Oberton 12H4CX72

• Sensitivity (1W, 1m, infinite baffle) SPL1W 98.1dB
• Frequency response 60 - 18000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 49.9Hz
• Mechanical quality factor QMS 10.33
• Electrical quality factor QES 0.26
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 4.5mm
• Air volume displaced at xmax VD 232cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.5Ω
• Inductance (1kHz) LE 0.445mH
• VC Diameter 100mm
• Winding height HVC 6mm
• Winding material Copper Clad Aluminium
• Former material Glass fiber

Magnet

• Flux density B 1.37T
• Force factor Bl 19.9N/A
• Motor constant Bl/√RE 7.81N/√W
• Air gap height HAG 12mm
• Material Neodymium

Diaphragm

• Effective diameter 256mm
• Effective area SD 515cm²
• Moving mass MMS 50.4g
• Moving mass (without air load) MMD 41.9g
• Material Paper with Kevlar fibers

Suspensions

• Stiffness KMS 4.95N/mm
• Compliance CMS 202µm/N
• Equivalent volume to the compliance VAS 74.7L
• Mechanical resistance RMS 1.53N·s/m

Dimensions

• Nominal diameter 12″
• 315mm
• Overall diameter 315mm
• Baffle cutout diameter 280mm
• Overall depth 242mm
• Volume occupied by the driver (estimated) 5.2L
• Net weight 10.1kg
• Frame material Die Cast Aluminium