21″ / 533 mm
Nominal diameter
29 Hz
Resonance
0.37
Q factor
94 dB
Sensitivity
± 15 mm
Linear excursion
3200 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.4
dB
Frequency response
30 - 1800
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
29.0
Hz
Mechanical quality factor
QMS
22.00
Electrical quality factor
QES
0.38
Total quality factor
QTS
0.37
Large signal parameters
Maximum linear excursion
xmax
15.0
mm
Air volume displaced at xmax
VD
2490
cm³
Power handling
P
1600
W
Program power
Pmax
3200
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
4.9
Ω
Inductance (1kHz)
LE
2.8
mH
VC Diameter
100
mm
Winding material
Copper
Magnet
Force factor
Bl
30.0
N/A
Motor constant
Bl/√RE
13.6
N/√W
Material
Neodymium
Diaphragm
Effective diameter
460
mm
Effective area
SD
1660
cm²
Moving mass
MMS
380
g
Moving mass (without air load)
MMD
332.5
g
Material
Water,UV repellent
Suspensions
Stiffness
KMS
12.66
N/mm
Compliance
CMS
79
µm/N
Equivalent volume to the compliance
VAS
305
L
Mechanical resistance
RMS
3.15
N·s/m
Dimensions
Nominal diameter
21
″
533
mm
Overall diameter
545
mm
Baffle cutout diameter
492
mm
Overall depth
245
mm
Flange thickness
18
mm
Mounting depth
227
mm
Volume occupied by the driver (estimated)
8.2
L
Net weight
11.6
kg
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Export this driver to a simulation software:
WinISD
Basta!
Hornresp
QSpeakers
SpeakerSim
MfbLabs
SpeakerbenchSimilar subwoofers to Eighteen Sound 21NLW4000 8Ω
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21″Subwoofer
fS
29 Hz
SD
1660 cm²
30 - 1000 Hz
QTS
0.37
xmax
14.0 mm
SPL1W
94 dB
Bl/√RE
14
Pmax
3200 W
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21″Subwoofer
fS
27 Hz
SD
1660 cm²
35 - 1400 Hz
QTS
0.33
xmax
14.6 mm
SPL1W
94 dB
Bl/√RE
14
Pmax
3200 W