Radian 5212B

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.6dB
• Frequency response 50 - 30000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 62Hz
• Mechanical quality factor QMS 9.20
• Electrical quality factor QES 0.44
• Total quality factor QTS 0.42

Large signal parameters

• Maximum linear excursion xmax 5.6mm
• Air volume displaced at xmax VD 280cm³
• Power handling P 375W
• Program power Pmax 750W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.0Ω
• Inductance (1kHz) LE 1.4mH
• VC Diameter 76.2mm
• Winding height HVC 16mm
• Winding material Copper Clad Aluminum
• Former material Fiberglass

Magnet

• Force factor Bl 15.5N/A
• Motor constant Bl/√RE 6.33N/√W
• Air gap height HAG 9.5mm
• Material Ferrite

Diaphragm

• Effective diameter 252mm
• Effective area SD 500cm²
• Moving mass MMS 45.5g
• Moving mass (without air load) MMD 37.3g
• Material Paper/Kevlar composite

Suspensions

• Stiffness KMS 6.67N/mm
• Compliance CMS 150µm/N
• Equivalent volume to the compliance VAS 58.4L
• Mechanical resistance RMS 1.93N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 314mm
• Baffle cutout diameter 283mm
• Overall depth 175mm
• Flange thickness 15mm
• Mounting depth 160mm
• Volume occupied by the driver (estimated) 3.2L
• Net weight 6.6kg
• Frame material Cast Aluminum