Radian 5215B

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.1dB
• Frequency response 40 - 18000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 40Hz
• Mechanical quality factor QMS 3.28
• Electrical quality factor QES 0.29
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 5.5mm
• Air volume displaced at xmax VD 484cm³
• Power handling P 625W
• Program power Pmax 1250W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.3Ω
• Inductance (1kHz) LE 1.3mH
• VC Diameter 101.6mm
• Winding height HVC 16.5mm
• Winding material Copper Clad aluminum
• Former material Fiberglass

Magnet

• Force factor Bl 20N/A
• Motor constant Bl/√RE 8.69N/√W
• Air gap height HAG 10mm
• Material Ferrite

Diaphragm

• Effective diameter 335mm
• Effective area SD 880cm²
• Moving mass MMS 88g
• Moving mass (without air load) MMD 70g
• Material Paper/Kevlar composite

Suspensions

• Stiffness KMS 5.44N/mm
• Compliance CMS 184µm/N
• Equivalent volume to the compliance VAS 202L
• Mechanical resistance RMS 6.74N·s/m

Dimensions

• Nominal diameter 15″
• 380mm
• Overall diameter 388mm
• Baffle cutout diameter 356mm
• Overall depth 209mm
• Flange thickness 16mm
• Mounting depth 193mm
• Volume occupied by the driver (estimated) 6.7L
• Net weight 14.0kg
• Frame material Cast Aluminum