Fostex FE166En

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.7dB
• Frequency response 53 - 22000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 53Hz
• Mechanical quality factor QMS 3.43
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 1mm
• Air volume displaced at xmax VD 13cm³
• Power handling P 22W
• Program power Pmax 65W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 7.2Ω
• Inductance (1kHz) LE 0.052mH
• VC Diameter 25mm

Magnet

• Force factor Bl 7.65N/A
• Motor constant Bl/√RE 2.85N/√W
• Weight 0.6kg
• Material Ferrite

Diaphragm

• Effective diameter 130mm
• Effective area SD 133cm²
• Moving mass MMS 6.8g
• Moving mass (without air load) MMD 5.7g

Suspensions

• Stiffness KMS 0.678N/mm
• Compliance CMS 1474µm/N
• Equivalent volume to the compliance VAS 37L
• Mechanical resistance RMS 0.66N·s/m

Dimensions

• Nominal diameter 6.5″
• 160mm
• Overall diameter 166mm
• Baffle cutout diameter 146mm
• Overall depth 75mm
• Volume occupied by the driver (estimated) 0.5L
• Net weight 1.6kg