Celestion FTR15-3070C
Low frequency
15″ / 381 mm
Nominal diameter
41 Hz
Resonance
0.38
Q factor
97 dB
Sensitivity
± 5.5 mm
Linear excursion
800 W
Program Power
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
97.4
dB
Frequency response
40 - 4000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
41.4
Hz
Mechanical quality factor
QMS
3.51
Electrical quality factor
QES
0.43
Total quality factor
QTS
0.38
Large signal parameters
Maximum linear excursion
xmax
5.5
mm
Air volume displaced at xmax
VD
470
cm³
Power handling
P
400
W
Program power
Pmax
800
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.1
Ω
Inductance (1kHz)
LE
0.59
mH
VC Diameter
75
mm
Winding height
HVC
16
mm
Winding material
Round copper
Former material
Glass fibre
Magnet
Force factor
Bl
17.33
N/A
Motor constant
Bl/√RE
7.03
N/√W
Air gap height
HAG
10
mm
Weight
2.3
kg
Material
Ferrite
Diaphragm
Effective diameter
330
mm
Effective area
SD
855
cm²
Moving mass
MMS
81.7
g
Moving mass (without air load)
MMD
64.4
g
Material
Glass loaded paper (weather-resistant)
Suspensions
Stiffness
KMS
5.56
N/mm
Compliance
CMS
180
µm/N
Equivalent volume to the compliance
VAS
188
L
Mechanical resistance
RMS
6.05
N·s/m
Surround material
Cloth-sealed
Dimensions
Nominal diameter
15
″
381
mm
Overall diameter
385
mm
Baffle cutout diameter
351
mm
Overall depth
158
mm
Volume occupied by the driver (estimated)
3.3
L
Net weight
6.3
kg
Frame material
Cast aluminium
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15″Coaxial
fS
40 Hz
SD
880 cm²
40 - 20000 Hz
QTS
0.36
xmax
6.0 mm
SPL1W
97 dB
Bl/√RE
7.4
Pmax
800 W
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15″Low frequency
fS
41 Hz
SD
855 cm²
45 - 3500 Hz
QTS
0.37
xmax
4.8 mm
SPL1W
97 dB
Bl/√RE
7.57
Pmax
1000 W
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15″Subwoofer
fS
39 Hz
SD
850 cm²
50 - 4300 Hz
QTS
0.37
xmax
8.0 mm
SPL1W
96 dB
Bl/√RE
7.79
Pmax
1200 W