Cayin RU-9

The Cayin RU9 is a portable DAC and headphone amplifier built around Korg NuTube 6P1 tube technology and advanced digital audio processing. It combines tube and solid-state amplification in a compact CNC-machined metal chassis with a lightweight design and magnetic back panel.

Three timbre options are available: Classic Tube, Modern Tube, and Solid State. This allows you to choose between a rich tube character, a cleaner refined tube sound, or a more neutral solid-state presentation.

The RU9 uses a dual DAC setup with 2x AK4493SEQ chips and a 3rd generation 16-core XMOS XU316 USB processor. It supports UAC2.0 and UAC1.0, PCM up to 32-bit/768 kHz, and native DSD512 playback for high-resolution audio.

For wireless use, the RU9 includes Bluetooth 5.1 with support for LDAC, aptX HD, aptX LL, AAC, and SBC. It also offers 3.5 mm single-ended and 4.4 mm balanced headphone outputs, S/PDIF digital input/output, four-channel balanced amplification, and DC Hyper Mode with up to 1W output.

Features
NuTube 6P1 Tube Portable DAC And Headphone Amplifier
Three Timbre Options
Dual DAC Setup With 2x AK4493SEQ
3rd Generation XMOS XU316 USB Processor
PCM 32-Bit / 768 kHz Support
Native DSD512 Support
Four-Channel Balanced Headphone Amplification
Bluetooth 5.1 Connectivity
LDAC, AptX HD And AptX LL Support
DC Hyper Mode With 1W Output
3.5 mm Single-Ended And 4.4 mm Balanced Outputs
S/PDIF Digital Input And Output
0.96 Inch OLED Display
CNC-Machined Metallic Housing
Lightweight 150 g Design

Specifications
DAC Chips: 2 x AK4493SEQ
USB Processor: 3rd Generation 16-Core XMOS XU316
USB Protocols: UAC2.0 / UAC1.0
Audio Support: PCM 32-Bit / 768 kHz, Native DSD512
Bluetooth Version: 5.1
Bluetooth Codecs: LDAC, AptX HD, AptX LL, SBC, AAC
Headphone Outputs: 3.5 mm Single-Ended, 4.4 mm Balanced
Line Output / Phone Output Support: 3.5 mm And 4.4 mm
Digital I/O: S/PDIF Input / Output
Volume Control: 4-Channel JRC NJW1195A Electronic Volume Control Chipset
Output Mode: DC Hyper Mode
Weight: 150 g