Oberton 8NM250 V2
Mid-range
8″ / 210 mm
Nominal diameter
68 Hz
Resonance
0.25
Q factor
98 dB
Sensitivity
± 4 mm
Linear excursion
500 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
98.1
dB
Frequency response
100 - 5000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
67.7
Hz
Mechanical quality factor
QMS
13.94
Electrical quality factor
QES
0.26
Total quality factor
QTS
0.25
Large signal parameters
Maximum linear excursion
xmax
4.0
mm
Air volume displaced at xmax
VD
81
cm³
Power handling
P
250
W
Program power
Pmax
500
W
Voice Coil
Nominal impedance
Z
16
Ω
DC resistance
RE
11.0
Ω
Inductance (1kHz)
LE
0.27
mH
VC Diameter
64
mm
Winding height
HVC
10
mm
Winding material
Aluminium
Former material
Glass fiber
Magnet
Flux density
B
1.55
T
Force factor
Bl
21.26
N/A
Motor constant
Bl/√RE
6.42
N/√W
Air gap height
HAG
7
mm
Material
Neodymium
Diaphragm
Effective diameter
160
mm
Effective area
SD
202
cm²
Moving mass
MMS
16.8
g
Moving mass (without air load)
MMD
14.6
g
Material
Paper with carbone fiber
Suspensions
Stiffness
KMS
6.66
N/mm
Compliance
CMS
150
µm/N
Equivalent volume to the compliance
VAS
8.39
L
Mechanical resistance
RMS
0.51
N·s/m
Dimensions
Nominal diameter
8
″
210
mm
Overall diameter
225
mm
Baffle cutout diameter
187
mm
Overall depth
84
mm
Volume occupied by the driver (estimated)
0.91
L
Net weight
2.7
kg
Frame material
Die cast aluminium
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SpeakerbenchSimilar woofers to Oberton 8NM250 V2
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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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