Beyma 12G40

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.9dB
• Frequency response 45 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 44Hz
• Mechanical quality factor QMS 11.60
• Electrical quality factor QES 0.30
• Total quality factor QTS 0.29

Large signal parameters

• Maximum linear excursion xmax 7mm
• Maximum excursion before damage xlim 28mm
• Air volume displaced at xmax VD 371cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.0Ω
• Inductance (1kHz) LE 2.1mH
• VC Diameter 76.2mm
• Winding height HVC 17.5mm

Magnet

• Force factor Bl 18.4N/A
• Motor constant Bl/√RE 7.51N/√W
• Air gap height HAG 8mm

Diaphragm

• Effective diameter 260mm
• Effective area SD 530cm²
• Moving mass MMS 62g
• Moving mass (without air load) MMD 53.3g

Suspensions

• Stiffness KMS 4.85N/mm
• Compliance CMS 206µm/N
• Equivalent volume to the compliance VAS 81L
• Mechanical resistance RMS 1.5N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 312mm
• Baffle cutout diameter 278mm
• Overall depth 133mm
• Volume occupied by the driver (estimated) 2.8L
• Net weight 7.1kg