Eighteen Sound 21NLW9001

Subwoofer

21″ / 533 mm
Nominal diameter
31 Hz
Resonance
0.34
Q factor
95 dB
Sensitivity
± 14 mm
Linear excursion
3600 W
Program Power
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
94.6
dB
Frequency response
25 - 1500
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
31.0
Hz
Mechanical quality factor
QMS
4.54
Electrical quality factor
QES
0.37
Total quality factor
QTS
0.34

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
4
Ω
DC resistance
RE
2.9
Ω
Inductance (1kHz)
LE
2.2
mH
VC Diameter
135
mm

Magnet

Force factor
Bl
23.8
N/A
Motor constant
Bl/√RE
14.0
N/√W
Material
Neodymium

Diaphragm

Effective diameter
460
mm
Effective area
SD
1662
cm²
Moving mass
MMS
375
g
Moving mass (without air load)
MMD
327.5
g
Material
Weather protected

Suspensions

Stiffness
KMS
14.29
N/mm
Compliance
CMS
70
µm/N
Equivalent volume to the compliance
VAS
272
L
Mechanical resistance
RMS
16.09
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
Eighteen Sound 21NLW9001 Impedance
Eighteen Sound 21NLW9001 SPL
Eighteen Sound 21NLW9001 Dimensions

Export this driver to a simulation software:

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