B&C Speaker 8FCX51

Coaxial

8″ / 210 mm
Nominal diameter
69 Hz
Resonance
0.34
Q factor
93 dB
Sensitivity
± 6.5 mm
Linear excursion
500 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

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Specifications

Sensitivity (1W, 1m, infinite baffle)
SPL1W
93.3
dB
Frequency response
70 - 18000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
69.0
Hz
Mechanical quality factor
QMS
6.30
Electrical quality factor
QES
0.36
Total quality factor
QTS
0.34

Large signal parameters

Maximum linear excursion
xmax
6.5
mm
Air volume displaced at xmax
VD
143
cm³
Power handling
P
250
W
Program power
Pmax
500
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
4.9
Ω
Inductance (1kHz)
LE
0.9
mH
VC Diameter
51
mm
Winding height
HVC
17.5
mm
Winding material
Aluminium
Former material
Glass Fibre

Magnet

Flux density
B
1.0
T
Force factor
Bl
11.5
N/A
Motor constant
Bl/√RE
5.2
N/√W
Air gap height
HAG
8
mm
Material
Ferrite

Diaphragm

Effective diameter
167
mm
Effective area
SD
220
cm²
Moving mass
MMS
22
g
Moving mass (without air load)
MMD
19.5
g
Material
Waterproof Front Side

Suspensions

Stiffness
KMS
4.22
N/mm
Compliance
CMS
237
µm/N
Equivalent volume to the compliance
VAS
16
L
Mechanical resistance
RMS
1.51
N·s/m

Dimensions

Nominal diameter
8
210
mm
Overall diameter
225
mm
Baffle cutout diameter
187
mm
Overall depth
118
mm
Flange thickness
10
mm
Mounting depth
108
mm
Volume occupied by the driver (estimated)
1.7
L
Net weight
5.0
kg
B&C Speaker 8FCX51 Impedance
B&C Speaker 8FCX51 SPL
B&C Speaker 8FCX51 Directivity
B&C Speaker 8FCX51 Directivity map HF
B&C Speaker 8FCX51 Directivity map LF
B&C Speaker 8FCX51 Dimensions

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