Note: We currently only have black in stock.

32-Bit / 768 kHz USB DAC Dongle

The Cayin RU3 is a portable USB DAC and headphone amplifier dongle that combines an ESS ES9069Q DAC, SPV5068 RISC-V dual-core audio processor, 32-bit / 768 kHz PCM support, native DSD512 playback, 3.5mm single-ended and 4.4mm balanced outputs, HYP / STD power modes, app control, and a 0.96-inch IPS color display in a compact CNC aluminum chassis.

High-resolution decoding

The RU3 uses a single ESS ES9069Q DAC with a dual-channel design based on ESS HyperStream IV Dual DAC architecture and SABRE HiFi technology. It supports PCM up to 32-bit / 768 kHz and native DSD512, giving you broad high-resolution file support whether you're listening from a phone, laptop, or tablet. 

Fully-balanced power

The RU3 pairs two TI OPA1602 op-amps with two SGM8262 low-noise headphone amplifier chips to create a fully-balanced quad-drive architecture. That means the left and right channels are separated, which helps preserve imaging, channel balance, and clean output. In Hyper Mode, the 4.4mm balanced output delivers up to 560mW + 560mW at 32Ω, while the 3.5mm single-ended output delivers up to 180mW + 180mW at 32Ω.

Two power modes

The RU3 gives you two ways to manage output. HYP Mode unlocks the RU3’s higher power output for headphones that need more drive, while STD Mode lowers power draw and heat for everyday listening from mobile devices. 

Phone and line outputs

The RU3 includes both 3.5mm single-ended and 4.4mm balanced outputs, and both can operate as phone output or line output. Use phone output when connecting headphones or IEMs directly. Use line output when sending signal to an external amplifier.

App-based control

Through the Cayin Control App, the RU3 gives you access to volume, output mode, channel balance, gain, digital filters, UAC mode, UI themes, and EQ. The app includes 100-step volume control, two power modes, two gain levels, five digital filters, four UI themes, 20-step channel balance, and 10-band parametric EQ. 

Lossless EQ customization

The 10-band high-precision lossless EQ lets you make more detailed adjustments than a basic bass-and-treble control. You can reduce a sharp region, add a little weight to lean headphones, or save custom EQ profiles for different IEMs and headphones. 

Clear onboard display

The 0.96-inch IPS color display shows decoding status and system settings at a glance. Instead of guessing which mode you're in, you can check volume, gain, EQ, power mode, UAC mode, and playback format directly on the device. The physical multifunction buttons give you quick control without having to reach for the app every time.

Broad device compatibility

The RU3 supports UAC 1.0 and UAC 2.0, helping it work across Android, iOS, Windows, and macOS devices. UAC 1.0 also supports driver-free use with compatible gaming devices such as PS5 and Nintendo Switch. That gives you one small DAC/amp for music, movies, travel, and gaming without keeping separate adapters for every device.

Product highlights

• Portable USB DAC and headphone amplifier dongle
  
• ESS ES9069Q DAC with HyperStream IV Dual DAC architecture
  
• SPV5068 RISC-V dual-core audio processor
  
• Supports PCM up to 32-bit / 768 kHz and native DSD512
  
• Fully-balanced quad-drive architecture
  
• 3.5mm single-ended and 4.4mm balanced outputs
  
• PO/LO shared output design for headphones and external amplifiers
  
• Up to 560mW + 560mW at 32Ω from the 4.4mm balanced output
  
• HYP / STD dual power modes
  
• 10-band high-precision lossless EQ through Cayin Control App
  
• 100-step volume control, two gain levels, five digital filters, and 20-step channel balance
  
• 0.96-inch IPS color display with four UI themes
  
• UAC 1.0 and UAC 2.0 support
  
• CNC aluminum chassis in Black, Purple, and Light Cyan

Specs

• USB audio bridge: SPV5068 RISC-V high-performance dual-core heterogeneous audio architecture
  
• DAC chip: ES9069Q ×1
  
• Op-amp IC: OPA1602 ×2
  
• Headphone amplifier IC: SGM8262 ×2
  
• Display: 0.96-inch IPS LCD
  
• Headphone output: 3.5mm single-ended + 4.4mm balanced, PO/LO shared
  
• Line output: 3.5mm single-ended + 4.4mm balanced, PO/LO shared
  
• Dimensions: 2.36 × 1 × 0.43 in (60 × 25.4 × 11 mm)
  
• Net weight: 0.85 oz (24 g)
  
• Color: Black
  
• 3.5mm power output: 180mW + 180mW at 32Ω, THD+N ≤ 1%
  
• 3.5mm THD+N: 0.0018% at 32Ω, 1kHz, output 1.0V rms
  
• 3.5mm SNR: 115dB, 20Hz–20kHz, A-weighted
  
• 3.5mm dynamic range: 115dB, 20Hz–20kHz, A-weighted
  
• 3.5mm frequency response: 20Hz–50kHz, ±0.2dB
  
• 3.5mm crosstalk: 82dB
  
• 3.5mm output impedance: 0.7Ω
  
• 4.4mm power output: 560mW + 560mW at 32Ω, THD+N ≤ 1%
  
• 4.4mm THD+N: 0.0015% at 32Ω, 1kHz, output 2.0V rms
  
• 4.4mm SNR: 117dB, 20Hz–20kHz, A-weighted
  
• 4.4mm dynamic range: 117dB, 20Hz–20kHz, A-weighted
  
• 4.4mm frequency response: 20Hz–50kHz, ±0.2dB
  
• 4.4mm crosstalk: 105dB
  
• 4.4mm output impedance: 1.2Ω
  
• UAC mode: UAC 1.0 and UAC 2.0
  
• Supported formats: UAC 1.0 driver-free operation, UAC 2.0 up to 32-bit / 768 kHz
• PCM and DSD512 native playback

What’s included

• Cayin RU3 portable USB DAC and headphone amplifier dongle
  
• Audiophile-grade anti-interference Type-C cable