Oberton 18FBR700

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.9dB
• Frequency response 40 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35.6Hz
• Mechanical quality factor QMS 12.63
• Electrical quality factor QES 0.28
• Total quality factor QTS 0.27

Large signal parameters

• Maximum linear excursion xmax 8mm
• Air volume displaced at xmax VD 888cm³
• Power handling P 700W
• Program power Pmax 1400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.3Ω
• Inductance (1kHz) LE 1.5mH
• VC Diameter 100mm
• Winding height HVC 23mm
• Winding material Aluminium
• Former material Glass fiber

Magnet

• Flux density B 1.03T
• Force factor Bl 25.2N/A
• Motor constant Bl/√RE 11N/√W
• Air gap height HAG 14mm
• Material Ferrite

Diaphragm

• Effective diameter 376mm
• Effective area SD 1110cm²
• Moving mass MMS 149g
• Moving mass (without air load) MMD 122g
• Material Paper with carbone fibers

Suspensions

• Stiffness KMS 7.46N/mm
• Compliance CMS 134µm/N
• Equivalent volume to the compliance VAS 231L
• Mechanical resistance RMS 2.64N·s/m

Dimensions

• Nominal diameter 18″
• 461mm
• Overall diameter 461mm
• Baffle cutout diameter 417mm
• Overall depth 205mm
• Volume occupied by the driver (estimated) 7L
• Net weight 12.9kg
• Frame material Die cast aluminium