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
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
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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
Celestion CF1840JD SPL & Impedance

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