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
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
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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
Celestion FTR15-3070C SPL & Impedance

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