Eighteen Sound 21LW1400

Subwoofer

21″ / 533 mm
Nominal diameter
28 Hz
Resonance
0.24
Q factor
97 dB
Sensitivity
± 9.5 mm
Linear excursion
1600 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
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Specifications

Sensitivity (1W, 1m, infinite baffle)
SPL1W
96.9
dB
Frequency response
24 - 2000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
28.0
Hz
Mechanical quality factor
QMS
9.32
Electrical quality factor
QES
0.24
Total quality factor
QTS
0.24

Large signal parameters

Maximum linear excursion
xmax
9.5
mm
Air volume displaced at xmax
VD
1577
cm³
Power handling
P
1400
W
Program power
Pmax
1600
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.0
Ω
Inductance (1kHz)
LE
2.85
mH
VC Diameter
100
mm
Winding material
Copper

Magnet

Force factor
Bl
33.5
N/A
Motor constant
Bl/√RE
15.0
N/√W
Material
Ferrite

Diaphragm

Effective diameter
460
mm
Effective area
SD
1660
cm²
Moving mass
MMS
296
g
Moving mass (without air load)
MMD
248.5
g
Material
Weather protected

Suspensions

Stiffness
KMS
9.17
N/mm
Compliance
CMS
109
µm/N
Equivalent volume to the compliance
VAS
385
L
Mechanical resistance
RMS
5.59
N·s/m

Dimensions

Nominal diameter
21
533
mm
Overall diameter
545
mm
Baffle cutout diameter
492
mm
Overall depth
259
mm
Flange thickness
14
mm
Mounting depth
245
mm
Volume occupied by the driver (estimated)
11.0
L
Net weight
17.0
kg
Eighteen Sound 21LW1400 Impedance
Eighteen Sound 21LW1400 SPL
Eighteen Sound 21LW1400 Dimensions

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fS
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SD
1700 cm²
30 - 1000 Hz
QTS
0.26
xmax
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SPL1W
96 dB
Bl/√RE
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Pmax
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