The K15 accepts USB, coaxial, optical, a single-ended line input, a balanced input, Bluetooth, network streaming and local playback from a USB stick. A 3.93-inch touchscreen at 240 x 1020 pixels acts as the dashboard. The chassis measures 244.6 x 213 x 66.8 mm and weighs 2100 g.
Conversion falls to two AK4497S, backed by an X2000 controller, an ESP32-S3 and an XU316 USB stage. Amplification leaves the op-amp alone behind in favour of discrete MJE243G and MJE253G transistors in class AB. Two Accusilicon AS318-L oscillators clock the whole unit.
Balanced and at ultra gain, the output delivers 3000 mW per channel into 32 ohms and 700 mW into 300 ohms. The single-ended output reaches 1400 mW into 16 and 32 ohms. Five gain levels and accepted impedances of 8 to 350 ohms suit an in-ear as readily as a demanding headphone.
Gigabit Ethernet and dual-band Wi-Fi feed the streaming mode, while Bluetooth 5.1 receives over SBC, AAC, aptX, aptX LL, aptX HD, aptX Adaptive and LDAC. The USB input rises to 768 kHz at 32-bit and native DSD512, with full MQA decoding. A ten-band parametric equaliser and an infrared remote round out the unit.
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.
The FiiO FT5 in black are open-back over-ear headphones with a 90 mm planar magnetic driver, supplied with four interchangeable audio plugs.
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