Beyma SM-212

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.5dB
• Frequency response 45 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 43Hz
• Mechanical quality factor QMS 5.30
• Electrical quality factor QES 0.40
• Total quality factor QTS 0.38

Large signal parameters

• Maximum linear excursion xmax 8.3mm
• Maximum excursion before damage xlim 13.5mm
• Air volume displaced at xmax VD 454cm³
• Power handling P 350W
• Program power Pmax 700W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 0.6mH
• VC Diameter 63.5mm
• Winding height HVC 19.5mm

Magnet

• Force factor Bl 14.4N/A
• Motor constant Bl/√RE 6.14N/√W
• Air gap height HAG 7mm
• Material Ferrite

Diaphragm

• Effective diameter 265mm
• Effective area SD 550cm²
• Moving mass MMS 57g
• Moving mass (without air load) MMD 48.3g

Suspensions

• Stiffness KMS 4.17N/mm
• Compliance CMS 240µm/N
• Equivalent volume to the compliance VAS 103L
• Mechanical resistance RMS 2.9N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Volume occupied by the driver (estimated) 2L
• Net weight 4.6kg