Celestion CF0820M
Low frequency
8″ / 200 mm
Nominal diameter
202 Hz
Resonance
0.57
Q factor
96 dB
Sensitivity
± 3.5 mm
Linear excursion
500 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.9
dB
Frequency response
150 - 6000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
202
Hz
Mechanical quality factor
QMS
1.78
Electrical quality factor
QES
0.83
Total quality factor
QTS
0.57
Large signal parameters
Maximum linear excursion
xmax
3.5
mm
Air volume displaced at xmax
VD
79
cm³
Power handling
P
250
W
Program power
Pmax
500
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.4
Ω
Inductance (1kHz)
LE
0.12
mH
VC Diameter
50
mm
Winding height
HVC
11
mm
Winding material
Copper clad aluminium
Former material
Glass fibre
Magnet
Force factor
Bl
13.27
N/A
Motor constant
Bl/√RE
5.72
N/√W
Air gap height
HAG
8
mm
Weight
1.3
kg
Material
Ferrite
Diaphragm
Effective diameter
170
mm
Effective area
SD
227
cm²
Moving mass
MMS
21.4
g
Moving mass (without air load)
MMD
18.8
g
Material
Treated paper
Suspensions
Stiffness
KMS
33.33
N/mm
Compliance
CMS
30
µm/N
Equivalent volume to the compliance
VAS
2.12
L
Mechanical resistance
RMS
15.21
N·s/m
Surround material
Cloth-sealed
Dimensions
Nominal diameter
8
″
200
mm
Overall diameter
215
mm
Baffle cutout diameter
187
mm
Overall depth
113
mm
Volume occupied by the driver (estimated)
1.2
L
Net weight
3.4
kg
Frame material
Cast aluminium
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6.5″Low frequency
fS
198 Hz
SD
154 cm²
300 - 7000 Hz
QTS
0.50
xmax
2.7 mm
SPL1W
96 dB
Bl/√RE
4.92
Pmax
400 W
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6.5″Mid-range
fS
172 Hz
SD
147 cm²
170 - 6000 Hz
QTS
0.57
xmax
3.0 mm
SPL1W
94 dB
Bl/√RE
4.68
Pmax
300 W
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6.5″Mid-range
fS
173 Hz
SD
143 cm²
150 - 6000 Hz
QTS
0.53
xmax
3.5 mm
SPL1W
95 dB
Bl/√RE
4.24
Pmax
240 W