Oberton 12NB400

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.7dB
• Frequency response 50 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 43.6Hz
• Mechanical quality factor QMS 10.39
• Electrical quality factor QES 0.18
• Total quality factor QTS 0.18

Large signal parameters

• Maximum linear excursion xmax 5.3mm
• Air volume displaced at xmax VD 270cm³
• Power handling P 450W
• Program power Pmax 900W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 0.83mH
• VC Diameter 77mm
• Winding height HVC 15mm
• Winding material Aluminium
• Former material Kapton

Magnet

• Flux density B 1.45T
• Force factor Bl 20.3N/A
• Motor constant Bl/√RE 9.1N/√W
• Air gap height HAG 9mm
• Material Neodymium

Diaphragm

• Effective diameter 256mm
• Effective area SD 515cm²
• Moving mass MMS 59.8g
• Moving mass (without air load) MMD 51.4g
• Material Paper with glassfiber

Suspensions

• Stiffness KMS 5.1N/mm
• Compliance CMS 196µm/N
• Equivalent volume to the compliance VAS 70.5L
• Mechanical resistance RMS 1.58N·s/m

Dimensions

• Nominal diameter 12″
• 315mm
• Overall diameter 315mm
• Baffle cutout diameter 280mm
• Overall depth 180mm
• Volume occupied by the driver (estimated) 2.8L
• Net weight 5.0kg
• Frame material Die Cast Aluminium