18″ / 457 mm
Nominal diameter
32 Hz
Resonance
0.4
Q factor
95 dB
Sensitivity
± 10.5 mm
Linear excursion
1800 W
Program Power
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.8
dB
Frequency response
30 - 300
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
32.0
Hz
Mechanical quality factor
QMS
8.42
Electrical quality factor
QES
0.42
Total quality factor
QTS
0.40
Large signal parameters
Maximum linear excursion
xmax
10.5
mm
Air volume displaced at xmax
VD
1220
cm³
Power handling
P
900
W
Program power
Pmax
1800
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.9
Ω
Inductance (1kHz)
LE
3.8
mH
VC Diameter
127
mm
Winding height
HVC
25
mm
Former material
Glass Fibre
Magnet
Flux density
B
0.96
T
Force factor
Bl
21.0
N/A
Motor constant
Bl/√RE
8.65
N/√W
Air gap height
HAG
9
mm
Weight
3.0
kg
Diaphragm
Effective diameter
385
mm
Effective area
SD
1162
cm²
Moving mass
MMS
157.2
g
Moving mass (without air load)
MMD
128.5
g
Suspensions
Stiffness
KMS
6.35
N/mm
Compliance
CMS
157
µm/N
Equivalent volume to the compliance
VAS
302
L
Mechanical resistance
RMS
3.75
N·s/m
Dimensions
Nominal diameter
18
″
457
mm
Overall diameter
474
mm
Baffle cutout diameter
414
mm
Overall depth
182
mm
Flange thickness
15
mm
Mounting depth
167
mm
Volume occupied by the driver (estimated)
6.7
L
Net weight
13.0
kg
Similar subwoofers to Precision Devices PD.185C001
18″Woofer
fS
28 Hz
SD
1241 cm²
26 - 2000 Hz
QTS
0.33
xmax
6.0 mm
SPL1W
95 dB
Bl/√RE
9.42
Pmax
1000 W
21″Subwoofer
fS
29 Hz
SD
1660 cm²
30 - 1800 Hz
QTS
0.37
xmax
15.0 mm
SPL1W
94 dB
Bl/√RE
14
Pmax
3200 W
21″Subwoofer
fS
28 Hz
SD
1700 cm²
28 - 1000 Hz
QTS
0.37
xmax
14.0 mm
SPL1W
95 dB
Bl/√RE
13
Pmax
4000 W