FiiO K17 R2R Black Hi-Fi DAC & ADC Interface

FiiO K17 R2R — Desktop DAC, Headphone Amplifier & Streamer

The FiiO K17 R2R is a desktop DAC, headphone amplifier, and network streamer built around FiiO's in-house 24+5-bit segmented R2R PRO resistor array. This model swaps the delta-sigma stage of the original K17 for a discrete resistor-ladder design with 316 precision resistors and a more powerful FPGA, delivering a 12 dB improvement in dynamic range over FiiO's earlier R2R units. An aluminium chassis with real black walnut wood side panels houses a fully balanced signal path, a discrete Class AB headphone amplifier, and a 3.93-inch LCD display. For listeners who want R2R tonality without stacking separate boxes, this unit combines decoding, amplification, and streaming in one chassis.

Proprietary R2R PRO Array & Real-Wood Craftsmanship

What sets this unit apart is the segmented R2R PRO resistor array, where the upper 5 bits are decoded through 31 thermometer-coded resistors to minimise the cumulative error that plagues traditional R2R ladders. The discrete Class AB headphone amplifier uses ON Semiconductor MJE243/253 transistors in an OP+ current-amplification topology, while solid black walnut side panels soften the digital display and rotary controls. Three ACCUSILICON femtosecond clocks, a custom low-noise linear transformer, and physically separated digital, analogue, and power boards complete the build.

Technical Specifications

The decoding chain, amplification stage, and streaming module are specified for desktop headphone and preamp use across a wide range of loads.

• DAC Architecture: Proprietary 24+5-bit segmented R2R PRO resistor array, 316 resistors, 0.1% tolerance
• USB Decoding: XMOS XU316, up to 768 kHz / 32-bit PCM, DSD256 native, full MQA
• Headphone Output Power: 4,000 mW + 4,000 mW balanced (32 Ω), 1,850 mW + 1,850 mW single-ended (32 Ω)
• Headphone Outputs: 6.35 mm SE, 4.4 mm balanced, 4-pin XLR balanced
• Streaming & DSP: Roon Ready, AirPlay, QPlay, NAS (SMB/NFS), Bluetooth 5.1 with LDAC, 31-band PEQ with AUTO EQ
• Dimensions / Weight: 245 × 223 × 69 mm / 2.9 kg

Who Is It For

The K17 R2R is the right choice for desktop listeners who want R2R tonality, serious headphone-driving power, and full streaming in a single box. It handles everything from ultra-sensitive IEMs to planar magnetics like the Audeze LCD-1 and HiFiMAN Sundara, where super-high and ultra-high gain stages deliver proper voltage swing. Roon users get a tightly integrated endpoint with IC-based analogue volume control, while Tidal and Qobuz subscribers stream via the M Connect app over UPnP. For two-channel speaker systems, the XLR and RCA line outputs plus a preamp mode make it a flexible hub for a power amplifier or active monitors.