Celestion CF1840H
Low frequency
18″ / 457 mm
Nominal diameter
39 Hz
Resonance
0.35
Q factor
96 dB
Sensitivity
± 8 mm
Linear excursion
2000 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.6
dB
Frequency response
30 - 2500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
38.5
Hz
Mechanical quality factor
QMS
3.92
Electrical quality factor
QES
0.39
Total quality factor
QTS
0.35
Large signal parameters
Maximum linear excursion
xmax
8.0
mm
Air volume displaced at xmax
VD
907
cm³
Power handling
P
1000
W
Program power
Pmax
2000
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.0
Ω
Inductance (1kHz)
LE
0.95
mH
VC Diameter
100
mm
Winding height
HVC
25
mm
Winding material
Round copper
Former material
Glass fibre
Magnet
Force factor
Bl
17.41
N/A
Motor constant
Bl/√RE
9.99
N/√W
Air gap height
HAG
9.5
mm
Weight
3.18
kg
Material
Ferrite
Diaphragm
Effective diameter
380
mm
Effective area
SD
1134
cm²
Moving mass
MMS
158.7
g
Moving mass (without air load)
MMD
131.4
g
Material
Carbon fibre loaded paper
Suspensions
Stiffness
KMS
9.09
N/mm
Compliance
CMS
110
µm/N
Equivalent volume to the compliance
VAS
197
L
Mechanical resistance
RMS
9.76
N·s/m
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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15″Subwoofer
fS
38 Hz
SD
850 cm²
38 - 3500 Hz
QTS
0.35
xmax
6.0 mm
SPL1W
96 dB
Bl/√RE
7.53
Pmax
1200 W
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18″Subwoofer
fS
37 Hz
SD
1210 cm²
37 - 2000 Hz
QTS
0.36
xmax
8.0 mm
SPL1W
95 dB
Bl/√RE
11
Pmax
2000 W
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18″Subwoofer
fS
36 Hz
SD
1255 cm²
40 - 1000 Hz
QTS
0.34
xmax
11.0 mm
SPL1W
96 dB
Bl/√RE
12
Pmax
2400 W