Fostex FE108SS-HP

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.7dB
• Frequency response 81 - 28000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 81Hz
• Mechanical quality factor QMS 4.13
• Electrical quality factor QES 0.43
• Total quality factor QTS 0.39

Large signal parameters

• Power handling P 15W
• Program power Pmax 30W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 7.3Ω
• Inductance (1kHz) LE 0.07mH
• VC Diameter 20mm

Magnet

• Force factor Bl 5.27N/A
• Motor constant Bl/√RE 1.95N/√W

Diaphragm

• Effective diameter 80mm
• Effective area SD 50.1cm²
• Moving mass MMS 3.2g
• Moving mass (without air load) MMD 2.9g

Suspensions

• Stiffness KMS 0.826N/mm
• Compliance CMS 1210µm/N
• Equivalent volume to the compliance VAS 4.31L
• Mechanical resistance RMS 0.39N·s/m

Dimensions

• Nominal diameter 4″
• 100mm
• Overall diameter 128mm
• Baffle cutout diameter 102mm
• Volume occupied by the driver (estimated) 0.75L
• Net weight 1.83kg