B&C Speaker 8CX21

Coaxial

8″ / 210 mm
Nominal diameter
74 Hz
Resonance
0.36
Q factor
93 dB
Sensitivity
± 5 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
Discard
Apply

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Specifications

Sensitivity (1W, 1m, infinite baffle)
SPL1W
93.4
dB
Frequency response
75 - 20000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
74.0
Hz
Mechanical quality factor
QMS
4.10
Electrical quality factor
QES
0.39
Total quality factor
QTS
0.36

Large signal parameters

Maximum linear excursion
xmax
5.0
mm
Air volume displaced at xmax
VD
110
cm³
Power handling
P
200
W
Program power
Pmax
400
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.2
Ω
Inductance (1kHz)
LE
1.2
mH
VC Diameter
52
mm
Winding height
HVC
16
mm
Winding material
Copper
Former material
Kapton

Magnet

Flux density
B
1.1
T
Force factor
Bl
11.5
N/A
Motor constant
Bl/√RE
5.04
N/√W
Air gap height
HAG
8
mm
Material
Ferrite

Diaphragm

Effective diameter
167
mm
Effective area
SD
220
cm²
Moving mass
MMS
21
g
Moving mass (without air load)
MMD
18.5
g
Material
Waterproof Front Side

Suspensions

Stiffness
KMS
4.61
N/mm
Compliance
CMS
217
µm/N
Equivalent volume to the compliance
VAS
15
L
Mechanical resistance
RMS
2.38
N·s/m

Dimensions

Nominal diameter
8
210
mm
Overall diameter
225
mm
Baffle cutout diameter
187
mm
Overall depth
135
mm
Flange thickness
11
mm
Mounting depth
124
mm
Volume occupied by the driver (estimated)
1.6
L
Net weight
4.1
kg
B&C Speaker 8CX21 Impedance
B&C Speaker 8CX21 SPL 1
B&C Speaker 8CX21 SPL 2
B&C Speaker 8CX21 Directivity
B&C Speaker 8CX21 Directivity map HF
B&C Speaker 8CX21 Directivity map LF
B&C Speaker 8CX21 Dimensions

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