Oberton 12NMB35

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95dB
• Frequency response 50 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 54.4Hz
• Mechanical quality factor QMS 7.41
• Electrical quality factor QES 0.38
• Total quality factor QTS 0.36

Large signal parameters

• Maximum linear excursion xmax 6.8mm
• Air volume displaced at xmax VD 347cm³
• Power handling P 600W
• Program power Pmax 1200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 1.01mH
• VC Diameter 88mm
• Winding height HVC 19mm
• Winding material Aluminium
• Former material Glass fiber

Magnet

• Flux density B 1.05T
• Force factor Bl 17N/A
• Motor constant Bl/√RE 7.25N/√W
• Air gap height HAG 11mm
• Material Neodymium

Diaphragm

• Effective diameter 256mm
• Effective area SD 515cm²
• Moving mass MMS 58.3g
• Moving mass (without air load) MMD 49.8g
• Material Paper with Kevlar + glass fibers

Suspensions

• Stiffness KMS 6.81N/mm
• Compliance CMS 147µm/N
• Equivalent volume to the compliance VAS 54.3L
• Mechanical resistance RMS 2.69N·s/m

Dimensions

• Nominal diameter 12″
• 315mm
• Overall diameter 315mm
• Baffle cutout diameter 280mm
• Overall depth 156mm
• Volume occupied by the driver (estimated) 2.5L
• Net weight 5.05kg
• Frame material Die Cast Aluminium