Celestion FTR15-4080FD
Low frequency
15″ / 381 mm
Nominal diameter
35 Hz
Resonance
0.28
Q factor
95 dB
Sensitivity
± 8.5 mm
Linear excursion
2000 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.0
dB
Frequency response
35 - 2500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
35.4
Hz
Mechanical quality factor
QMS
3.91
Electrical quality factor
QES
0.30
Total quality factor
QTS
0.28
Large signal parameters
Maximum linear excursion
xmax
8.5
mm
Air volume displaced at xmax
VD
727
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
1.38
mH
VC Diameter
100
mm
Winding height
HVC
22
mm
Winding material
Round copper
Former material
Glass fibre
Magnet
Force factor
Bl
23.05
N/A
Motor constant
Bl/√RE
9.74
N/√W
Air gap height
HAG
10
mm
Weight
3.1
kg
Material
Ferrite
Diaphragm
Effective diameter
330
mm
Effective area
SD
855
cm²
Moving mass
MMS
127.2
g
Moving mass (without air load)
MMD
109.9
g
Material
Glass loaded paper (weather-resistant)
Suspensions
Stiffness
KMS
6.25
N/mm
Compliance
CMS
160
µm/N
Equivalent volume to the compliance
VAS
164
L
Mechanical resistance
RMS
7.24
N·s/m
Surround material
Cloth-sealed
Dimensions
Nominal diameter
15
″
381
mm
Overall diameter
385
mm
Baffle cutout diameter
351
mm
Overall depth
170
mm
Volume occupied by the driver (estimated)
4.6
L
Net weight
9.5
kg
Frame material
Cast aluminium
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18″Woofer
fS
35 Hz
SD
1158 cm²
30 - 250 Hz
QTS
0.29
xmax
12.5 mm
SPL1W
95 dB
Bl/√RE
13
Pmax
3200 W
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15″Woofer
fS
37 Hz
SD
830 cm²
35 - 1000 Hz
QTS
0.29
xmax
14.3 mm
SPL1W
95 dB
Bl/√RE
9.64
Pmax
1200 W
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15″Subwoofer
fS
38 Hz
SD
864 cm²
40 - 3150 Hz
QTS
0.27
xmax
11.3 mm
SPL1W
95 dB
Bl/√RE
10
Pmax
1400 W