Fostex FE168EΣ

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.4dB
• Frequency response 51 - 21000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 51Hz
• Mechanical quality factor QMS 5.33
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 1.6mm
• Air volume displaced at xmax VD 18cm³
• Power handling P 27W
• Program power Pmax 80W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.8Ω
• Inductance (1kHz) LE 0.056mH
• VC Diameter 30mm

Magnet

• Force factor Bl 8N/A
• Motor constant Bl/√RE 3.07N/√W
• Weight 0.721kg
• Material Ferrite

Diaphragm

• Effective diameter 120mm
• Effective area SD 113cm²
• Moving mass MMS 8.7g
• Moving mass (without air load) MMD 7.7g

Suspensions

• Stiffness KMS 0.782N/mm
• Compliance CMS 1278µm/N
• Equivalent volume to the compliance VAS 23.7L
• Mechanical resistance RMS 0.52N·s/m

Dimensions

• Nominal diameter 6.5″
• 160mm
• Overall diameter 190mm
• Baffle cutout diameter 155mm
• Overall depth 88mm
• Volume occupied by the driver (estimated) 0.83L
• Net weight 2.6kg