Oberton 12B45V

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.9dB
• Frequency response 40 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 47.9Hz
• Mechanical quality factor QMS 7.37
• Electrical quality factor QES 0.37
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 10.5mm
• Air volume displaced at xmax VD 540cm³
• Power handling P 450W
• Program power Pmax 900W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 4.9Ω
• Inductance (1kHz) LE 0.733mH
• VC Diameter 77mm
• Winding height HVC 25mm
• Winding material Aluminium
• Former material Glass fiber

Magnet

• Flux density B 1.24T
• Force factor Bl 16.7N/A
• Motor constant Bl/√RE 7.52N/√W
• Air gap height HAG 8mm
• Material Ferrite

Diaphragm

• Effective diameter 256mm
• Effective area SD 515cm²
• Moving mass MMS 69.9g
• Moving mass (without air load) MMD 61.4g
• Material Paper with Kevlar fibers

Suspensions

• Stiffness KMS 6.32N/mm
• Compliance CMS 158µm/N
• Equivalent volume to the compliance VAS 58.5L
• Mechanical resistance RMS 2.85N·s/m

Dimensions

• Nominal diameter 12″
• 310mm
• Overall diameter 315mm
• Baffle cutout diameter 280mm
• Overall depth 158mm
• Volume occupied by the driver (estimated) 3.3L
• Net weight 7.65kg
• Frame material Die cast aluminium