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Cayin RU9 Portable Tube DAC/Amp Redefines Mobile Hi-Fi

Editorial Staff by Editorial Staff
June 23, 2025
Reading Time: 2 mins read
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cayin-ru9-portable-usb-dac-head-amp-dongle

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Cayin, a titan in high-fidelity audio, has unveiled the RU9, a groundbreaking portable USB-DAC and headphone amplifier that brings tube-driven sound to the palm of your hand. Set to launch in mid-July 2025 at €598, the RU9 combines vintage tube warmth with cutting-edge digital precision, making it a game-changer for audiophiles on the go.

Korg Nutube 6P1 vacuum tube

Weighing just 150 grams and measuring a compact 100 x 70 x 15 mm, the RU9 is Cayin’s smallest device to incorporate the innovative Korg Nutube 6P1 vacuum tube, delivering the rich, saturated sound that hi-fi enthusiasts crave. Its CNC-milled aluminum chassis, complete with a magnetized back for easy attachment to smartphones, exudes both practicality and elegance. A knurled volume wheel and a clear display showing volume, sample rate, connection type, and battery level enhance usability, while a 2000 mAh battery offers up to 4.7 hours of playback.

Dual AK4493SEQ DAC

The RU9’s audio prowess stems from its dual AK4493SEQ DACs in a dual-mono configuration, paired with a 16-core XMOS XU316 processor, supporting high-resolution audio up to 32-bit/768kHz and DSD512. Users can toggle between three distinct sound profiles—Classic Tube for full tube warmth, Modern Tube for a cleaner, brighter tone, and Solid-State for neutral, transistor-based clarity—offering unmatched versatility for tailoring sound to personal taste or headphone pairing.

  cayin-ru9-portable-usb-dac-head-amp-dongle-3

Excellent connectivity

Connectivity is a strong suit, with USB-C (UAC 1.0/2.0) for compatibility with smartphones, tablets, computers, and digital audio players, alongside Bluetooth 5.1 supporting high-definition codecs like LDAC and aptX HD. Dual headphone outputs (3.5mm single-ended and 4.4mm balanced) deliver up to 1W into 32 ohms in DC mode, ensuring ample power for demanding headphones.

Gen5 3-stage amplification architecture

Cayin’s innovative design extends to its Gen5 3-stage amplification architecture, blending tube and solid-state circuitry for dynamic, nuanced sound. Reviewers have lauded its ability to rival desktop DACs, with one calling it a “new age of dongle” for its fusion of portability and high-end performance. The magnetic housing and included L-shaped USB-C cable further enhance its practicality for mobile use.

cayin-ru9-portable-usb-dac-head-amp-dongle-5

Available from mid-July 2025 through authorized retailers like Hifonix and Cayin’s official channels, the RU9 sets a new standard for portable audio, proving that true hi-fi sound can travel anywhere. For audiophiles seeking uncompromising quality in a compact package, the Cayin RU9 is a must-have.

Tags: CayinCayin RU9Portable DACPortable head-amp
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Editorial Staff

Editorial Staff

An exceptional collection of pencils, pens and keyboards, all equally possessed by audio and video. In some dark den, hidden from all women, our editorial staff write and type about their infinite love of the audiovisual. Please, have some compassion!

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