FiiO K17 R2R Desktop DAC and Network Headphone Amplifier
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FiiO K17 R2R Desktop DAC and Network Headphone Amplifier
Overview
The FiiO K17 R2R is a desktop DAC, headphone amplifier and network streamer built around FiiO's own 24+5-bit segmented R2R PRO resistor-ladder DAC. It's for listeners who want the rich, full-bodied R2R sound in a one-box system that streams over the network, takes digital and analog sources, drives demanding headphones with up to 4000mW balanced, and feeds a separate amp or powered speakers, all in a chassis with real wood side panels.
In the segmented R2R design, the upper five bits are decoded by 31 thermometer-coded resistors to reduce the error build-up of a traditional R2R ladder. The whole chain, from DAC through I/V conversion and low-pass filtering to the headphone amp, is fully differential, using TI op-amps. A fully discrete Class-AB headphone stage with ON Semiconductor MJE243/253 transistors delivers up to 4000mW per channel into 32 ohms balanced and 1850mW single-ended. A 35W low-noise linear supply with a custom transformer and TPA7A47/7A33 regulators powers it, and two Accusilicon AS318-L oscillators plus a FiiO-customized 12MHz oscillator handle clocking.
It plays from USB (up to 768kHz/32-bit and DSD256), coaxial, optical, analog line inputs, Bluetooth 5.1 with LDAC and aptX Adaptive, local playback and network streaming over Gigabit Ethernet or dual-band Wi-Fi. FiiO lists Roon Ready, AirPlay and Qplay certification, plus NAS playback over NFS and SMB through the FiiO Control app. A 64-bit, 360MHz DSP and ES9821Q ADC run a 31-band PEQ with AUTO EQ and Dual Engine Limiter controls. Outputs include 6.35mm, 4.4mm and XLR4 headphone jacks, XLR and RCA line outs and coaxial and optical digital outs, controlled by a 3.93-inch touchscreen, five knobs and an aluminum IR remote. The silver version has ash side panels and the black version has black walnut.
Simcoe Audio Video Insight
The K17 R2R has four output modes: headphones only, preamp out with adjustable volume, fixed line out, or headphones and preamp together, so it can run headphones and powered speakers from one box. If you keep a music library on a NAS, set up NFS or SMB playback in the FiiO Control app and you won't need a computer running. Lower the volume before switching from full-size headphones to IEMs, since the balanced outputs have a lot of power on tap.
More Info
Why the FiiO K17 R2R Stands Out
24+5-Bit R2R PRO DAC
Segmented ladder with 31 thermometer-coded resistors.
4000mW Balanced Output
Discrete Class-AB current-boosting amp.
Roon Ready, AirPlay, Qplay
Plus NAS playback over NFS and SMB.
31-Band PEQ
AUTO EQ and Dual Engine Limiter.
35W Linear Power Supply
Custom low-noise transformer.
Solid Wood Side Panels
Ash on silver, black walnut on black.
Buyer's Guide
Who It's For
- The R2R Listener: Wants resistor-ladder sound in a full system.
- The Network Streamer: Uses Roon, AirPlay or a NAS library.
- The Full-Size Headphone Owner: Needs up to 4000mW balanced.
How It Compares
The K17 R2R shares the FiiO K17's headphone outputs, power figures, network streaming and DSP-based PEQ. The K17 uses AKM's AK4191 and dual AK4499EX chips, while the K17 R2R uses FiiO's 24+5-bit R2R PRO DAC and a 35W linear supply, with Qplay and NAS playback listed and solid wood side panels.
FiiO K17 R2R Desktop DAC and Network Headphone Amplifier Specifications
| General Information | |
|---|---|
| Model | FiiO K17 R2R |
| Brand | FiiO |
| Product Type | Desktop R2R DAC, headphone amplifier and network streamer |
| Colours Available | Black (black walnut panels), Silver (ash panels) |
| Audio | |
| DAC | FiiO 24+5-bit segmented R2R PRO |
| Hardware | Master: X2000; MCU: ESP32-S3; USB: XMOS XU316; Bluetooth: QCC5125 |
| DSP / ADC | M21586Q (64-bit, 360MHz); ES9821Q ADC |
| Amplifier | Discrete Class-AB, MJE243/253 current boost |
| PEQ | 31-band; AUTO EQ; DEL limiter/compressor |
| USB | Up to 768kHz/32-bit, DSD256 (native); MQA full decoding |
| Coaxial In | Up to 192kHz/24-bit, DSD64 |
| Optical In | Up to 96kHz/24-bit |
| Streaming | Up to 384kHz/32-bit, DSD256 (DoP) |
| Local Playback | Up to 384kHz/32-bit, DSD256 |
| Bluetooth | 5.1 receiver; LDAC, aptX Adaptive, aptX HD, aptX LL, aptX, SBC |
| Headphone Output (Ultra High Gain) | |
| 6.35mm | 1850mW+1850mW @ 32Ω; 240mW+240mW @ 300Ω |
| 4.4mm / XLR4 Balanced | 4000mW+4000mW @ 32Ω; 950mW+950mW @ 300Ω |
| Line Outputs | |
| XLR3 Balanced | 5Vrms |
| RCA | 2.5Vrms |
| Coaxial Out | Up to 192kHz/24-bit, DSD64 |
| Optical Out | Up to 192kHz/24-bit |
| Performance | |
| SNR | ≥125dB (A-weighted) |
| THD+N | <0.0052% (1kHz/-8dB @ 32Ω) |
| Noise Floor | <2.6µV (A-weighted) |
| Frequency Response | 20Hz to 80kHz (<3dB) |
| Connectivity | |
| Inputs | USB-C, optical, coaxial, analog line in (single-ended and balanced), Bluetooth |
| Network | Gigabit Ethernet; 2.4GHz/5GHz Wi-Fi; Roon Ready, AirPlay, Qplay; NAS (NFS/SMB) |
| Headphone Outputs | 6.35mm, 4.4mm balanced, XLR4 balanced |
| Output Modes | PO, PRE, LO, PO+PRE |
| Control | 3.93-inch touchscreen, 5 knobs, IR remote, FiiO Control app |
| Physical Specifications | |
| Power Supply | 35W linear, custom transformer |
| Dimensions | About 245 x 223 x 69mm |
| Weight | About 2900g |
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