Eighteen Sound 21NLW4000

4Ω
8Ω

Subwoofer

21″ / 533 mm
Nominal diameter
27 Hz
Resonance
0.38
Q factor
94 dB
Sensitivity
± 15 mm
Linear excursion
3200 W
Program Power
Eighteen Sound 21NLW4000 SubwooferEighteen Sound 21NLW4000 Subwoofer
Impedance
Excursion
Velocity
SPL
Phase
Group delay
Step response
Tone Burst
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply
Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.1
dB
Frequency response
30 - 1800
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
27.0
Hz
Mechanical quality factor
QMS
16.30
Electrical quality factor
QES
0.39
Total quality factor
QTS
0.38

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
4
Ω
DC resistance
RE
2.6
Ω
Inductance (1kHz)
LE
1.3
mH
VC Diameter
100
mm

Magnet

Force factor
Bl
20.0
N/A
Motor constant
Bl/√RE
12.4
N/√W
Material
Neodymium

Diaphragm

Effective diameter
460
mm
Effective area
SD
1660
cm²
Moving mass
MMS
355
g
Moving mass (without air load)
MMD
307.5
g
Material
Weather protected

Suspensions

Stiffness
KMS
10.2
N/mm
Compliance
CMS
98
µm/N
Equivalent volume to the compliance
VAS
380
L
Mechanical resistance
RMS
3.69
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
Impedance
SPL
Eighteen Sound 21NLW4000 Impedance
Eighteen Sound 21NLW4000 SPL
Eighteen Sound 21NLW4000 Dimensions
DatasheetDatasheet

Export this driver to a simulation software:

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fS
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SD
1241 cm²
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Bl/√RE
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Pmax
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SD
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Eighteen Sound 21NLW4000 8Ω Subwoofer
Eighteen Sound  21NLW4000 8Ω8 Ω
21″Subwoofer
fS
29 Hz
SD
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QTS
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xmax
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SPL1W
94 dB
Bl/√RE
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Pmax
3200 W

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