Eighteen Sound 8CX650

Coaxial

8″ / 200 mm
Nominal diameter
65 Hz
Resonance
0.35
Q factor
93 dB
Sensitivity
± 6 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
Sensitivity (1W, 1m, infinite baffle)
SPL1W
92.7
dB
Frequency response
90 - 4700
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
65.0
Hz
Mechanical quality factor
QMS
6.40
Electrical quality factor
QES
0.37
Total quality factor
QTS
0.35

Large signal parameters

Maximum linear excursion
xmax
6.0
mm
Air volume displaced at xmax
VD
136
cm³
Power handling
P
200
W
Program power
Pmax
400
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
4.9
Ω
Inductance (1kHz)
LE
0.7
mH
VC Diameter
65
mm
Winding material
Edgewound Aluminum

Magnet

Force factor
Bl
12.0
N/A
Motor constant
Bl/√RE
5.42
N/√W

Diaphragm

Effective diameter
170
mm
Effective area
SD
227
cm²
Moving mass
MMS
25.6
g
Moving mass (without air load)
MMD
23.1
g

Suspensions

Stiffness
KMS
4.27
N/mm
Compliance
CMS
234
µm/N
Equivalent volume to the compliance
VAS
16.6
L
Mechanical resistance
RMS
1.63
N·s/m

Dimensions

Nominal diameter
8
200
mm
Overall diameter
210
mm
Baffle cutout diameter
185
mm
Overall depth
132
mm
Flange thickness
8
mm
Mounting depth
124
mm
Volume occupied by the driver (estimated)
1.9
L
Net weight
5.6
kg
Eighteen Sound 8CX650 Impedance
Eighteen Sound 8CX650 SPL
Eighteen Sound 8CX650 Directivity map
Eighteen Sound 8CX650 Dimensions

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fS
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SD
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65 - 3000 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
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Pmax
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