Eighteen Sound 8M400
Mid-range
8″ / 200 mm
Nominal diameter
90 Hz
Resonance
0.27
Q factor
97 dB
Sensitivity
± 3 mm
Linear excursion
320 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
97.2
dB
Frequency response
120 - 6100
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
90.0
Hz
Mechanical quality factor
QMS
6.20
Electrical quality factor
QES
0.28
Total quality factor
QTS
0.27
Large signal parameters
Maximum linear excursion
xmax
3.0
mm
Maximum excursion before damage
xlim
6.5
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
5.2
Ω
Inductance (1kHz)
LE
0.95
mH
VC Diameter
51
mm
Winding material
Aluminum
Magnet
Force factor
Bl
12.2
N/A
Motor constant
Bl/√RE
5.35
N/√W
Material
Ferrite
Diaphragm
Effective diameter
170
mm
Effective area
SD
227
cm²
Moving mass
MMS
14
g
Moving mass (without air load)
MMD
11.5
g
Material
Curvilinear, Paper
Suspensions
Stiffness
KMS
4.51
N/mm
Compliance
CMS
222
µm/N
Equivalent volume to the compliance
VAS
16.2
L
Mechanical resistance
RMS
1.28
N·s/m
Surround material
M-roll, Polycotton
Dimensions
Nominal diameter
8
″
200
mm
Overall diameter
210
mm
Baffle cutout diameter
184
mm
Overall depth
106
mm
Flange thickness
15
mm
Mounting depth
91
mm
Volume occupied by the driver (estimated)
1.4
L
Net weight
4.5
kg
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fS
76 Hz
SD
320 cm²
80 - 4000 Hz
QTS
0.21
xmax
1.5 mm
SPL1W
97 dB
Bl/√RE
8.14
Pmax
700 W
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10″Woofer
fS
70 Hz
SD
380 cm²
70 - 3500 Hz
QTS
0.22
xmax
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SPL1W
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Bl/√RE
8.77
Pmax
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fS
89 Hz
SD
227 cm²
200 - 9000 Hz
QTS
0.26
xmax
3.0 mm
SPL1W
97 dB
Bl/√RE
5.8
Pmax
320 W