15″ / 380 mm
Nominal diameter
40 Hz
Resonance
0.26
Q factor
98 dB
Sensitivity
± 4 mm
Linear excursion
600 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
98.1
dB
Frequency response
50 - 4800
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
40.0
Hz
Mechanical quality factor
QMS
3.95
Electrical quality factor
QES
0.27
Total quality factor
QTS
0.26
Large signal parameters
Maximum linear excursion
xmax
4.0
mm
Air volume displaced at xmax
VD
360
cm³
Power handling
P
400
W
Program power
Pmax
600
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.5
Ω
Inductance (1kHz)
LE
1.36
mH
VC Diameter
75
mm
Magnet
Force factor
Bl
20.0
N/A
Motor constant
Bl/√RE
8.53
N/√W
Diaphragm
Effective diameter
339
mm
Effective area
SD
900
cm²
Moving mass
MMS
77
g
Moving mass (without air load)
MMD
58.7
g
Material
Weather protected
Suspensions
Stiffness
KMS
4.85
N/mm
Compliance
CMS
206
µm/N
Equivalent volume to the compliance
VAS
210
L
Mechanical resistance
RMS
4.9
N·s/m
Dimensions
Nominal diameter
15
″
380
mm
Overall diameter
387
mm
Baffle cutout diameter
353
mm
Overall depth
167
mm
Flange thickness
19
mm
Mounting depth
148
mm
Volume occupied by the driver (estimated)
4.2
L
Net weight
8.3
kg
Similar subwoofers to Eighteen Sound 15MB650
15″Mid-range
fS
38 Hz
SD
853 cm²
40 - 5000 Hz
QTS
0.25
xmax
6.8 mm
SPL1W
98 dB
Bl/√RE
7.99
Pmax
900 W
15″Mid Bass
fS
42 Hz
SD
850 cm²
45 - 4300 Hz
QTS
0.29
xmax
5.5 mm
SPL1W
98 dB
Bl/√RE
7.87
Pmax
600 W
15″Subwoofer
fS
44 Hz
SD
900 cm²
44 - 4000 Hz
QTS
0.29
xmax
6.5 mm
SPL1W
98 dB
Bl/√RE
8.95
Pmax
600 W