Beyma SM-108

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

Thiele & Small parameters

• Resonance frequency (free air) fS 71Hz
• Mechanical quality factor QMS 3.80
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 6mm
• Maximum excursion before damage xlim 11mm
• Air volume displaced at xmax VD 132cm³
• Power handling P 150W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.2Ω
• Inductance (1kHz) LE 0.9mH
• VC Diameter 51.7mm
• Winding height HVC 15mm

Magnet

• Force factor Bl 14N/A
• Motor constant Bl/√RE 5.62N/√W
• Air gap height HAG 7mm
• Material Ferrite

Diaphragm

• Effective diameter 167mm
• Effective area SD 220cm²
• Moving mass MMS 24g
• Moving mass (without air load) MMD 21.7g

Suspensions

• Stiffness KMS 4.76N/mm
• Compliance CMS 210µm/N
• Equivalent volume to the compliance VAS 14.4L
• Mechanical resistance RMS 2.8N·s/m

Dimensions

• Nominal diameter 8″
• 200mm
• Overall depth 94mm
• Volume occupied by the driver (estimated) 0.84L
• Net weight 3.1kg