PRV Audio 21SW4000-NDY-2
Subwoofer
21″ / 547 mm
Nominal diameter
31 Hz
Resonance
0.28
Q factor
96 dB
Sensitivity
± 15 mm
Linear excursion
4000 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.9
dB
Frequency response
35 - 1200
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
30.8
Hz
Mechanical quality factor
QMS
12.33
Electrical quality factor
QES
0.28
Total quality factor
QTS
0.28
Large signal parameters
Maximum linear excursion
xmax
15.0
mm
Air volume displaced at xmax
VD
2886
cm³
Power handling
P
2000
W
Program power
Pmax
4000
W
Voice Coil
Nominal impedance
Z
2
Ω
DC resistance
RE
1.8
Ω
Inductance (1kHz)
LE
1.14
mH
VC Diameter
135
mm
Winding height
HVC
39
mm
Winding material
Copper
Former material
Glass Fiber
Magnet
Force factor
Bl
24.36
N/A
Motor constant
Bl/√RE
18.2
N/√W
Air gap height
HAG
18
mm
Material
Neodymium
Diaphragm
Effective diameter
495
mm
Effective area
SD
1924
cm²
Moving mass
MMS
485
g
Moving mass (without air load)
MMD
429.7
g
Suspensions
Stiffness
KMS
18.18
N/mm
Compliance
CMS
55
µm/N
Equivalent volume to the compliance
VAS
285
L
Mechanical resistance
RMS
7.61
N·s/m
Dimensions
Nominal diameter
21
″
547
mm
Overall diameter
547
mm
Baffle cutout diameter
508
mm
Overall depth
265
mm
Flange thickness
20
mm
Mounting depth
245
mm
Volume occupied by the driver (estimated)
9.6
L
Net weight
13.7
kg
Frame material
Die Cast Aluminum
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fS
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SD
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30 - 1000 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
16
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fS
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SD
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SD
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25 - 1000 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
11
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