Celestion FTR18-4080FDX

Low frequency

18″ / 457 mm
Nominal diameter
37 Hz
Resonance
0.41
Q factor
94 dB
Sensitivity
± 6 mm
Linear excursion
1600 W
Program Power
Discontinued
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
94.2
dB
Frequency response
30 - 1000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
37.3
Hz
Mechanical quality factor
QMS
10.25
Electrical quality factor
QES
0.43
Total quality factor
QTS
0.41

Large signal parameters

Maximum linear excursion
xmax
6.0
mm
Air volume displaced at xmax
VD
681
cm³
Power handling
P
800
W
Program power
Pmax
1600
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.6
Ω
Inductance (1kHz)
LE
1.52
mH
VC Diameter
100
mm
Winding height
HVC
22
mm
Winding material
Round copper
Former material
Glass fibre

Magnet

Force factor
Bl
25.12
N/A
Motor constant
Bl/√RE
10.6
N/√W
Air gap height
HAG
10
mm
Weight
3.1
kg
Material
Ferrite

Diaphragm

Effective diameter
380
mm
Effective area
SD
1134
cm²
Moving mass
MMS
206.4
g
Moving mass (without air load)
MMD
179
g
Material
Glass loaded paper (weather-resistant)

Suspensions

Stiffness
KMS
11.36
N/mm
Compliance
CMS
88
µm/N
Equivalent volume to the compliance
VAS
161
L
Mechanical resistance
RMS
4.716
N·s/m
Surround material
Cloth-sealed

Dimensions

Nominal diameter
18
457
mm
Overall diameter
462
mm
Baffle cutout diameter
416
mm
Overall depth
205
mm
Volume occupied by the driver (estimated)
5.9
L
Net weight
9.8
kg
Frame material
Cast aluminium
Celestion FTR18-4080FDX SPL & Impedance

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