Celestion CF18VJD
Low frequency
18″ / 457 mm
Nominal diameter
35 Hz
Resonance
0.31
Q factor
94 dB
Sensitivity
± 12 mm
Linear excursion
3200 W
Program Power
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
93.9
dB
Frequency response
25 - 1500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
34.5
Hz
Mechanical quality factor
QMS
4.57
Electrical quality factor
QES
0.33
Total quality factor
QTS
0.31
Large signal parameters
Maximum linear excursion
xmax
12.0
mm
Air volume displaced at xmax
VD
1361
cm³
Power handling
P
1600
W
Program power
Pmax
3200
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.1
Ω
Inductance (1kHz)
LE
1.87
mH
VC Diameter
125
mm
Winding height
HVC
30
mm
Winding material
Round copper
Former material
Glass fibre
Magnet
Force factor
Bl
32.59
N/A
Motor constant
Bl/√RE
13.2
N/√W
Air gap height
HAG
12
mm
Weight
4.93
kg
Material
Ferrite
Diaphragm
Effective diameter
380
mm
Effective area
SD
1134
cm²
Moving mass
MMS
265.4
g
Moving mass (without air load)
MMD
238
g
Material
Carbon and kevlar loaded paper
Suspensions
Stiffness
KMS
12.5
N/mm
Compliance
CMS
80
µm/N
Equivalent volume to the compliance
VAS
146
L
Mechanical resistance
RMS
12.59
N·s/m
Surround material
Cloth-sealed
Dimensions
Nominal diameter
18
″
457
mm
Overall diameter
462
mm
Baffle cutout diameter
416
mm
Overall depth
233
mm
Volume occupied by the driver (estimated)
11.0
L
Net weight
23.0
kg
Frame material
Cast aluminium
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fS
34 Hz
SD
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35 - 1500 Hz
QTS
0.30
xmax
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SPL1W
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Bl/√RE
14
Pmax
3400 W
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fS
35 Hz
SD
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42 - 2000 Hz
QTS
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SPL1W
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Bl/√RE
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Pmax
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fS
37 Hz
SD
855 cm²
35 - 2000 Hz
QTS
0.35
xmax
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SPL1W
93 dB
Bl/√RE
10
Pmax
2400 W