Oberton 8M250
Mid-range
8″ / 203 mm
Nominal diameter
74 Hz
Resonance
0.2
Q factor
97 dB
Sensitivity
± 2.75 mm
Linear excursion
500 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
96.8
dB
Frequency response
90 - 5000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
74.4
Hz
Mechanical quality factor
QMS
14.01
Electrical quality factor
QES
0.20
Total quality factor
QTS
0.20
Large signal parameters
Maximum linear excursion
xmax
2.75
mm
Air volume displaced at xmax
VD
56
cm³
Power handling
P
250
W
Program power
Pmax
500
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.0
Ω
Inductance (1kHz)
LE
0.42
mH
VC Diameter
51
mm
Winding height
HVC
10
mm
Winding material
Aluminium
Former material
Kapton
Magnet
Flux density
B
1.43
T
Force factor
Bl
13.7
N/A
Motor constant
Bl/√RE
6.13
N/√W
Air gap height
HAG
9
mm
Material
Ferrite
Diaphragm
Effective diameter
160
mm
Effective area
SD
202
cm²
Moving mass
MMS
16.4
g
Moving mass (without air load)
MMD
14.1
g
Material
Paper with glassfiber
Suspensions
Stiffness
KMS
3.57
N/mm
Compliance
CMS
280
µm/N
Equivalent volume to the compliance
VAS
15.6
L
Mechanical resistance
RMS
0.55
N·s/m
Dimensions
Nominal diameter
8
″
203
mm
Overall diameter
225
mm
Baffle cutout diameter
187
mm
Overall depth
90
mm
Volume occupied by the driver (estimated)
1.3
L
Net weight
4.3
kg
Frame material
Die cast aluminium
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SpeakerbenchSimilar woofers to Oberton 8M250
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8″Mid-range
fS
84 Hz
SD
202 cm²
100 - 4000 Hz
QTS
0.20
xmax
2.8 mm
SPL1W
97 dB
Bl/√RE
6.49
Pmax
400 W
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8″Mid-range
fS
75 Hz
SD
214 cm²
90 - 5000 Hz
QTS
0.18
xmax
2.6 mm
SPL1W
97 dB
Bl/√RE
7.2
Pmax
400 W
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10″Mid Bass
fS
67 Hz
SD
320 cm²
65 - 3500 Hz
QTS
0.19
xmax
6.5 mm
SPL1W
96 dB
Bl/√RE
9.81
Pmax
800 W