Beyma 3FR30

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.3dB
• Frequency response 160 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 160Hz
• Mechanical quality factor QMS 8.00
• Electrical quality factor QES 0.52
• Total quality factor QTS 0.49

Large signal parameters

• Maximum linear excursion xmax 4.5mm
• Air volume displaced at xmax VD 14cm³
• Power handling P 30W
• Program power Pmax 60W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.6Ω
• Inductance (1kHz) LE 0.25mH
• VC Diameter 20.3mm
• Winding height HVC 10.5mm

Magnet

• Force factor Bl 4.9N/A
• Motor constant Bl/√RE 2.07N/√W
• Air gap height HAG 3mm
• Material Ferrite

Diaphragm

• Effective diameter 62mm
• Effective area SD 30cm²
• Moving mass MMS 2.2g
• Moving mass (without air load) MMD 2.1g

Suspensions

• Stiffness KMS 2.33N/mm
• Compliance CMS 430µm/N
• Equivalent volume to the compliance VAS 0.67L
• Mechanical resistance RMS 0.28N·s/m

Dimensions

• Nominal diameter 3″
• 77mm
• Volume occupied by the driver (estimated) 0.22L
• Net weight 0.57kg