Cayin RU3 Portable USB DAC Earphone Amplifier Support 4.4mm 3.5mm Plug

Brand: Cayin

$149.99 USD

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Color Black Light Cyan Purple

Cayin RU3 Portable USB DAC & Headphone Amplifier

Compact Powerhouse for High-Fidelity Listening

The Cayin RU3 is a high‑performance portable USB DAC and headphone amplifier that fits comfortably in the palm of your hand. Built around the flagship ESS ES9069Q DAC chip, the RU3 delivers studio‑grade decoding, precise signal amplification, and exceptional output power—all in a lightweight, 24‑gram aluminum body. In HYP (Hyper) Mode, it produces up to 560 mW of balanced output, driving demanding headphones and IEMs with authority and dynamic control.

Available Colors

Black | Purple | Light Cyan

Flagship ESS ES9069Q DAC Architecture

Equipped with the industry‑leading ESS ES9069Q, the RU3 adopts the latest HyperStream IV dual‑DAC design and advanced Sabre HiFi technology. Each channel uses an independent amplifier stage for superior signal separation and precise sound reproduction.

Supports PCM up to 768 kHz / 32 bit
Native DSD512 decoding without conversion
Dynamic range > 130 dB – studio‑grade performance
THD+N as low as 0.0015% – virtually distortion‑free output

Independent Clock & Power Design

The RU3 features dedicated LDO power regulation and an ultra‑low‑phase‑noise crystal oscillator to minimize distortion and crosstalk. This ensures a spacious, three‑dimensional soundstage with richer detail retrieval and greater sonic realism.

Four‑Channel Fully Balanced Amplification

A dual TI OPA1602 precision op‑amp handles I/V conversion and line output, paired with dual SGM8262 low‑noise amplifiers (3.5 nV/√Hz, 110 dB gain). Together, they form a fully balanced four‑channel amplification architecture for uncompromising signal control and dynamic power delivery.

4.4 mm balanced output: 560 mW + 560 mW @ 32 Ω (HYP Mode)
3.5 mm single‑ended output: 180 mW + 180 mW @ 32 Ω (HYP Mode)
Output impedance: 0.6 Ω (SE) / 1.2 Ω (balanced)

In HYP Mode, the RU3 expands dynamic range while keeping distortion ultralow, offering a wide and precisely positioned soundstage for immersive, high‑energy performance.

SPV5068 RISC‑V Dual‑Core USB Processor

USB input is managed by the SPV5068 dual‑core RISC‑V processor, optimized for low latency and high efficiency. It ensures bit‑perfect data transfer and uncompromised integrity from source to DAC. The RU3 offers broad cross‑platform compatibility and plug‑and‑play usability.

Supports UAC 1.0 / UAC 2.0 mode switching
Compatible with Android, iOS, Windows, and macOS
Driver‑free operation via standard UAC protocol
Also supports PlayStation 5 and Nintendo Switch platforms

Ultra‑Portable CNC‑Machined Aluminum Design

Precision‑milled from aerospace‑grade aluminum, the RU3 measures only 60 × 25.4 × 11 mm and weighs just 24 g. Its anodized finish forms a dense, durable oxide layer that resists wear while maintaining a premium metallic feel—perfect for everyday portability in your pocket or keychain setup.

0.96‑Inch IPS Color Display

A vivid 0.96″ IPS touch display provides real‑time information such as volume level, gain, and power mode. Users can intuitively adjust settings without needing to access a smartphone or PC, ensuring total control at a glance.

Cayin Control App – Your Sound, Your Way

10‑band parametric EQ for fine‑tuning frequencies to personal taste
100‑step volume control for ultra‑precise listening adjustments
Gain and power mode selection optimized for different earphones and environments