Oberton 12B401

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.8dB
• Frequency response 50 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 46.6Hz
• Mechanical quality factor QMS 13.93
• Electrical quality factor QES 0.25
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 6.8mm
• Air volume displaced at xmax VD 347cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 1.04mH
• VC Diameter 77mm
• Winding height HVC 18mm
• Winding material Copper
• Former material Kapton

Magnet

• Flux density B 1.3T
• Force factor Bl 20N/A
• Motor constant Bl/√RE 8.52N/√W
• Air gap height HAG 9mm
• Material Ferrite

Diaphragm

• Effective diameter 256mm
• Effective area SD 515cm²
• Moving mass MMS 61.9g
• Moving mass (without air load) MMD 53.5g
• Material Paper

Suspensions

• Stiffness KMS 5.32N/mm
• Compliance CMS 188µm/N
• Equivalent volume to the compliance VAS 69.6L
• Mechanical resistance RMS 1.3N·s/m

Dimensions

• Nominal diameter 12″
• 310mm
• Overall diameter 311mm
• Baffle cutout diameter 280mm
• Overall depth 145mm
• Volume occupied by the driver (estimated) 3L
• Net weight 7.25kg
• Frame material Die cast aluminium