Oberton 8M250

Name: Oberton 8M250
Brand: Oberton

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

Sensitivity (1W, 1m, infinite baffle)
SPL_1W: 96.8; dB
Frequency response: 90 - 5000; Hz
Resonance frequency (free air)
f_S: 74.4; Hz
Mechanical quality factor
Q_MS: 14.01
Electrical quality factor
Q_ES: 0.20
Total quality factor
Q_TS: 0.20
Maximum linear excursion
x_max: 2.75; mm
Air volume displaced at x_max
V_D: 56; cm³
Power handling
P: 250; W
Program power
P_max: 500; W
Nominal impedance
Z: 8; Ω
DC resistance
R_E: 5.0; Ω
Inductance (1kHz)
L_E: 0.42; mH
VC Diameter: 51; mm
Winding height
H_VC: 10; mm
Winding material: Aluminium
Former material: Kapton
Flux density
B: 1.43; T
Force factor
Bl: 13.7; N/A
Motor constant
Bl/√R_E: 6.13; N/√W
Air gap height
H_AG: 9; mm
Material: Ferrite
Effective diameter: 160; mm
Effective area
S_D: 202; cm²
Moving mass
M_MS: 16.4; g
Moving mass (without air load)
M_MD: 14.1; g
Material: Paper with glassfiber
Stiffness
K_MS: 3.57; N/mm
Compliance
C_MS: 280; µm/N
Equivalent volume to the compliance
V_AS: 15.6; L
Mechanical resistance
R_MS: 0.55; N·s/m
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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Oberton 8M250

Mid-range

Thiele & Small parameters

Large signal parameters

Voice Coil

Magnet

Diaphragm

Suspensions

Dimensions

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