Celestion CF1830E
Low frequency
18″ / 457 mm
Nominal diameter
41 Hz
Resonance
0.34
Q factor
96 dB
Sensitivity
± 5 mm
Linear excursion
1400 W
Program Power
Discontinued
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.8
dB
Frequency response
30 - 2500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
40.5
Hz
Mechanical quality factor
QMS
4.37
Electrical quality factor
QES
0.37
Total quality factor
QTS
0.34
Large signal parameters
Maximum linear excursion
xmax
5.0
mm
Air volume displaced at xmax
VD
567
cm³
Power handling
P
700
W
Program power
Pmax
1400
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.3
Ω
Inductance (1kHz)
LE
3.24
mH
VC Diameter
75
mm
Winding height
HVC
18
mm
Winding material
Round Copper
Former material
Glass Fibre
Magnet
Force factor
Bl
24.6
N/A
Motor constant
Bl/√RE
10.7
N/√W
Air gap height
HAG
8
mm
Material
Ferrite
Diaphragm
Effective diameter
380
mm
Effective area
SD
1134
cm²
Moving mass
MMS
167.5
g
Moving mass (without air load)
MMD
140.2
g
Material
Glass Fibre
Suspensions
Stiffness
KMS
10.87
N/mm
Compliance
CMS
92
µm/N
Equivalent volume to the compliance
VAS
168
L
Mechanical resistance
RMS
9.33
N·s/m
Surround material
Cloth
Dimensions
Nominal diameter
18
″
457
mm
Overall diameter
460
mm
Baffle cutout diameter
414
mm
Overall depth
211
mm
Volume occupied by the driver (estimated)
6.8
L
Frame material
Cast Aluminium
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SD
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44 - 800 Hz
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SPL1W
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fS
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SD
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fS
36 Hz
SD
1134 cm²
35 - 2500 Hz
QTS
0.35
xmax
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SPL1W
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Bl/√RE
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