Beyma 6MI90

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.8dB
• Frequency response 140 - 8000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 134Hz
• Mechanical quality factor QMS 8.40
• Electrical quality factor QES 0.44
• Total quality factor QTS 0.42

Large signal parameters

• Maximum linear excursion xmax 2.5mm
• Air volume displaced at xmax VD 35cm³
• Power handling P 125W
• Program power Pmax 250W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.7Ω
• Inductance (1kHz) LE 0.4mH
• VC Diameter 38.1mm
• Winding height HVC 7.5mm

Magnet

• Force factor Bl 11.3N/A
• Motor constant Bl/√RE 4.73N/√W
• Air gap height HAG 6mm
• Material Ferrite

Diaphragm

• Effective diameter 134mm
• Effective area SD 140cm²
• Moving mass MMS 11g
• Moving mass (without air load) MMD 9.8g

Suspensions

• Stiffness KMS 8.26N/mm
• Compliance CMS 121µm/N
• Equivalent volume to the compliance VAS 3.35L
• Mechanical resistance RMS 1.16N·s/m

Dimensions

• Nominal diameter 6.5″
• 165mm
• Volume occupied by the driver (estimated) 0.91L
• Net weight 2.2kg