Precision Devices PD.121
Woofer
12″ / 300 mm
Nominal diameter
53 Hz
Resonance
0.23
Q factor
97 dB
Sensitivity
± 2.7 mm
Linear excursion
600 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
97.0
dB
Frequency response
100 - 6000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
53.3
Hz
Mechanical quality factor
QMS
14.66
Electrical quality factor
QES
0.23
Total quality factor
QTS
0.23
Large signal parameters
Maximum linear excursion
xmax
2.7
mm
Air volume displaced at xmax
VD
143
cm³
Power handling
P
300
W
Program power
Pmax
600
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.9
Ω
Inductance (1kHz)
LE
0.42
mH
VC Diameter
63
mm
Winding height
HVC
12
mm
Winding material
Copper
Former material
Glass Fibre
Magnet
Flux density
B
1.5
T
Force factor
Bl
21.46
N/A
Motor constant
Bl/√RE
8.81
N/√W
Air gap height
HAG
9
mm
Material
Ceramic
Diaphragm
Effective diameter
260
mm
Effective area
SD
531
cm²
Moving mass
MMS
65.4
g
Moving mass (without air load)
MMD
56.3
g
Material
Paper
Suspensions
Stiffness
KMS
5.94
N/mm
Compliance
CMS
168
µm/N
Equivalent volume to the compliance
VAS
66.6
L
Mechanical resistance
RMS
1.49
N·s/m
Dimensions
Nominal diameter
12
″
300
mm
Overall diameter
330
mm
Baffle cutout diameter
282
mm
Overall depth
125
mm
Flange thickness
10
mm
Mounting depth
115
mm
Volume occupied by the driver (estimated)
3.3
L
Net weight
9.2
kg
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fS
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SD
531 cm²
45 - 2500 Hz
QTS
0.25
xmax
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SPL1W
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Bl/√RE
8.63
Pmax
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fS
50 Hz
SD
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xmax
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SPL1W
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fS
52 Hz
SD
522 cm²
50 - 3000 Hz
QTS
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xmax
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SPL1W
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