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
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
Discard
Apply
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
Celestion FTR15-4080FD SPL & Impedance

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