Oberton 8NMB250VCX

• Sensitivity (1W, 1m, infinite baffle) SPL1W 99dB
• Frequency response 85 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 85.2Hz
• Mechanical quality factor QMS 7.24
• Electrical quality factor QES 0.17
• Total quality factor QTS 0.16

Large signal parameters

• Maximum linear excursion xmax 4.3mm
• Air volume displaced at xmax VD 86cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.4Ω
• Inductance (1kHz) LE 0.068mH
• VC Diameter 62mm
• Winding height HVC 12mm
• Winding material Aluminium
• Former material Glass fiber

Magnet

• Flux density B 1.55T
• Force factor Bl 17.8N/A
• Motor constant Bl/√RE 7.64N/√W
• Air gap height HAG 7mm
• Material Neodymium

Diaphragm

• Effective diameter 160mm
• Effective area SD 202cm²
• Moving mass MMS 18.3g
• Moving mass (without air load) MMD 16g
• Material Paper with carbon fibers

Suspensions

• Stiffness KMS 5.24N/mm
• Compliance CMS 191µm/N
• Equivalent volume to the compliance VAS 10.7L
• Mechanical resistance RMS 1.35N·s/m

Dimensions

• Nominal diameter 8″
• 210mm
• Overall diameter 225mm
• Baffle cutout diameter 187mm
• Overall depth 162mm
• Volume occupied by the driver (estimated) 1.8L
• Net weight 3.88kg
• Frame material Die Cast Aluminium