Fostex FE88-Sol

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.1dB
• Frequency response 100 - 30000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 100Hz
• Mechanical quality factor QMS 3.91
• Electrical quality factor QES 0.51
• Total quality factor QTS 0.45

Large signal parameters

• Maximum linear excursion xmax 1.1mm
• Air volume displaced at xmax VD 4.1cm³
• Power handling P 10W
• Program power Pmax 15W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 7.0Ω
• Inductance (1kHz) LE 0.06mH
• VC Diameter 16.4mm

Magnet

• Force factor Bl 4.47N/A
• Motor constant Bl/√RE 1.69N/√W
• Weight 0.584kg

Diaphragm

• Effective diameter 69mm
• Effective area SD 37cm²
• Moving mass MMS 2.2g
• Moving mass (without air load) MMD 2g

Suspensions

• Stiffness KMS 0.962N/mm
• Compliance CMS 1040µm/N
• Equivalent volume to the compliance VAS 2L
• Mechanical resistance RMS 0.35N·s/m

Dimensions

• Nominal diameter 3.4″
• 85mm
• Overall diameter 112mm
• Baffle cutout diameter 90mm
• Overall depth 57mm
• Volume occupied by the driver (estimated) 0.26L
• Net weight 1.145kg