12″ / 300 mm
Nominal diameter
48 Hz
Resonance
0.23
Q factor
98 dB
Sensitivity
± 5.5 mm
Linear excursion
800 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
97.5
dB
Frequency response
45 - 5000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
48.0
Hz
Mechanical quality factor
QMS
3.20
Electrical quality factor
QES
0.24
Total quality factor
QTS
0.23
Large signal parameters
Maximum linear excursion
xmax
5.5
mm
Air volume displaced at xmax
VD
292
cm³
Power handling
P
400
W
Program power
Pmax
800
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.0
Ω
Inductance (1kHz)
LE
0.83
mH
VC Diameter
65
mm
Magnet
Force factor
Bl
19.0
N/A
Motor constant
Bl/√RE
7.76
N/√W
Diaphragm
Effective diameter
260
mm
Effective area
SD
531
cm²
Moving mass
MMS
48
g
Moving mass (without air load)
MMD
39.4
g
Material
Weather protected
Suspensions
Stiffness
KMS
4.37
N/mm
Compliance
CMS
229
µm/N
Equivalent volume to the compliance
VAS
90
L
Mechanical resistance
RMS
4.52
N·s/m
Dimensions
Nominal diameter
12
″
300
mm
Overall diameter
310
mm
Baffle cutout diameter
280
mm
Overall depth
143
mm
Flange thickness
14
mm
Mounting depth
129
mm
Volume occupied by the driver (estimated)
2.9
L
Net weight
6.8
kg
Similar subwoofers to Eighteen Sound 12MB650
12″Mid Bass
fS
50 Hz
SD
515 cm²
50 - 2500 Hz
QTS
0.25
xmax
5.3 mm
SPL1W
97 dB
Bl/√RE
7.81
Pmax
800 W
12″Coaxial
fS
46 Hz
SD
531 cm²
45 - 18000 Hz
QTS
0.22
xmax
6.0 mm
SPL1W
98 dB
Bl/√RE
8.04
Pmax
700 W
12″Coaxial
fS
46 Hz
SD
531 cm²
45 - 18000 Hz
QTS
0.22
xmax
6.0 mm
SPL1W
98 dB
Bl/√RE
8.04
Pmax
700 W