FiiO KA17 blue

The FiiO KA17 combines a dual ESS ES9069Q DAC architecture with THX AAA 78+ certified amplification. This pocket-sized digital-to-analog converter redefines the standards of mobile audio reproduction by integrating technologies typically reserved for desktop equipment into an ultra-compact format of 64 × 12 × 27 mm, weighing just 33.5 grams.

Architecture and Technical Design

At the heart of the KA17 lies a rigorous engineering approach, with its two ESS ES9069Q conversion chips each dedicated to an audio channel. This symmetrical configuration ensures optimal stereo separation and eliminates crosstalk between channels. The THX AAA 78+ amplification uses eight operational amplifiers mounted in parallel, creating a redundant architecture that reduces distortion while increasing power reserves.

The physical separation of the digital and analog boards is a remarkable engineering choice for this format. This approach minimizes electromagnetic interference that can degrade the audio signal, which is especially critical in such a compact enclosure. The 16-core XMOS XU316 processor handles digital processing with minimal latency, while the dual crystal oscillator stabilizes the digital clock to reduce jitter.

Audio Performance and Usage Modes

The KA17 offers two distinct operating modes tailored to different usage scenarios. The normal mode, powered solely by USB, delivers up to 300 mW on the balanced 4.4 mm output, sufficient for most high-end portable headphones and in-ear monitors. The signal-to-noise ratio reaches 120 dB with a total harmonic distortion of 0.0005%, figures that rival many desktop DACs.

The desktop mode, activated by external power via the second USB-C port, transforms the KA17 into a true headphone amplifier. Power jumps to 650 mW at 32 ohms on the balanced output, allowing it to drive planar or high-impedance headphones. The signal-to-noise ratio improves to 126 dB with distortion reduced to 0.0004%, placing the KA17 on par with the best desktop solutions.

Connectivity and Compatibility

The KA17’s connectivity reflects its versatile use, with two USB-C ports serving distinct functions. The first handles both data and power simultaneously for simplified portable use, while the second allows for external power to maximize performance. This approach eliminates the usual compromises between portability and power.

The 3.5 mm output includes an optical SPDIF function, turning the KA17 into a digital transport for other audio equipment. The balanced 4.4 mm output fully leverages the dual DAC architecture for extended dynamics and optimized common noise rejection. UAC1.0 compatibility ensures instant recognition on most systems without driver installation.

User Interface and Control

The 2.3 cm OLED display provides detailed information on the current audio format, output level, and active settings. This physical interface allows for autonomous control without relying on external software, which is crucial for portable use. The FiiO app for Android unlocks advanced features such as a 10-band parametric equalizer, though this is limited to PCM files up to 192 kHz.

Native support for high-resolution formats up to 32-bit/768 kHz, as well as MQA and DSD512 support, positions the KA17 as a future-proof solution. The built-in equalizer allows for fine sound customization, particularly useful for correcting the specific characteristics of certain headphones or tailoring the sound to personal preferences.

Practical Applications and Use Cases

The KA17 excels in various usage scenarios thanks to its flexibility. In portable configuration, it transforms any smartphone or laptop into a high-fidelity audio source, ideal for business trips or mobile listening sessions with demanding headphones.

In desktop configuration, external power unlocks its full potential to drive magnetic planar headphones or high-impedance models. This versatility eliminates the need to own multiple devices for different usage contexts. The optical SPDIF function also allows it to be integrated into an existing audio chain as a digital transport.

Technical Specifications

Design and Architecture

• High-performance portable DAC and headphone amplifier
• Dual ESS ES9069Q DACs (one per channel)
• THX AAA 78+ amplification with 8 parallel operational amplifiers
• Multi-stage audio architecture (low-pass filter + buffer + amplifier)
• Separate digital and analog boards to minimize interference
• Physical control interface + 2.3 cm OLED display
• FIIO control app (Android only)

Audio Compatibility

• Files up to 32-bit / 768 kHz, MQA, and DSD512
• Customizable 10-band parametric equalizer (up to PCM 192 kHz / 24-bit)
• UAC1.0 compatible (plug & play, driverless)
• XMOS XU316 (16 cores): low latency, excellent compatibility
• Dual crystal oscillator for stable digital clock

Technical Performance

Desktop Mode (High Gain)

• Balanced output (4.4 mm)
  • Power: 650 mW @ 32 Ω
  • Frequency response: 20 Hz – 50 kHz (+/- 0.5 dB)
  • SNR: 126 dB
  • Distortion: 0.0004%
• Unbalanced output (3.5 mm)
  • Power: 320 mW @ 16 Ω
  • Frequency response: 20 Hz – 50 kHz (+/- 0.5 dB)
  • SNR: 123 dB
  • Distortion: 0.0015%

Normal Mode (High Gain)

• Balanced output (4.4 mm)
  • Power: 300 mW @ 32 Ω
  • Frequency response: 20 Hz – 50 kHz (+/- 0.5 dB)
  • SNR: 120 dB
  • Distortion: 0.0005%
• Unbalanced output (3.5 mm)
  • Power: 140 mW @ 16 Ω
  • Frequency response: 20 Hz – 50 kHz (+/- 0.5 dB)
  • SNR: 120 dB
  • Distortion: 0.0015%

Connectivity

• USB-C port for data and power
• Independent USB-C port for external power (desktop mode)
• 3.5 mm headphone output (SPDIF optical compatible)
• 4.4 mm balanced headphone output

Included Accessories

• USB-C to USB-C cable
• USB-C to USB-A adapter

General Information

• Dimensions: 64 × 12 × 27 mm
• Weight: 33.5 g