Eighteen Sound 8NCX900
Coaxial
8″ / 210 mm
Nominal diameter
130 Hz
Resonance
0.26
Q factor
97 dB
Sensitivity
± 3.2 mm
Linear excursion
600 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
97.1
dB
Frequency response
100 - 23000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
130
Hz
Mechanical quality factor
QMS
8.00
Electrical quality factor
QES
0.27
Total quality factor
QTS
0.26
Large signal parameters
Maximum linear excursion
xmax
3.2
mm
Maximum excursion before damage
xlim
7.5
mm
Air volume displaced at xmax
VD
74
cm³
Power handling
P
300
W
Program power
Pmax
600
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
4.9
Ω
Inductance (1kHz)
LE
0.6
mH
VC Diameter
75
mm
Winding material
Copper Clad Aluminum
Magnet
Force factor
Bl
19.0
N/A
Motor constant
Bl/√RE
8.58
N/√W
Material
Neodymium
Diaphragm
Effective diameter
171
mm
Effective area
SD
230
cm²
Moving mass
MMS
25
g
Moving mass (without air load)
MMD
22.3
g
Material
Straight
Suspensions
Stiffness
KMS
18.87
N/mm
Compliance
CMS
53
µm/N
Equivalent volume to the compliance
VAS
4
L
Mechanical resistance
RMS
2.55
N·s/m
Surround material
Triple roll, Polycotton
Dimensions
Nominal diameter
8
″
210
mm
Overall diameter
225
mm
Baffle cutout diameter
184
mm
Overall depth
127
mm
Flange thickness
11
mm
Mounting depth
116
mm
Volume occupied by the driver (estimated)
1.7
L
Net weight
4.5
kg
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QSpeakers
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SpeakerbenchSimilar speaker drivers to Eighteen Sound 8NCX900
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6.5″Mid-range
fS
102 Hz
SD
132 cm²
140 - 7000 Hz
QTS
0.29
xmax
2.3 mm
SPL1W
93 dB
Bl/√RE
5.82
Pmax
350 W
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6.5″Mid-range
fS
102 Hz
SD
129 cm²
100 - 4000 Hz
QTS
0.29
xmax
3.9 mm
SPL1W
93 dB
Bl/√RE
5.37
Pmax
500 W
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6.5″Woofer
fS
103 Hz
SD
133 cm²
90 - 8000 Hz
QTS
0.28
xmax
3.8 mm
SPL1W
93 dB
Bl/√RE
6.05
Pmax
400 W