Oberton 15NB500

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.9dB
• Frequency response 42 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 42.8Hz
• Mechanical quality factor QMS 11.97
• Electrical quality factor QES 0.26
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 7.3mm
• Air volume displaced at xmax VD 602cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.14mH
• VC Diameter 77mm
• Winding height HVC 20mm
• Winding material Copper
• Former material Glass fiber

Magnet

• Flux density B 1.2T
• Force factor Bl 24.3N/A
• Motor constant Bl/√RE 10.6N/√W
• Air gap height HAG 11mm
• Material Neodymium

Diaphragm

• Effective diameter 325mm
• Effective area SD 830cm²
• Moving mass MMS 110g
• Moving mass (without air load) MMD 92.7g
• Material Paper with Glass fiber

Suspensions

• Stiffness KMS 7.94N/mm
• Compliance CMS 126µm/N
• Equivalent volume to the compliance VAS 121L
• Mechanical resistance RMS 2.46N·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