Celestion FTR18-4080HDX

Low frequency

18″ / 457 mm
Nominal diameter
39 Hz
Resonance
0.43
Q factor
95 dB
Sensitivity
± 10.1 mm
Linear excursion
2000 W
Program Power
Celestion FTR18-4080HDX Low frequencyCelestion FTR18-4080HDX Low frequencyCelestion FTR18-4080HDX Low frequency
Impedance
Excursion
Velocity
SPL
Phase
Group delay
Step response
Tone Burst
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
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Specifications

Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.7
dB
Frequency response
30 - 2500
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
39.2
Hz
Mechanical quality factor
QMS
5.39
Electrical quality factor
QES
0.47
Total quality factor
QTS
0.43

Large signal parameters

Maximum linear excursion
xmax
10.1
mm
Air volume displaced at xmax
VD
1146
cm³
Power handling
P
1000
W
Program power
Pmax
2000
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.0
Ω
Inductance (1kHz)
LE
1.79
mH
VC Diameter
100
mm
Winding height
HVC
25
mm
Winding material
Round copper
Former material
Glass fibre

Magnet

Force factor
Bl
21.29
N/A
Motor constant
Bl/√RE
9.52
N/√W
Air gap height
HAG
9.5
mm
Weight
3.1
kg
Material
Ferrite

Diaphragm

Effective diameter
380
mm
Effective area
SD
1134
cm²
Moving mass
MMS
171.8
g
Moving mass (without air load)
MMD
144.9
g
Material
Glass loaded paper (weather-resistant)

Suspensions

Stiffness
KMS
10.0
N/mm
Compliance
CMS
100
µm/N
Equivalent volume to the compliance
VAS
175
L
Mechanical resistance
RMS
7.85
N·s/m
Surround material
Cloth-sealed

Dimensions

Nominal diameter
18
″
457
mm
Overall diameter
452
mm
Baffle cutout diameter
416
mm
Overall depth
205
mm
Volume occupied by the driver (estimated)
5.8
L
Net weight
9.8
kg
Frame material
Cast aluminium
SPL & Impedance
Celestion FTR18-4080HDX SPL & Impedance
Celestion FTR18-4080HDX Dimensions
DatasheetDatasheet

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