Play anything from anywhere, Qplay Casting + NAS Playback

With Roon Ready, AirPlay, and Qplay certifications, the K17 R2R works seamlessly with the platforms and devices you already use. Newly added NAS server playback brings your home music library into the picture, supporting NFS and SMB protocols with one-tap access via the FIIO Control app. From cloud streaming to lossless local network playback—whatever you want to hear, the K17 R2R gets it to your ears.

Precisely restored audio, Every last detail audible

3 low phase noise femtosecond audio crystal oscillators

The K17 R2R employs two industry-leading ACCUSILICON AS318-L ultra-low phase noise femtosecond crystal oscillators (45.1584MHz, 49.1520MHz) alongside a FIIO-customized ultra-low phase noise femtosecond oscillator (12MHz). These significantly reduce the impact of phase noise on audio signals, allowing audio signals of various sampling rates to be precisely and faithfully restored—resulting in purer and more consistent sound.

Listen with peace of mind with various protection mechanisms that can intelligently detect abnormal conditions and perform automatic protection to avoid damage to the machine, including: headphone amp temperature protection, transformer temperature protection, output overload protection, output DC protection, and power input overcurrent protection.

Multiple protection systems, Listen without worries

Eight operating modes

Many usage scenarios

Building on the classic square-and-round design, the side panels have been reimagined. Choose the silver chassis with imported ash wood for a look that's crisp and quietly elegant; opt for the black chassis with imported black walnut for a deeper, more reserved sophistication. The organic grain of solid wood and the precision of metal finish each other in perfect contrast—and because no two pieces of wood are alike, every unit is entirely its own. Multiple knobs provide smooth, intuitive control, while the grille structure ensures efficient heat dissipation. Every last detail has been thoughtfully engineered.

*The side panels are crafted from select natural wood imported from North America. Because every wood grain pattern is uniquely formed by nature, the appearance of the actual product may vary.

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Square and circle, The warmth of real wood

The K17 R2R features a M21586Q DSP chip which is capable of double-precision 64-bit floating-point calculations, and runs at a high 360MHz clock frequency. This chip is complemented by a high-performance ES9821Q ADC as well as a specially customized ultra-low phase noise femtosecond crystal oscillator. These three components allow the user, in all modes, to utilize the 31-band high-precision lossless PEQ. The PEQ is designed to ensure the audio signal is still of high fidelity even after being processed. The chip also allows for robust output protection functionality, ensuring that headphones and other connected audio equipment are fully protected.

Specialty chips for specialty uses, Exceptionally strong

An important part of the K17 R2R is a carefully crafted fully discrete amplifier circuit for headphones. This discrete circuit is of an OP+ transistor current amplification design, equipped with the classic pair of ON Semiconductor MJE243/253 transistors. It is capable of producing high current with low output impedance. The result is up to 4000mW+4000mW output power in balanced mode, nearly double that of the K9 Pro ESS. This allows it to easily drive various kinds of headphones and IEMs and to produce smooth, pleasant, and natural sound.

Discrete class AB current amplification headphone amplifier

DEL (Dual Engine Limiter) technology together with proprietary algorithms allows the K17 R2R’s PEQ to be capable of dynamic range compression (DRC)/dynamic range expansion (DRE), limiter, and compressor adjustment functions. PCM 44.1k~96k signals can be processed in the PEQ without sample rate conversion. Fine adjustments of audio parameters are thus possible, allowing for adjustment such as a gain range of +12~-24dB and a Q value range of 0.4dB~128dB. The PEQ allows the user to simulate or correct the frequency response curve. PEQ settings can be easily exported, imported, shared, and saved—making it easy for anybody to use the PEQ and correct or simulate various frequency response curves of different headphones.

31-band high-precision lossless PEQ

Find manually adjusting a 31-band lossless PEQ too complex? AUTO EQ automatically matches your headphones’ target curve, instantly unlocking your ideal listening profile with a single click while keeping the audio pristine and lossless. It also comes packed with built-in presets for Pop, Jazz, and Classical, plus the freedom to customize and fine-tune band by band—giving you complete personal control over your ideal sound.

Supports AUTO EQ Your ideal sound, One tap away

High-end parts, All for great sound

High-end parts, All for great sound

Multiple control methods, Easy to use

The Ethernet port supports up to Gigabit speeds for fast and stable data transmission. The AP6256 Wi-Fi module supports 2.4G and 5G wireless networks as an alternative yet equally stable method of transmitting lossless audio.

Wired or wireless, Always online

Buttons and ports labeled

From the DAC, to the I/V conversion, to the low-pass filtering, and to headphone amp, the entire audio circuit is of a fully differential circuit architecture design. This ensures both high dynamic range of the signals as well as significantly reduced crosstalk. Various parts of the audio circuit, including the I/V conversion and LPF stages, use multiple low-noise precision Texas Instruments (TI) op-amps to ensure dynamic audio output.

Fully balanced design

Precision power supply design

35W low-noise linear power supply, Five large 4700μF electrolytic capacitors

Separate power supplies for analog and digital circuits

Multi-stage analog power supply