Conversion rests on two AKM AK4493S, one per channel, with an XMOS XUF208 USB stage ahead of them. Volume runs through two NJU72315 driven by a sampled potentiometer. Two gain levels cover impedances from 16 to 300 ohms.
Two THX AAA 788+ modules carry the output stage. The 4.4 mm balanced socket delivers 2000 milliwatts per channel into 32 ohms and 560 milliwatts into 300 ohms. The 6.35 mm single-ended socket stays at 1220 and 140 milliwatts into the same loads.
Signal-to-noise reaches 128 dB on the analogue input and 120 dB over USB, for distortion of 0.0003 % into 32 ohms. Crosstalk exceeds 124 dB balanced. The RCA line output delivers at least 2 volts RMS.
The USB-B input rises to 384 kHz at 32-bit and DSD256; the coaxial input caps at 192 kHz/24-bit and the optical at 96 kHz. An RCA line input completes the set. An indicator changes colour with the incoming sampling rate, and the unit weighs 610 grams.
Data sheet
Specific References
The FiiO FT13 is a closed-back over-ear headphone with amaranth wood ear cups, a 60 mm dynamic driver, and a W-shaped diaphragm, and is Hi-Res Audio certified.
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.
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