Eighteen Sound 8M400F
Woofer
8″ / 210 mm
Nominal diameter
89 Hz
Resonance
0.26
Q factor
97 dB
Sensitivity
± 3 mm
Linear excursion
320 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
96.5
dB
Frequency response
200 - 9000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
89.0
Hz
Mechanical quality factor
QMS
4.03
Electrical quality factor
QES
0.28
Total quality factor
QTS
0.26
Large signal parameters
Maximum linear excursion
xmax
3.0
mm
Air volume displaced at xmax
VD
68
cm³
Power handling
P
250
W
Program power
Pmax
320
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.1
Ω
Inductance (1kHz)
LE
0.7
mH
VC Diameter
51
mm
Magnet
Force factor
Bl
13.1
N/A
Motor constant
Bl/√RE
5.8
N/√W
Diaphragm
Effective diameter
170
mm
Effective area
SD
227
cm²
Moving mass
MMS
16.9
g
Moving mass (without air load)
MMD
14.4
g
Suspensions
Stiffness
KMS
5.29
N/mm
Compliance
CMS
189
µm/N
Equivalent volume to the compliance
VAS
13.7
L
Mechanical resistance
RMS
2.35
N·s/m
Dimensions
Nominal diameter
8
″
210
mm
Overall diameter
210
mm
Baffle cutout diameter
186
mm
Overall depth
106
mm
Flange thickness
15
mm
Mounting depth
91
mm
Volume occupied by the driver (estimated)
1.5
L
Net weight
4.9
kg
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SpeakerbenchSimilar woofers to Eighteen Sound 8M400F
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10″Mid-range
fS
85 Hz
SD
350 cm²
70 - 4000 Hz
QTS
0.25
xmax
2.2 mm
SPL1W
97 dB
Bl/√RE
9.04
Pmax
700 W
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10″Mid-range
fS
71 Hz
SD
317 cm²
100 - 4000 Hz
QTS
0.21
xmax
5.3 mm
SPL1W
97 dB
Bl/√RE
8.52
Pmax
800 W
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