FiiO K17 R2R Silver Hi-Fi DAC & ADC Interface

FiiO K17 R2R — All-in-One Desktop DAC and Headphone Amplifier

The FiiO K17 R2R is a desktop audio hub combining a proprietary R2R DAC, network streamer, preamplifier, and headphone amplifier in one chassis. At its core sits FiiO's 24+5-bit segmented R2R PRO resistor array, where the upper five bits use thermometer-coded decoding to reduce cumulative ladder errors. Fully-balanced circuitry, discrete Class AB amplification, and genuine North American hardwood side panels round out the design.

What Sets the K17 R2R Apart

The K17 R2R is the first FiiO product to deploy the R2R PRO architecture, using 316 precision resistors and a more powerful FPGA than the entry-level R2R designs found in the K13 R2R and FiiO WARMER DAC. The discrete Class AB headphone stage uses ON Semiconductor MJE243 and MJE253 output transistors in an OP+ transistor current amplification topology for high current with low output impedance.

Technical Parameters — DAC, Amplifier, and Streaming

The R2R PRO DAC pairs with an XMOS XU316 USB interface supporting up to 768 kHz/32-bit PCM and DSD256 Native, while a Qualcomm QCC5125 Bluetooth 5.1 chipset handles LDAC, aptX Adaptive, aptX HD, and more. Streaming covers Roon Ready, AirPlay, QPlay, and NAS playback over SMB or NFS.

• DAC Architecture: Proprietary 24+5-bit segmented R2R PRO resistor array — thermometer-coded decoding for the upper 5 bits
• Headphone Output Power (32Ω Balanced): 4,000 mW + 4,000 mW — drives demanding planar magnetics with control
• USB Decoding: Up to 768 kHz/32-bit PCM, DSD256 Native via XMOS XU316
• Bluetooth: Version 5.1 with LDAC, aptX Adaptive, aptX HD, aptX, aptX LL, SBC
• SNR / THD+N: ≥125 dB (A-weighted) / <0.0052% (1 kHz, -8 dB, 32Ω)

Who the K17 R2R Is Built For

The K17 R2R is the right choice for desktop audiophiles who want a single-box solution for headphones, powered speakers, and streaming without stacking separate components. It suits listeners who appreciate R2R warmth but want more resolution and transient speed than entry-level R2R designs deliver. Headphone users with demanding planar magnetics will find the 4,000 mW balanced output and discrete Class AB stage provide confident control, while sensitive IEM users benefit from the ultra-low noise floor at lower gain settings. Roon subscribers and NAS library owners will appreciate the integrated streaming platform, and the 31-band PEQ with AUTO EQ makes tuning any headphone to a preferred target curve straightforward.

FiiO's R2R Desktop Line

FiiO has been steadily building a desktop R2R lineup, starting with the K11 R2R and K13 R2R before arriving at the K17 R2R. The R2R PRO architecture uses more resistors and a more capable FPGA than those entry-level designs, delivering a 12 dB improvement in dynamic range over the first-generation R2R ladder DACs.