Oberton 18B450

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.6dB
• Frequency response 35 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 34.4Hz
• Mechanical quality factor QMS 8.03
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 7.3mm
• Air volume displaced at xmax VD 805cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.3Ω
• Inductance (1kHz) LE 1.49mH
• VC Diameter 77mm
• Winding height HVC 20mm
• Winding material Copper
• Former material Glass fiber

Magnet

• Flux density B 1.2T
• Force factor Bl 22.1N/A
• Motor constant Bl/√RE 9.62N/√W
• Air gap height HAG 11mm
• Material Ferrite

Diaphragm

• Effective diameter 376mm
• Effective area SD 1110cm²
• Moving mass MMS 153g
• Moving mass (without air load) MMD 126g
• Material Paper

Suspensions

• Stiffness KMS 7.14N/mm
• Compliance CMS 140µm/N
• Equivalent volume to the compliance VAS 242L
• Mechanical resistance RMS 4.11N·s/m

Dimensions

• Nominal diameter 18″
• 461mm
• Overall diameter 461mm
• Baffle cutout diameter 417mm
• Overall depth 193mm
• Volume occupied by the driver (estimated) 5.2L
• Net weight 8.55kg
• Frame material Die cast aluminium