Celestion CF1840JD
Low frequency
18″ / 457 mm
Nominal diameter
37 Hz
Resonance
0.4
Q factor
94 dB
Sensitivity
± 12.5 mm
Linear excursion
2400 W
Program Power
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
93.9
dB
Frequency response
30 - 2500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
37.0
Hz
Mechanical quality factor
QMS
4.37
Electrical quality factor
QES
0.44
Total quality factor
QTS
0.40
Large signal parameters
Maximum linear excursion
xmax
12.5
mm
Air volume displaced at xmax
VD
1418
cm³
Power handling
P
1200
W
Program power
Pmax
2400
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.3
Ω
Inductance (1kHz)
LE
1.16
mH
VC Diameter
100
mm
Winding height
HVC
30
mm
Winding material
Round copper
Former material
Glass fibre
Magnet
Force factor
Bl
24.76
N/A
Motor constant
Bl/√RE
10.8
N/√W
Air gap height
HAG
10
mm
Weight
3.18
kg
Material
Ferrite
Diaphragm
Effective diameter
380
mm
Effective area
SD
1134
cm²
Moving mass
MMS
217.4
g
Moving mass (without air load)
MMD
190.1
g
Material
Kevlar loaded paper
Suspensions
Stiffness
KMS
11.11
N/mm
Compliance
CMS
90
µm/N
Equivalent volume to the compliance
VAS
155
L
Mechanical resistance
RMS
11.56
N·s/m
Surround material
Cloth-sealed
Dimensions
Nominal diameter
18
″
457
mm
Overall diameter
460
mm
Baffle cutout diameter
414
mm
Overall depth
220
mm
Volume occupied by the driver (estimated)
6.9
L
Net weight
11.6
kg
Frame material
Cast aluminium
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fS
35 Hz
SD
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35 - 1000 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
11
Pmax
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15″Low frequency
fS
35 Hz
SD
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35 - 2000 Hz
QTS
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fS
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SD
1134 cm²
30 - 2500 Hz
QTS
0.41
xmax
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SPL1W
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Bl/√RE
11
Pmax
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