Beyma 8G40

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.2dB
• Frequency response 70 - 6000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 70Hz
• Mechanical quality factor QMS 6.80
• Electrical quality factor QES 0.38
• Total quality factor QTS 0.36

Large signal parameters

• Maximum linear excursion xmax 6.5mm
• Maximum excursion before damage xlim 23mm
• Air volume displaced at xmax VD 143cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.1Ω
• Inductance (1kHz) LE 1.3mH
• VC Diameter 63.5mm
• Winding height HVC 16mm

Magnet

• Force factor Bl 12.2N/A
• Motor constant Bl/√RE 4.94N/√W
• Air gap height HAG 7mm

Diaphragm

• Effective diameter 167mm
• Effective area SD 220cm²
• Moving mass MMS 21g
• Moving mass (without air load) MMD 18.6g

Suspensions

• Stiffness KMS 4.07N/mm
• Compliance CMS 246µm/N
• Equivalent volume to the compliance VAS 17L
• Mechanical resistance RMS 1.4N·s/m

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 212mm
• Baffle cutout diameter 181mm
• Overall depth 96mm
• Volume occupied by the driver (estimated) 1.1L
• Net weight 3.3kg