Fountek FE85

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85dB
• Frequency response 100 - 25000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 125Hz
• Mechanical quality factor QMS 2.13
• Electrical quality factor QES 0.67
• Total quality factor QTS 0.52

Large signal parameters

• Maximum linear excursion xmax 1.5mm
• Air volume displaced at xmax VD 4.1cm³
• Power handling P 12W
• Program power Pmax 24W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.0Ω
• Inductance (1kHz, estimated) LE 0.22mH
• VC Diameter 20mm
• Winding height HVC 7mm
• Winding material Copper
• Former material Black Aluminum

Magnet

• Flux density B 1T
• Force factor Bl 3.7N/A
• Motor constant Bl/√RE 1.51N/√W
• Air gap height HAG 3mm
• Material Ferrite

Diaphragm

• Effective diameter 59mm
• Effective area SD 27cm²
• Moving mass MMS 2.07g
• Moving mass (without air load) MMD 2g

Suspensions

• Stiffness KMS 1.22N/mm
• Compliance CMS 820µm/N
• Equivalent volume to the compliance VAS 0.85L
• Mechanical resistance RMS 0.76N·s/m

Dimensions

• Nominal diameter 3.5″
• 85mm
• Overall diameter 90mm
• Overall depth 43mm
• Volume occupied by the driver (estimated) 0.11L
• Net weight 0.47kg