Celestion FTR18-4080F
Low frequency
18″ / 457 mm
Nominal diameter
33 Hz
Resonance
0.31
Q factor
96 dB
Sensitivity
± 6 mm
Linear excursion
1200 W
Program Power
Discontinued
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.7
dB
Frequency response
30 - 3000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
32.5
Hz
Mechanical quality factor
QMS
4.33
Electrical quality factor
QES
0.34
Total quality factor
QTS
0.31
Large signal parameters
Maximum linear excursion
xmax
6.0
mm
Air volume displaced at xmax
VD
681
cm³
Power handling
P
600
W
Program power
Pmax
1200
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.3
Ω
Inductance (1kHz)
LE
1.25
mH
VC Diameter
100
mm
Winding height
HVC
22
mm
Winding material
Round copper
Former material
Glass fibre
Magnet
Force factor
Bl
22.48
N/A
Motor constant
Bl/√RE
9.75
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
155.6
g
Moving mass (without air load)
MMD
128.7
g
Material
Glass loaded paper (weather-resistant)
Suspensions
Stiffness
KMS
6.67
N/mm
Compliance
CMS
150
µm/N
Equivalent volume to the compliance
VAS
281
L
Mechanical resistance
RMS
7.34
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
9.7
kg
Frame material
Cast aluminium
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15″Subwoofer
fS
33 Hz
SD
856 cm²
51 - 1700 Hz
QTS
0.32
xmax
4.8 mm
SPL1W
95 dB
Bl/√RE
7.62
Pmax
1600 W
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18″Subwoofer
fS
32 Hz
SD
1213 cm²
35 - 2500 Hz
QTS
0.30
xmax
11.3 mm
SPL1W
96 dB
Bl/√RE
11
Pmax
1400 W
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15″Woofer
fS
34 Hz
SD
856 cm²
45 - 1500 Hz
QTS
0.33
xmax
4.1 mm
SPL1W
96 dB
Bl/√RE
7.86
Pmax
1600 W