21″ / 530 mm
Nominal diameter
32 Hz
Resonance
0.3
Q factor
95 dB
Sensitivity
± 15 mm
Linear excursion
4000 W
Program Power
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Available on (affiliate link)
Parts Express
$$$
Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.2
dB
Frequency response
30 - 1000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
32.0
Hz
Mechanical quality factor
QMS
7.00
Electrical quality factor
QES
0.31
Total quality factor
QTS
0.30
Large signal parameters
Maximum linear excursion
xmax
15.0
mm
Air volume displaced at xmax
VD
2520
cm³
Power handling
P
2000
W
Program power
Pmax
4000
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.3
Ω
Inductance (1kHz)
LE
1.5
mH
VC Diameter
153
mm
Winding height
HVC
30
mm
Winding material
Copper
Former material
Glass Fibre
Magnet
Flux density
B
1.2
T
Force factor
Bl
32.5
N/A
Motor constant
Bl/√RE
17.9
N/√W
Air gap height
HAG
12
mm
Material
Neodymium Inside Slug
Diaphragm
Effective diameter
462
mm
Effective area
SD
1680
cm²
Moving mass
MMS
460
g
Moving mass (without air load)
MMD
411.8
g
Material
Waterproof Both Sides
Suspensions
Stiffness
KMS
20.0
N/mm
Compliance
CMS
50
µm/N
Equivalent volume to the compliance
VAS
200
L
Mechanical resistance
RMS
13.21
N·s/m
Spider material
Silicone
Dimensions
Nominal diameter
21
″
530
mm
Overall diameter
547
mm
Baffle cutout diameter
508
mm
Overall depth
261
mm
Flange thickness
16
mm
Mounting depth
245
mm
Volume occupied by the driver
16.0
L
Net weight
18.5
kg
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SD
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Bl/√RE
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SD
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