Precision Devices PD.2150
Subwoofer
21″ / 530 mm
Nominal diameter
30 Hz
Resonance
0.27
Q factor
96 dB
Sensitivity
± 10.5 mm
Linear excursion
2000 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.8
dB
Frequency response
30 - 1000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
29.5
Hz
Mechanical quality factor
QMS
14.21
Electrical quality factor
QES
0.28
Total quality factor
QTS
0.27
Large signal parameters
Maximum linear excursion
xmax
10.5
mm
Air volume displaced at xmax
VD
1783
cm³
Power handling
P
1000
W
Program power
Pmax
2000
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.5
Ω
Inductance (1kHz)
LE
2.1
mH
VC Diameter
152
mm
Winding height
HVC
30
mm
Winding material
Copper
Former material
Glass Fibre
Magnet
Flux density
B
1.1
T
Force factor
Bl
37.42
N/A
Motor constant
Bl/√RE
15.9
N/√W
Air gap height
HAG
15
mm
Material
Ceramic
Diaphragm
Effective diameter
465
mm
Effective area
SD
1698
cm²
Moving mass
MMS
382.9
g
Moving mass (without air load)
MMD
333.4
g
Material
Paper
Suspensions
Stiffness
KMS
13.09
N/mm
Compliance
CMS
76
µm/N
Equivalent volume to the compliance
VAS
309
L
Mechanical resistance
RMS
4.99
N·s/m
Surround material
Fabric
Dimensions
Nominal diameter
21
″
530
mm
Overall diameter
555
mm
Baffle cutout diameter
495
mm
Overall depth
230
mm
Flange thickness
15
mm
Mounting depth
215
mm
Volume occupied by the driver (estimated)
15.0
L
Net weight
31.75
kg
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fS
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SD
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xmax
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SD
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SD
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30 - 2500 Hz
QTS
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xmax
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