Each earpiece gathers one dynamic driver, four balanced armatures and eight electrostatics. The eight Sonion electrostatics take everything above 6 kHz and reach up to 50 kHz. A five-way crossover, electronic and acoustic, splits the signal. The dynamic driver's diaphragm is a lithium-magnesium alloy with a density of 1.6 grams per cubic centimetre.
The shell is milled from a block of pure titanium, then hand-polished. The acoustic duct follows the S.Turbo path patented by FiiO. Damping vents of 0.2 millimetres work the rear cavity.
The earpiece connects over MMCX and the cable takes three terminations: 3.5 mm, 4.4 mm balanced and USB-C. The last has a decoding chip up to 384 kHz at 32-bit and an eight-band equaliser. The cable mixes gold, silver and copper strands.
The package holds twenty-two pairs of tips, among them the HS18, SpinFit and HS20. The FX17 is Hi-Res Audio certified by JAS and CEA.
Data sheet
Specific References
The FiiO JM21 is an ultra-slim Android audiophile digital audio player (DAP) featuring dual CS43198 DACs, 700 mW of power, and Wi-Fi.
MMCX earphone cable with 360 wires of gold, silver and copper, about 1.2 m long. Its 3.5 mm, 2.5 mm and 4.4 mm plugs are interchangeable.
FiiO LS-3.5B cable for earphones with 0.78 mm 2-pin connectors, with a microphone and in-line control button. Its 3.5 mm jack plug is L-shaped.
Balanced earphone cable in silver-plated copper, with a 4.4 mm plug and 0.78 mm 2-pin connectors. It has 280 strands and was designed for the FiiO FD11 and FH11 earphones.
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