Precision Devices PD.123ER
Woofer
12″ / 300 mm
Nominal diameter
56 Hz
Resonance
0.29
Q factor
98 dB
Sensitivity
± 2.5 mm
Linear excursion
800 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
98.1
dB
Frequency response
50 - 5000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
55.9
Hz
Mechanical quality factor
QMS
13.03
Electrical quality factor
QES
0.30
Total quality factor
QTS
0.29
Large signal parameters
Maximum linear excursion
xmax
2.5
mm
Air volume displaced at xmax
VD
133
cm³
Power handling
P
400
W
Program power
Pmax
800
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.7
Ω
Inductance (1kHz)
LE
0.25
mH
VC Diameter
76
mm
Winding height
HVC
13
mm
Winding material
Copper
Former material
Glass Fibre
Magnet
Flux density
B
1.35
T
Force factor
Bl
21.73
N/A
Motor constant
Bl/√RE
8.37
N/√W
Air gap height
HAG
9
mm
Material
Ceramic
Diaphragm
Effective diameter
260
mm
Effective area
SD
531
cm²
Moving mass
MMS
58.9
g
Moving mass (without air load)
MMD
49.8
g
Material
Paper
Suspensions
Stiffness
KMS
7.25
N/mm
Compliance
CMS
138
µm/N
Equivalent volume to the compliance
VAS
54.5
L
Mechanical resistance
RMS
1.59
N·s/m
Dimensions
Nominal diameter
12
″
300
mm
Overall diameter
330
mm
Baffle cutout diameter
282
mm
Overall depth
127
mm
Flange thickness
10
mm
Mounting depth
117
mm
Volume occupied by the driver (estimated)
3.4
L
Net weight
9.5
kg
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fS
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SD
531 cm²
50 - 4000 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
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Pmax
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fS
55 Hz
SD
531 cm²
50 - 4600 Hz
QTS
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xmax
7.0 mm
SPL1W
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Bl/√RE
8.41
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fS
50 Hz
SD
515 cm²
60 - 18000 Hz
QTS
0.25
xmax
4.5 mm
SPL1W
98 dB
Bl/√RE
7.81
Pmax
800 W