
38 Hz
Resonance
0.29
Q factor
95 dB
Sensitivity
± 14 mm
Linear excursion
3600 W
Program Power
Discontinued
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.4
dB
Frequency response
33 - 2000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
38.0
Hz
Mechanical quality factor
QMS
6.28
Electrical quality factor
QES
0.31
Total quality factor
QTS
0.29
Large signal parameters
Maximum linear excursion
xmax
14.0
mm
Maximum excursion before damage
xlim
35.0
mm
Air volume displaced at xmax
VD
2324
cm³
Power handling
P
1800
W
Program power
Pmax
3600
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
2.9
Ω
Inductance (1kHz)
LE
1.61
mH
VC Diameter
135
mm
Winding material
Copper
Magnet
Force factor
Bl
33.2
N/A
Motor constant
Bl/√RE
19.5
N/√W
Diaphragm
Effective diameter
460
mm
Effective area
SD
1660
cm²
Moving mass
MMS
484
g
Moving mass (without air load)
MMD
436.5
g
Material
Carbon Fiber
Suspensions
Stiffness
KMS
27.78
N/mm
Compliance
CMS
36
µm/N
Equivalent volume to the compliance
VAS
140
L
Mechanical resistance
RMS
18.4
N·s/m
Surround material
Heavy Polycotton
Dimensions
Nominal diameter
21
″
533
mm
Overall diameter
545
mm
Baffle cutout diameter
490
mm
Overall depth
250
mm
Flange thickness
18
mm
Mounting depth
232
mm
Volume occupied by the driver (estimated)
9.2
L
Net weight
13.6
kg
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SD
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SPL1W
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fS
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SD
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fS
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SD
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36 - 1000 Hz
QTS
0.31
xmax
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SPL1W
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Bl/√RE
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