Celestion CF0820BMB

Low frequency

8″ / 200 mm
Nominal diameter
51 Hz
Resonance
0.37
Q factor
90 dB
Sensitivity
± 7.25 mm
Linear excursion
500 W
Program Power
Celestion CF0820BMB Low frequencyCelestion CF0820BMB Low frequency
Impedance
Excursion
Velocity
SPL
Phase
Group delay
Step response
Tone Burst
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
90.2
dB
Frequency response
50 - 6000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
50.5
Hz
Mechanical quality factor
QMS
5.10
Electrical quality factor
QES
0.39
Total quality factor
QTS
0.37

Large signal parameters

Maximum linear excursion
xmax
7.25
mm
Air volume displaced at xmax
VD
165
cm³
Power handling
P
250
W
Program power
Pmax
500
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.5
Ω
Inductance (1kHz)
LE
0.78
mH
VC Diameter
50
mm
Winding height
HVC
18.5
mm
Winding material
Copper clad aluminium
Former material
Glass fibre

Magnet

Force factor
Bl
11.92
N/A
Motor constant
Bl/√RE
5.11
N/√W
Air gap height
HAG
8
mm
Weight
0.99
kg
Material
Ferrite

Diaphragm

Effective diameter
170
mm
Effective area
SD
227
cm²
Moving mass
MMS
32.4
g
Moving mass (without air load)
MMD
29.8
g
Material
Treated paper

Suspensions

Stiffness
KMS
3.23
N/mm
Compliance
CMS
310
µm/N
Equivalent volume to the compliance
VAS
22.4
L
Mechanical resistance
RMS
2.01
N·s/m
Surround material
Elastomer

Dimensions

Nominal diameter
8
″
200
mm
Overall diameter
215
mm
Baffle cutout diameter
187
mm
Overall depth
108
mm
Volume occupied by the driver (estimated)
1.1
L
Net weight
3.1
kg
Frame material
Cast aluminium
SPL & Impedance
Celestion CF0820BMB SPL & Impedance
DatasheetDatasheet

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