Oberton 8NM250 V2

Name: 8NM250 V2
Brand: Oberton

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

Sensitivity (1W, 1m, infinite baffle)
SPL_1W: 98.1; dB
Frequency response: 100 - 5000; Hz
Resonance frequency (free air)
f_S: 67.7; Hz
Mechanical quality factor
Q_MS: 13.94
Electrical quality factor
Q_ES: 0.26
Total quality factor
Q_TS: 0.25
Maximum linear excursion
x_max: 4.0; mm
Air volume displaced at x_max
V_D: 81; cm³
Power handling
P: 250; W
Program power
P_max: 500; W
Nominal impedance
Z: 16; Ω
DC resistance
R_E: 11.0; Ω
Inductance (1kHz)
L_E: 0.27; mH
VC Diameter: 64; mm
Winding height
H_VC: 10; mm
Winding material: Aluminium
Former material: Glass fiber
Flux density
B: 1.55; T
Force factor
Bl: 21.26; N/A
Motor constant
Bl/√R_E: 6.42; N/√W
Air gap height
H_AG: 7; mm
Material: Neodymium
Effective diameter: 160; mm
Effective area
S_D: 202; cm²
Moving mass
M_MS: 16.8; g
Moving mass (without air load)
M_MD: 14.6; g
Material: Paper with carbone fiber
Stiffness
K_MS: 6.66; N/mm
Compliance
C_MS: 150; µm/N
Equivalent volume to the compliance
V_AS: 8.39; L
Mechanical resistance
R_MS: 0.51; N·s/m
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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Oberton 8NM250 V2

Mid-range

Thiele & Small parameters

Large signal parameters

Voice Coil

Magnet

Diaphragm

Suspensions

Dimensions

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