Eighteen Sound 21NTLW5000

Subwoofer

21″ / 533 mm
Nominal diameter
31 Hz
Resonance
0.36
Q factor
95 dB
Sensitivity
± 17.5 mm
Linear excursion
4000 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
94.7
dB
Frequency response
30 - 1800
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
31.0
Hz
Mechanical quality factor
QMS
5.20
Electrical quality factor
QES
0.38
Total quality factor
QTS
0.36

Large signal parameters

Maximum linear excursion
xmax
17.5
mm
Maximum excursion before damage
xlim
32.5
mm
Air volume displaced at xmax
VD
2909
cm³
Power handling
P
1800
W
Program power
Pmax
4000
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.3
Ω
Inductance (1kHz)
LE
1.6
mH
VC Diameter
115
mm
Winding material
Aluminum

Magnet

Force factor
Bl
32.0
N/A
Motor constant
Bl/√RE
13.9
N/√W
Material
Neodymium

Diaphragm

Effective diameter
460
mm
Effective area
SD
1662
cm²
Moving mass
MMS
372
g
Moving mass (without air load)
MMD
324.5
g
Material
Curvilinear paper composite, Water, UV repellent

Suspensions

Stiffness
KMS
14.49
N/mm
Compliance
CMS
69
µm/N
Equivalent volume to the compliance
VAS
270
L
Mechanical resistance
RMS
13.93
N·s/m
Surround material
Triple roll, Polycotton

Dimensions

Nominal diameter
21
533
mm
Overall diameter
545
mm
Baffle cutout diameter
490
mm
Overall depth
320
mm
Flange thickness
18
mm
Mounting depth
302
mm
Volume occupied by the driver (estimated)
10.0
L
Net weight
12.5
kg
Eighteen Sound 21NTLW5000 Impedance
Eighteen Sound 21NTLW5000 SPL

Export this driver to a simulation software:

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