Precision Devices PD.1851/2
Subwoofer
18″ / 460 mm
Nominal diameter
37 Hz
Resonance
0.26
Q factor
96 dB
Sensitivity
± 12 mm
Linear excursion
2000 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
96.4
dB
Frequency response
35 - 2000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
37.0
Hz
Mechanical quality factor
QMS
18.49
Electrical quality factor
QES
0.27
Total quality factor
QTS
0.26
Large signal parameters
Maximum linear excursion
xmax
12.0
mm
Air volume displaced at xmax
VD
1397
cm³
Power handling
P
1000
W
Program power
Pmax
2000
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.2
Ω
Inductance (1kHz)
LE
1.04
mH
VC Diameter
127
mm
Winding height
HVC
29
mm
Winding material
Copper
Former material
Glass Fibre
Magnet
Flux density
B
1.18
T
Force factor
Bl
31.48
N/A
Motor constant
Bl/√RE
13.8
N/√W
Air gap height
HAG
12
mm
Material
Ceramic
Diaphragm
Effective diameter
385
mm
Effective area
SD
1164
cm²
Moving mass
MMS
219.2
g
Moving mass (without air load)
MMD
190.4
g
Material
Paper
Suspensions
Stiffness
KMS
11.86
N/mm
Compliance
CMS
84
µm/N
Equivalent volume to the compliance
VAS
160
L
Mechanical resistance
RMS
2.76
N·s/m
Dimensions
Nominal diameter
18
″
460
mm
Overall diameter
474
mm
Baffle cutout diameter
415
mm
Overall depth
193
mm
Flange thickness
15
mm
Mounting depth
178
mm
Volume occupied by the driver (estimated)
10.0
L
Net weight
24.8
kg
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fS
38 Hz
SD
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38 - 2500 Hz
QTS
0.27
xmax
7.3 mm
SPL1W
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Bl/√RE
10.0
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fS
35 Hz
SD
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40 - 4100 Hz
QTS
0.24
xmax
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SPL1W
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Bl/√RE
10
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15″Subwoofer
fS
39 Hz
SD
850 cm²
50 - 3000 Hz
QTS
0.26
xmax
8.0 mm
SPL1W
97 dB
Bl/√RE
9.96
Pmax
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