Celestion FTR18-4080FD
Low frequency
18″ / 457 mm
Nominal diameter
25 Hz
Resonance
0.29
Q factor
94 dB
Sensitivity
± 8.5 mm
Linear excursion
2000 W
Program Power
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.4
dB
Frequency response
30 - 2500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
25.2
Hz
Mechanical quality factor
QMS
4.75
Electrical quality factor
QES
0.30
Total quality factor
QTS
0.29
Large signal parameters
Maximum linear excursion
xmax
8.5
mm
Air volume displaced at xmax
VD
964
cm³
Power handling
P
1000
W
Program power
Pmax
2000
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.6
Ω
Inductance (1kHz)
LE
1.5
mH
VC Diameter
100
mm
Winding height
HVC
22
mm
Winding material
Round copper
Former material
Glass fibre
Magnet
Force factor
Bl
22.81
N/A
Motor constant
Bl/√RE
9.62
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
177.8
g
Moving mass (without air load)
MMD
150.9
g
Material
Glass loaded paper (weather-resistant)
Suspensions
Stiffness
KMS
4.35
N/mm
Compliance
CMS
230
µm/N
Equivalent volume to the compliance
VAS
409
L
Mechanical resistance
RMS
5.92
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
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SD
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SPL1W
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SD
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