21″ / 533 mm
Nominal diameter
34 Hz
Resonance
0.4
Q factor
94 dB
Sensitivity
± 15.2 mm
Linear excursion
3000 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.4
dB
Frequency response
32 - 300
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
34.0
Hz
Mechanical quality factor
QMS
7.80
Electrical quality factor
QES
0.42
Total quality factor
QTS
0.40
Large signal parameters
Maximum linear excursion
xmax
15.2
mm
Air volume displaced at xmax
VD
2525
cm³
Power handling
P
1500
W
Program power
Pmax
3000
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
2.6
Ω
Inductance (1kHz)
LE
1.5
mH
VC Diameter
100
mm
Winding height
HVC
36.5
mm
Winding material
Copper
Magnet
Force factor
Bl
22.8
N/A
Motor constant
Bl/√RE
14.1
N/√W
Air gap height
HAG
12.4
mm
Material
Neodymium
Diaphragm
Effective diameter
460
mm
Effective area
SD
1661
cm²
Moving mass
MMS
400
g
Moving mass (without air load)
MMD
352.5
g
Material
Water repellent
Suspensions
Stiffness
KMS
18.18
N/mm
Compliance
CMS
55
µm/N
Equivalent volume to the compliance
VAS
219
L
Mechanical resistance
RMS
10.96
N·s/m
Dimensions
Nominal diameter
21
″
533
mm
Overall diameter
545
mm
Baffle cutout diameter
492
mm
Overall depth
247
mm
Flange thickness
7
mm
Mounting depth
240
mm
Volume occupied by the driver (estimated)
7.7
L
Net weight
10.5
kg
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fS
35 Hz
SD
1340 cm²
35 - 1300 Hz
QTS
0.40
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SPL1W
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Bl/√RE
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Pmax
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18″Low frequency
fS
36 Hz
SD
1134 cm²
35 - 1000 Hz
QTS
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fS
36 Hz
SD
1661 cm²
32 - 300 Hz
QTS
0.46
xmax
15.2 mm
SPL1W
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Bl/√RE
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Pmax
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