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Cayin RU7: The New Benchmark in Portable Audio Dongles
The Cayin RU7 is the latest innovation in USB DAC dongles, a significant upgrade to the popular RU6. With 4.4mm balanced and 3.5mm single-ended outputs, this compact device delivers impressive power of up to 400mW through its balanced output. Equipped with a discrete 1-bit DAC, the RU7 redefines portable audio experiences, making it an ideal choice for discerning audiophiles.
Power in a Compact Size
Despite its small size, the RU7 does not compromise on performance:
- 4.4mm balanced output: 400mW at 32 Ohms.
- 3.5mm single-ended output: 160mW at 32 Ohms.
The output voltage is optimized to preserve the detail and dynamics of the discrete 1-bit DAC while keeping noise and distortion to a minimum.
1-Bit Discrete DAC for DSD Audio
The RU7 employs a micro-miniaturized DAC circuit with a fully differential 4-channel architecture:
- Converts all digital signals to the DSD format (All-To-DSD) before processing through the discrete DAC.
- Supports PCM up to 384kHz and native DSD from DSD64 to DSD256.
- Signals pass through a 3-level active filter before converting to single-ended output, ensuring faithful and precise reproduction.
Powerful Parallel Amplification
The amplifier design features a dual-parallel amplification scheme for a high-powered 4-channel balanced output. This design enhances power output and ensures optimal sound quality, catering to a wide range of headphones, including demanding models.
Precise Volume Control
The RU7 incorporates a 100-step volume control system based on a discrete resistor network and relay switches. This system offers:
- Fine adjustments for sensitive IEMs.
- A wide volume range with low noise and high precision.
Dual PCB Design
To minimize interference, the internal circuit is divided into two six-layer PCBs:
- Separate digital and analog boards.
- Isolation from reference clock and DSP noise, ensuring audio signal purity.
Low Power Consumption
The discrete resistor DAC design and optimized amplification circuit result in reduced power consumption, approximately 110-120mA. This ensures compatibility with a variety of digital sources:
- Android devices.
- iOS and iPadOS (with adapter).
- Computers running macOS and Windows.
- Digital audio players with USB output.
OLED Display and Portable Design
The 128x64 pixel OLED screen provides clear and legible playback information:
- Compact and lightweight design with beveled edges for comfortable handling.
- Curved finish for a sleek and modern look.
Included Accessories
The RU7 comes with a complete set of accessories:
- RU7 dongle.
- Type-C cable.
- USB A-C adapter.
- Handmade magnetic leather case.
- User manual.
A Refined Audio Experience
The Cayin RU7 is more than just a USB DAC dongle; it is a high-performance portable device offering premium sound quality, versatile compatibility, and exceptional design. Rediscover portable audio with this new benchmark in sound technology.
Specifications
DAC: Discrete 1-Bit DSD DAC
USB: Type-C
Digital decoding: PCM 44.1kHz to 384kHz, native DSD64/128/256
All to DSD: Native DSD64/128/256
Chassis: CNC aluminum
Headphone output: 3.5mm single-ended
Line-out: 4.4mm balanced
Display: 0.96-inch 128x64 OLED
Dimensions: 66mm x 24mm x 12mm
Weight: 25g
3.5mm Headphone Output Specifications
Output power: 160mW @ 32 Ohms
Frequency response: 20Hz - 42kHz
THD+N: 0.006%
Dynamic range: 115dB
SNR: 114dB
Channel separation: 76dB
Output impedance: 0.5 Ohms
4.4mm Headphone Output Specifications
Output power: 400mW @ 32 Ohms
Frequency response: 20Hz - 42kHz
THD+N: 0.006%
Dynamic range: 115dB
SNR: 112dB
Channel separation: 92dB
Output impedance: 1.0 Ohms
3.5mm Line Output Specifications
Output power: 1.2Vrms @ 32 Ohms
THD+N: 0.02%
Dynamic range: 114dB
SNR: 113dB
Channel separation: 100dB
Output impedance: 0.5 Ohms
4.4mm Line Output Specifications
Output power: 2.4Vrms @ 32 Ohms
THD+N: 0.02%
Dynamic range: 114dB
SNR: 113dB
Channel separation: 102dB
Output impedance: 1.0 Ohms
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