P.Audio 12BM-500B

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.9dB
• Frequency response 50 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 52Hz
• Mechanical quality factor QMS 5.94
• Electrical quality factor QES 0.37
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 4.8mm
• Air volume displaced at xmax VD 265cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.6Ω
• Inductance (1kHz) LE 0.63mH
• VC Diameter 82.5mm
• Winding height HVC 19.6mm
• Winding material CCA-W
• Former material Glass fiber

Magnet

• Flux density B 1.1T
• Force factor Bl 16.6N/A
• Motor constant Bl/√RE 7.01N/√W
• Air gap height HAG 10mm
• Material Ferrite

Diaphragm

• Effective diameter 264mm
• Effective area SD 552cm²
• Moving mass MMS 56.1g
• Moving mass (without air load) MMD 47g
• Material Paper

Suspensions

• Stiffness KMS 6.17N/mm
• Compliance CMS 162µm/N
• Equivalent volume to the compliance VAS 69.8L
• Mechanical resistance RMS 3.09N·s/m
• Surround material Cloth
• Spider material Cotton (Single)

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 314mm
• Baffle cutout diameter 283mm
• Overall depth 148mm
• Flange thickness 18mm
• Mounting depth 130mm
• Volume occupied by the driver (estimated) 3.6L
• Net weight 9.2kg
• Frame material Aluminium