21″ / 533 mm
Nominal diameter
32 Hz
Resonance
0.31
Q factor
95 dB
Sensitivity
± 14 mm
Linear excursion
3600 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.0
dB
Frequency response
25 - 1500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
32.0
Hz
Mechanical quality factor
QMS
4.50
Electrical quality factor
QES
0.34
Total quality factor
QTS
0.31
Large signal parameters
Maximum linear excursion
xmax
14.0
mm
Air volume displaced at xmax
VD
2327
cm³
Power handling
P
1800
W
Program power
Pmax
3600
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.9
Ω
Inductance (1kHz)
LE
3.1
mH
VC Diameter
135
mm
Magnet
Force factor
Bl
37.0
N/A
Motor constant
Bl/√RE
15.2
N/√W
Material
Neodymium
Diaphragm
Effective diameter
460
mm
Effective area
SD
1662
cm²
Moving mass
MMS
390
g
Moving mass (without air load)
MMD
342.5
g
Material
Water,UV repellent
Suspensions
Stiffness
KMS
15.87
N/mm
Compliance
CMS
63
µm/N
Equivalent volume to the compliance
VAS
244
L
Mechanical resistance
RMS
17.43
N·s/m
Dimensions
Nominal diameter
21
″
533
mm
Overall diameter
545
mm
Baffle cutout diameter
492
mm
Overall depth
250
mm
Flange thickness
18
mm
Mounting depth
232
mm
Volume occupied by the driver (estimated)
9.1
L
Net weight
13.4
kg
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Export this driver to a simulation software:
WinISD
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Hornresp
QSpeakers
SpeakerSim
MfbLabs
SpeakerbenchSimilar subwoofers to Eighteen Sound 21NLW9001 8Ω
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21″Subwoofer
fS
32 Hz
SD
1700 cm²
30 - 1000 Hz
QTS
0.32
xmax
14.9 mm
SPL1W
95 dB
Bl/√RE
17
Pmax
4000 W
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18″Subwoofer
fS
30 Hz
SD
1210 cm²
35 - 1000 Hz
QTS
0.31
xmax
9.0 mm
SPL1W
94 dB
Bl/√RE
11
Pmax
2400 W
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