FiiO KA5

The FiiO KA5 combines sophisticated technical architecture with ergonomics designed for the discerning user. With its dual Cirrus Logic CS43198 DACs and integrated OLED display, it stands out as a benchmark in its category, delivering desktop-level performance in an ultra-compact format weighing just 19 grams.

Technical Architecture and Audio Performance

At the heart of the KA5 lies a remarkable implementation of the dual Cirrus Logic CS43198 DACs. This truly balanced architecture achieves genuine channel separation, unlike the “pseudo-balanced” solutions offered by many competitors. Each DAC processes a channel independently, ensuring minimal crosstalk and an impressively precise stereo image.

Amplification is handled by dedicated SGM82615 chips, specially selected for their linearity and low noise floor. This DAC-amplifier pairing delivers a sound signature that reviewers unanimously describe as “natural, transparent, and engaging.” The measured frequency response is perfectly flat across the entire audible range, with no artificial coloration.

The technical performance is consistently impressive: total harmonic distortion below 0.00037%, signal-to-noise ratio exceeding 128 dB on the balanced output, and a generous output power reaching 265 mW at 32 ohms. These figures place the KA5 on par with the best desktop audio interfaces, all in a device that fits in the palm of your hand.

Premium Design and Ergonomics

The KA5’s construction reflects a clear high-end approach. The aluminum alloy chassis is adorned with tempered glass surfaces on both the front and back, providing a sense of solidity and elegance rarely seen in this category. The angular lines and carefully crafted texture make it a desirable object, far from the utilitarian look of many portable converters.

Despite its compact dimensions of 56.3 × 22 × 12 mm, the KA5 features a perfectly readable OLED display and three physical buttons for navigation. This physical approach is a smart choice, allowing for direct control without relying on a mobile app. The balance is remarkable: at just 19 grams, it disappears in your pocket while maintaining a reassuring presence in hand.

Versatility and Broad Compatibility

The KA5 excels in versatility. Its USB-C connectivity ensures native compatibility with most modern smartphones, tablets, and computers, while the included OTG cables extend compatibility to Lightning and USB-A devices. This universal approach makes it an ideal companion for the on-the-go audiophile using multiple sources.

Support for high-resolution formats up to 32-bit/768 kHz PCM and DSD256 ensures full compatibility with the most demanding music libraries. The converter is also capable of powering full-size headphones like the Sennheiser HD660S, while remaining perfectly silent with the most sensitive in-ear monitors. This range of use, rare in the portable segment, avoids the usual compromises.

User Interface and Intuitive Controls

The KA5’s OLED display is a true differentiator. Unlike the many “blind” converters on the market, it clearly shows the current audio format, volume level, and allows access to advanced settings directly via the physical buttons. This standalone approach eliminates reliance on a mobile app, which is often a source of frustration.

The configuration options are surprisingly extensive for a device of this size: choice between high and low gain, activation of the optical S/PDIF output, screen brightness adjustment, auto-off timer, display orientation, volume control type, digital filters, channel balance, and amplification mode. This wealth of features rivals much larger desktop DACs.

Practical Use and Use Cases

In daily use, the KA5 proves to be remarkably practical. Its low power consumption (113 mA in operation) preserves the battery life of mobile devices, while its robust construction withstands frequent handling. The absence of fragile protruding components makes it a reliable travel companion.

For on-the-go listening, the KA5 literally transforms a smartphone into a high-fidelity audio source. At the desk, connected to a computer, it is a worthy replacement for many dedicated audio interfaces. Its S/PDIF optical function even allows it to be used as a digital bridge to an external DAC, multiplying integration possibilities within an existing audio setup.

Technical Specifications

Audio Processing and Compatibility

• Dual digital-to-analog converter: Cirrus Logic CS43198
• Dual amplification: SGM 86615D
• Audio compatibility: PCM up to 32-bit / 768 kHz, DSD256

Interface and Controls

• OLED display: clear display of settings and playback information
• Physical controls: simple and intuitive navigation
• Control app: FiiO Control (Android only)

Audio Performance

Balanced output (4.4 mm jack)

• Output power: 265 mW at 32 ohms
• Frequency response: 20 Hz – 50 kHz (± 0.2 dB)
• Signal-to-noise ratio: 130 dB
• Total harmonic distortion: 0.00024%

Unbalanced output (3.5 mm mini-jack)

• Output power: 122 mW at 32 ohms
• Frequency response: 20 Hz – 50 kHz (± 0.2 dB)
• Signal-to-noise ratio: 126 dB
• Total harmonic distortion: 0.00035%

Connectivity and Outputs

• Input: USB-C (power and data)
• Headphone outputs:
  • 3.5 mm mini-jack (also optical SPDIF output via setting)
  • 4.4 mm balanced jack

Included Accessories

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

Physical Characteristics

• Dimensions: 56.3 x 12 x 22 mm
• Weight: 19 g