8″ / 200 mm
Nominal diameter
73 Hz
Resonance
0.36
Q factor
94 dB
Sensitivity
± 6 mm
Linear excursion
400 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
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
93.8
dB
Frequency response
60 - 4500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
73.0
Hz
Mechanical quality factor
QMS
2.56
Electrical quality factor
QES
0.42
Total quality factor
QTS
0.36
Large signal parameters
Maximum linear excursion
xmax
6.0
mm
Air volume displaced at xmax
VD
138
cm³
Power handling
P
280
W
Program power
Pmax
400
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
2.6
Ω
Inductance (1kHz)
LE
0.34
mH
VC Diameter
51
mm
Magnet
Force factor
Bl
7.2
N/A
Motor constant
Bl/√RE
4.47
N/√W
Diaphragm
Effective diameter
171
mm
Effective area
SD
230
cm²
Moving mass
MMS
18
g
Moving mass (without air load)
MMD
15.5
g
Suspensions
Stiffness
KMS
3.79
N/mm
Compliance
CMS
264
µm/N
Equivalent volume to the compliance
VAS
18.4
L
Mechanical resistance
RMS
3.23
N·s/m
Dimensions
Nominal diameter
8
″
200
mm
Overall diameter
210
mm
Baffle cutout diameter
186
mm
Overall depth
99
mm
Flange thickness
14
mm
Mounting depth
85
mm
Volume occupied by the driver (estimated)
1.1
L
Net weight
3.4
kg
Similar woofers to Eighteen Sound 8MB500
8″Coaxial
fS
76 Hz
SD
202 cm²
70 - 20000 Hz
QTS
0.40
xmax
5.3 mm
SPL1W
94 dB
Bl/√RE
3.96
Pmax
400 W
8″Coaxial
fS
77 Hz
SD
202 cm²
70 - 20000 Hz
QTS
0.40
xmax
5.3 mm
SPL1W
94 dB
Bl/√RE
4.19
Pmax
400 W
8″Woofer
fS
76 Hz
SD
206 cm²
QTS
0.37
xmax
3.5 mm
SPL1W
95 dB
Bl/√RE
4.21
Pmax
260 W