Oberton 12MB35

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.6dB
• Frequency response 50 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 51.4Hz
• Mechanical quality factor QMS 13.58
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.27

Large signal parameters

• Maximum linear excursion xmax 6.8mm
• Air volume displaced at xmax VD 347cm³
• Power handling P 700W
• Program power Pmax 1400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 0.68mH
• VC Diameter 88mm
• Winding height HVC 19mm
• Winding material Aluminium
• Former material Kapton

Magnet

• Flux density B 1.18T
• Force factor Bl 20.5N/A
• Motor constant Bl/√RE 9.17N/√W
• Air gap height HAG 11mm
• Material Ferrite

Diaphragm

• Effective diameter 256mm
• Effective area SD 515cm²
• Moving mass MMS 70.8g
• Moving mass (without air load) MMD 62.3g
• Material Paper

Suspensions

• Stiffness KMS 7.41N/mm
• Compliance CMS 135µm/N
• Equivalent volume to the compliance VAS 50.1L
• Mechanical resistance RMS 1.68N·s/m

Dimensions

• Nominal diameter 12″
• 315mm
• Overall diameter 315mm
• Baffle cutout diameter 280mm
• Overall depth 155mm
• Volume occupied by the driver (estimated) 3.5L
• Net weight 8.5kg
• Frame material Die cast aluminium