Oberton 15NMB35

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.2dB
• Frequency response 45 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 38.9Hz
• Mechanical quality factor QMS 8.88
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 6.8mm
• Air volume displaced at xmax VD 560cm³
• Power handling P 600W
• Program power Pmax 1200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.4Ω
• Inductance (1kHz) LE 0.879mH
• VC Diameter 88mm
• Winding height HVC 19mm
• Winding material Aluminium
• Former material Kapton

Magnet

• Flux density B 1.05T
• Force factor Bl 18.5N/A
• Motor constant Bl/√RE 7.98N/√W
• Air gap height HAG 11mm
• Material Neodymium

Diaphragm

• Effective diameter 325mm
• Effective area SD 830cm²
• Moving mass MMS 90.5g
• Moving mass (without air load) MMD 73.6g
• Material Paper with glassfiber

Suspensions

• Stiffness KMS 5.41N/mm
• Compliance CMS 185µm/N
• Equivalent volume to the compliance VAS 177L
• Mechanical resistance RMS 2.49N·s/m

Dimensions

• Nominal diameter 15″
• 388mm
• Overall diameter 388mm
• Baffle cutout diameter 355mm
• Overall depth 175mm
• Volume occupied by the driver (estimated) 3.2L
• Net weight 5.32kg
• Frame material Die Cast Aluminium