Eighteen Sound 8MB400
Woofer
8″ / 200 mm
Nominal diameter
64 Hz
Resonance
0.38
Q factor
93 dB
Sensitivity
± 5.8 mm
Linear excursion
400 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
93.1
dB
Frequency response
55 - 5200
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
64.0
Hz
Mechanical quality factor
QMS
3.23
Electrical quality factor
QES
0.43
Total quality factor
QTS
0.38
Large signal parameters
Maximum linear excursion
xmax
5.8
mm
Air volume displaced at xmax
VD
132
cm³
Power handling
P
280
W
Program power
Pmax
400
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.0
Ω
Inductance (1kHz)
LE
0.96
mH
VC Diameter
50
mm
Winding material
Aluminum
Magnet
Force factor
Bl
9.3
N/A
Motor constant
Bl/√RE
4.16
N/√W
Material
Ferrite
Diaphragm
Effective diameter
170
mm
Effective area
SD
227
cm²
Moving mass
MMS
18
g
Moving mass (without air load)
MMD
15.5
g
Material
Weather protected
Suspensions
Stiffness
KMS
2.91
N/mm
Compliance
CMS
344
µm/N
Equivalent volume to the compliance
VAS
23.9
L
Mechanical resistance
RMS
2.24
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)
1.2
L
Net weight
3.6
kg
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fS
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SD
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60 - 4000 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
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fS
56 Hz
SD
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65 - 6100 Hz
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0.34
xmax
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fS
62 Hz
SD
220 cm²
55 - 5000 Hz
QTS
0.38
xmax
5.5 mm
SPL1W
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Bl/√RE
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