Oberton 15MB500

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.5dB
• Frequency response 50 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 41.5Hz
• Mechanical quality factor QMS 12.85
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.34

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 5.3Ω
• Inductance (1kHz) LE 0.92mH
• VC Diameter 77mm
• Winding height HVC 21mm
• Winding material Aluminium
• Former material Kapton

Magnet

• Flux density B 1.2T
• Force factor Bl 18.5N/A
• Motor constant Bl/√RE 8.09N/√W
• Air gap height HAG 11mm
• Material Ferrite

Diaphragm

• Effective diameter 325mm
• Effective area SD 830cm²
• Moving mass MMS 87.5g
• Moving mass (without air load) MMD 70.6g
• Material Paper with glassfiber

Suspensions

• Stiffness KMS 5.95N/mm
• Compliance CMS 168µm/N
• Equivalent volume to the compliance VAS 162L
• Mechanical resistance RMS 1.78N·s/m

Dimensions

• Nominal diameter 15″
• 385mm
• Overall diameter 388mm
• Baffle cutout diameter 355mm
• Overall depth 172mm
• Volume occupied by the driver (estimated) 4.1L
• Net weight 7.8kg
• Frame material Die Cast Aluminium