Eighteen Sound 15NCX910N

Beryllium
Titanium Nitride
Titanium

Coaxial

15″ / 380 mm
Nominal diameter
55 Hz
Resonance
0.33
Q factor
98 dB
Sensitivity
± 7 mm
Linear excursion
900 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
98.2
dB
Frequency response
50 - 4000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
55.0
Hz
Mechanical quality factor
QMS
8.20
Electrical quality factor
QES
0.34
Total quality factor
QTS
0.33

Large signal parameters

Maximum linear excursion
xmax
7.0
mm
Air volume displaced at xmax
VD
617
cm³
Power handling
P
450
W
Program power
Pmax
900
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.0
Ω
Inductance (1kHz)
LE
1.1
mH
VC Diameter
75
mm

Magnet

Force factor
Bl
21.0
N/A
Motor constant
Bl/√RE
9.39
N/√W

Diaphragm

Effective diameter
335
mm
Effective area
SD
881
cm²
Moving mass
MMS
86
g
Moving mass (without air load)
MMD
67.8
g

Suspensions

Stiffness
KMS
10.31
N/mm
Compliance
CMS
97
µm/N
Equivalent volume to the compliance
VAS
107
L
Mechanical resistance
RMS
3.62
N·s/m

Dimensions

Nominal diameter
15
380
mm
Overall diameter
393
mm
Baffle cutout diameter
360
mm
Overall depth
205
mm
Flange thickness
14
mm
Mounting depth
191
mm
Volume occupied by the driver (estimated)
4.1
L
Net weight
6.5
kg
Eighteen Sound 15NCX910N Impedance
Eighteen Sound 15NCX910N SPL
Eighteen Sound 15NCX910N Dimensions

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fS
55 Hz
SD
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40 - 20000 Hz
QTS
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xmax
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SPL1W
99 dB
Bl/√RE
9.93
Pmax
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