Fountek FE85

• Sensitivity (1W, 1m, infinite baffle)SPL1W85dB
• Frequency response100 - 25000Hz

Thiele & Small parameters

• Resonance frequency (free air)fS125Hz
• Mechanical quality factorQMS2.13
• Electrical quality factorQES0.67
• Total quality factorQTS0.52

Large signal parameters

• Maximum linear excursionxmax1.5mm
• Air volume displaced at xmaxVD4.1cm³
• Power handlingP12W
• Program powerPmax24W

Voice Coil

• Nominal impedanceZ8Ω
• DC resistanceRE6.0Ω
• Inductance (1kHz, estimated)LE0.13mH
• VC Diameter20mm
• Winding heightHVC7mm
• Winding materialCopper
• Former materialBlack Aluminum

Magnet

• Flux densityB1T
• Force factorBl3.7N/A
• Motor constantBl/√RE1.51N/√W
• Air gap heightHAG3mm
• MaterialFerrite

Diaphragm

• Effective diameter59mm
• Effective areaSD27cm²
• Moving massMMS2.07g
• Moving mass (without air load)MMD2g

Suspensions

• StiffnessKMS1.22N/mm
• ComplianceCMS820µm/N
• Equivalent volume to the complianceVAS0.85L
• Mechanical resistanceRMS0.76N·s/m

Dimensions

• Nominal diameter3.5″
• 85mm
• Overall diameter90mm
• Overall depth43mm
• Volume occupied by the driver (estimated)0.11L
• Net weight0.47kg