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
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
Discard
Apply
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
Celestion CF1840H SPL & Impedance

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