Oberton 8NMB250VCX
Coaxial
8″ / 210 mm
Nominal diameter
85 Hz
Resonance
0.16
Q factor
99 dB
Sensitivity
± 4.25 mm
Linear excursion
500 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
99.0
dB
Frequency response
85 - 20000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
85.2
Hz
Mechanical quality factor
QMS
7.24
Electrical quality factor
QES
0.17
Total quality factor
QTS
0.16
Large signal parameters
Maximum linear excursion
xmax
4.25
mm
Air volume displaced at xmax
VD
86
cm³
Power handling
P
250
W
Program power
Pmax
500
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.4
Ω
Inductance (1kHz)
LE
0.07
mH
VC Diameter
62
mm
Winding height
HVC
12
mm
Winding material
Aluminium
Former material
Glass fiber
Magnet
Flux density
B
1.55
T
Force factor
Bl
17.76
N/A
Motor constant
Bl/√RE
7.64
N/√W
Air gap height
HAG
7
mm
Material
Neodymium
Diaphragm
Effective diameter
160
mm
Effective area
SD
202
cm²
Moving mass
MMS
18.3
g
Moving mass (without air load)
MMD
16
g
Material
Paper with carbon fibers
Suspensions
Stiffness
KMS
5.24
N/mm
Compliance
CMS
191
µm/N
Equivalent volume to the compliance
VAS
10.7
L
Mechanical resistance
RMS
1.35
N·s/m
Dimensions
Nominal diameter
8
″
210
mm
Overall diameter
225
mm
Baffle cutout diameter
187
mm
Overall depth
162
mm
Volume occupied by the driver (estimated)
1.8
L
Net weight
3.88
kg
Frame material
Die Cast Aluminium
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SpeakerbenchSimilar speaker drivers to Oberton 8NMB250VCX
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8″Mid Bass
fS
74 Hz
SD
220 cm²
70 - 3000 Hz
QTS
0.17
xmax
6.0 mm
SPL1W
96 dB
Bl/√RE
8.29
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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8″Woofer
fS
69 Hz
SD
220 cm²
80 - 6000 Hz
QTS
0.18
xmax
5.0 mm
SPL1W
96 dB
Bl/√RE
7.25
Pmax
1000 W