High-Performance ESS ES9069Q DAC
RU3 is equipped with the ESS ES9069Q, a modern DAC chip using ESS’s latest HyperStream IV Dual DAC architecture. This high-performance DAC ensures clear, natural sound with excellent channel balance and low distortion. With its independent op-amp design and low-phase-noise crystal oscillator, RU3 brings a smooth and detailed presentation — ideal for portable Hi-Fi listening.
Quad Balanced Drive Architecture
RU3 uses a quad balanced amplifier structure with two TI OPA1602 op-amps and two SGM8262 low-noise amplifiers. This setup delivers clean output and wide dynamic range while keeping noise impressively low. Even with its small size, RU3 can easily power most earphones and portable headphones.
Balanced Output: 560 mW + 560 mW (32Ω, HYP Mode)
Single-Ended Output: 180 mW + 180 mW (32Ω, HYP Mode)
Dual Power Modes — Smart Efficiency
Users can select between two Power Modes: HYP and STD.
Hyper (HYP) Mode: Delivers full power output and extended dynamics.
Standard (STD) Mode: Operates at lower power for cooler, more efficient performance.
This flexibility allows RU3 to perform reliably whether connected to a smartphone or
computer, maintaining consistent sound quality under all conditions.
High-Resolution Audio and RISC-V Architecture
Powered by the SPV5068 processor, built on a RISC-V dual-core architecture, RU3 supports PCM 32-bit/768 kHz and native DSD512 playback. The processor ensures fast response, low distortion, and broad compatibility across major operating systems —including Android, iOS, Windows, and macOS.
Cayin Control App — Customizable Sound
Through the Cayin Control App, users can fine-tune their listening experience with advanced features such as:
- 10-Band Parametric EQ100-Step Volume Control
- 100-Step Volume Control
- Gain and Power Mode Selection
- The app provides full control and firmware updates, allowing users to personalize their sound effortlessly.
Elegant and Portable Design
Precision-machined from aerospace-grade aluminum, RU3 measures 60 × 25.4 × 11 mm and weighs only 24 g. It features a 0.96-inch IPS color display offering clear status visuals and customizable UI themes. Available in Black, Light Cyan, and Purple, RU3 combines refined aesthetics with everyday portability.
Specifications
| Processor | SB Audio Bridge SPV5068 (RISC-V Dual-Core) |
| DAC Chip | ESS ES9069Q ×1 |
| Output | 3.5mm Single-Ended / 4.4mm Balanced (PO/LO shared) |
| Power Output | 3.5mm: 180 mW + 180 mW (32Ω) 4.4mm: 560 mW + 560 mW (32Ω) |
| Supported Formats | PCM 32-bit/768 kHz, Native DSD512 |
| SNR | 115 dB (SE) / 117 dB (BAL) |
| THD+N | 0.0018% (SE) / 0.0015% (BAL) |
| Frequency Response | 20 Hz – 50 kHz (±0.2 dB) |
| Dimensions | 60 × 25.4 × 11 mm |
| Weight | 24 g |
| Colors | Black / Light Cyan / Purple |
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