Oberton 15NMB500

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.3dB
• Frequency response 45 - 3500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 44.7Hz
• Mechanical quality factor QMS 12.40
• Electrical quality factor QES 0.30
• Total quality factor QTS 0.29

Large signal parameters

• Maximum linear excursion xmax 7.8mm
• Air volume displaced at xmax VD 643cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.1Ω
• Inductance (1kHz) LE 0.86mH
• VC Diameter 77mm
• Winding height HVC 21mm
• Winding material Aluminium
• Former material Kapton

Magnet

• Flux density B 1.2T
• Force factor Bl 21.3N/A
• Motor constant Bl/√RE 9.45N/√W
• Air gap height HAG 11mm
• Material Neodymium

Diaphragm

• Effective diameter 325mm
• Effective area SD 830cm²
• Moving mass MMS 95g
• Moving mass (without air load) MMD 78.1g
• Material Paper with Glass fiber

Suspensions

• Stiffness KMS 7.52N/mm
• Compliance CMS 133µm/N
• Equivalent volume to the compliance VAS 128L
• Mechanical resistance RMS 2.15N·s/m

Dimensions

• Nominal diameter 15″
• 388mm
• Overall diameter 388mm
• Baffle cutout diameter 355mm
• Overall depth 200mm
• Volume occupied by the driver (estimated) 3.5L
• Net weight 5.4kg
• Frame material Die Cast Aluminium