P.Audio 12BM-300B v3

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.5dB
• Frequency response 45 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 55Hz
• Mechanical quality factor QMS 5.95
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 3.9mm
• Air volume displaced at xmax VD 215cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 0.5mH
• VC Diameter 76.2mm
• Winding height HVC 16.8mm
• Winding material CCA-W
• Former material Glass fiber

Magnet

• Flux density B 1.2T
• Force factor Bl 17.1N/A
• Motor constant Bl/√RE 7.27N/√W
• Air gap height HAG 9mm
• Material Ferrite

Diaphragm

• Effective diameter 264mm
• Effective area SD 552cm²
• Moving mass MMS 56.7g
• Moving mass (without air load) MMD 47.6g
• Material Paper

Suspensions

• Stiffness KMS 6.9N/mm
• Compliance CMS 145µm/N
• Equivalent volume to the compliance VAS 62.4L
• Mechanical resistance RMS 3.29N·s/m
• Surround material Cloth
• Spider material Cotton (Single)

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 314mm
• Baffle cutout diameter 283mm
• Overall depth 151mm
• Flange thickness 16mm
• Mounting depth 135mm
• Volume occupied by the driver (estimated) 3.2L
• Net weight 7.4kg
• Frame material Aluminium