21″ / 540 mm
Nominal diameter
30 Hz
Resonance
0.34
Q factor
96 dB
Sensitivity
± 10 mm
Linear excursion
2800 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
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.9
dB
Frequency response
25 - 1800
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
30.0
Hz
Mechanical quality factor
QMS
7.40
Electrical quality factor
QES
0.36
Total quality factor
QTS
0.34
Large signal parameters
Maximum linear excursion
xmax
10.0
mm
Maximum excursion before damage
xlim
27.5
mm
Air volume displaced at xmax
VD
1734
cm³
Power handling
P
1400
W
Program power
Pmax
2800
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.2
Ω
Inductance (1kHz)
LE
1.3
mH
VC Diameter
100
mm
Winding height
HVC
25
mm
Magnet
Force factor
Bl
28.2
N/A
Motor constant
Bl/√RE
12.4
N/√W
Air gap height
HAG
12
mm
Diaphragm
Effective diameter
470
mm
Effective area
SD
1734
cm²
Moving mass
MMS
298
g
Moving mass (without air load)
MMD
248.7
g
Suspensions
Stiffness
KMS
10.64
N/mm
Compliance
CMS
94
µm/N
Equivalent volume to the compliance
VAS
402
L
Mechanical resistance
RMS
7.51
N·s/m
Dimensions
Nominal diameter
21
″
540
mm
Overall depth
79
mm
Volume occupied by the driver (estimated)
0.54
L
Net weight
19.9
kg
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fS
30 Hz
SD
1207 cm²
30 - 3150 Hz
QTS
0.35
xmax
9.3 mm
SPL1W
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Bl/√RE
8.41
Pmax
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21″Subwoofer
fS
30 Hz
SD
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25 - 1000 Hz
QTS
0.37
xmax
11.0 mm
SPL1W
95 dB
Bl/√RE
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Pmax
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fS
32 Hz
SD
1159 cm²
38 - 700 Hz
QTS
0.33
xmax
8.0 mm
SPL1W
97 dB
Bl/√RE
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Pmax
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