15″ / 393 mm
Nominal diameter
45 Hz
Resonance
0.39
Q factor
97 dB
Sensitivity
± 8.3 mm
Linear excursion
1800 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
Sensitivity (1w, 1m, infinite baffle)
SPL1W
97.0
dB
Frequency response
40 - 4000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
45.0
Hz
Mechanical quality factor
QMS
8.70
Electrical quality factor
QES
0.40
Total quality factor
QTS
0.39
Large signal parameters
Maximum linear excursion
xmax
8.3
mm
Air volume displaced at xmax
VD
731
cm³
Power handling
P
900
W
Program power
Pmax
1800
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.2
Ω
Inductance (1kHz)
LE
0.46
mH
VC Diameter
88
mm
Magnet
Force factor
Bl
19.5
N/A
Motor constant
Bl/√RE
8.55
N/√W
Diaphragm
Effective diameter
335
mm
Effective area
SD
881
cm²
Moving mass
MMS
106
g
Moving mass (without air load)
MMD
87.8
g
Material
Water,UV repellent
Suspensions
Stiffness
KMS
8.48
N/mm
Compliance
CMS
118
µm/N
Equivalent volume to the compliance
VAS
131
L
Mechanical resistance
RMS
3.44
N·s/m
Dimensions
Nominal diameter
15
″
393
mm
Overall diameter
393
mm
Baffle cutout diameter
357
mm
Overall depth
229
mm
Flange thickness
13
mm
Mounting depth
216
mm
Volume occupied by the driver (estimated)
3.8
L
Net weight
5.1
kg
Similar subwoofers to Eighteen Sound 15NTLW3500 8Ω
15″Low frequency
fS
47 Hz
SD
855 cm²
40 - 4000 Hz
QTS
0.41
xmax
4.8 mm
SPL1W
98 dB
Bl/√RE
7.94
Pmax
1100 W
15″Coaxial
fS
44 Hz
SD
829 cm²
50 - 16000 Hz
QTS
0.36
xmax
7.8 mm
SPL1W
96 dB
Bl/√RE
8.21
Pmax
900 W
15″Subwoofer
fS
46 Hz
SD
881 cm²
40 - 4000 Hz
QTS
0.40
xmax
8.3 mm
SPL1W
97 dB
Bl/√RE
8.97
Pmax
1800 W