Oberton 8M150

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.2dB
• Frequency response 80 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 68.2Hz
• Mechanical quality factor QMS 6.07
• Electrical quality factor QES 0.23
• Total quality factor QTS 0.22

Large signal parameters

• Maximum linear excursion xmax 3.3mm
• Air volume displaced at xmax VD 66cm³
• Power handling P 150W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.1Ω
• Inductance (1kHz) LE 0.74mH
• VC Diameter 51mm
• Winding height HVC 10mm
• Winding material Aluminium
• Former material Kapton

Magnet

• Flux density B 1.35T
• Force factor Bl 11.6N/A
• Motor constant Bl/√RE 5.17N/√W
• Air gap height HAG 7mm
• Material Ferrite

Diaphragm

• Effective diameter 160mm
• Effective area SD 202cm²
• Moving mass MMS 14.1g
• Moving mass (without air load) MMD 11.8g
• Material Paper

Suspensions

• Stiffness KMS 2.58N/mm
• Compliance CMS 387µm/N
• Equivalent volume to the compliance VAS 21.6L
• Mechanical resistance RMS 0.99N·s/m

Dimensions

• Nominal diameter 8″
• 203mm
• Overall diameter 225mm
• Baffle cutout diameter 187mm
• Overall depth 90mm
• Volume occupied by the driver (estimated) 1.1L
• Net weight 3.25kg
• Frame material Die cast aluminium