Celestion FTX0820

Coaxial

8″ / 200 mm
Nominal diameter
79 Hz
Resonance
0.28
Q factor
95 dB
Sensitivity
± 4 mm
Linear excursion
400 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
94.6
dB
Frequency response
70 - 20000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
78.8
Hz
Mechanical quality factor
QMS
2.80
Electrical quality factor
QES
0.31
Total quality factor
QTS
0.28

Large signal parameters

Maximum linear excursion
xmax
4.0
mm
Air volume displaced at xmax
VD
91
cm³
Power handling
P
200
W
Program power
Pmax
400
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.9
Ω
Inductance (1kHz)
LE
0.62
mH
VC Diameter
50
mm
Winding height
HVC
12
mm
Winding material
Edgewound copper
Former material
Glass fibre

Magnet

Force factor
Bl
14.56
N/A
Motor constant
Bl/√RE
6.02
N/√W
Air gap height
HAG
8
mm
Weight
1.5
kg
Material
Ferrite

Diaphragm

Effective diameter
170
mm
Effective area
SD
227
cm²
Moving mass
MMS
22.7
g
Moving mass (without air load)
MMD
20
g
Material
Kevlar loaded paper

Suspensions

Stiffness
KMS
5.56
N/mm
Compliance
CMS
180
µm/N
Equivalent volume to the compliance
VAS
13.1
L
Mechanical resistance
RMS
4.01
N·s/m
Surround material
Cloth-sealed

Dimensions

Nominal diameter
8
200
mm
Overall diameter
225
mm
Baffle cutout diameter
187
mm
Overall depth
123
mm
Volume occupied by the driver (estimated)
1.5
L
Net weight
4.1
kg
Frame material
Cast aluminium
Celestion FTX0820 SPL & Impedance

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