The Cayin RU6 Dongle DAC features a custom designed 24bit discrete R-2R resistor network circuit capable of decoding up to 384kHz. The hardware volume control buttons are supported by a sophisticated resistor ladder volume circuit and the user can choose between non-oversampling and oversampling modes via a simple menu setting. Two headphone outputs, 3.5mm and 4.4mm are provided, allowing you to connect RU6 to a wide range of headphones on the market.
Design
RU6 physically separates the digital signal processing part and the digital-to-analog audio signal conversion and amplification part through two 6-layer PCBs. The R2R is constructed with the entire analog audio circuit to ensure that the analog audio In the process of transmission and amplification, the signal is not interfered by digital signals, clock signals, etc., so as to obtain a cleaner audio signal. The Cayin RU6 also offers two levels of gain to enhance performance with a variety of headphones. All this is packaged in a case weighing only 28g.
The integrity of the input data is very important for the DAC circuit of the R-2R. The digital volume of smartphones has a great effect on sound quality. Off-the-shelf volume options cannot meet the RU6’s high precision, low noise, and low power requirements. Therefore, we have developed our own discrete resistor array volume control. The 0-99 step volume control with 9 segment resistors and switching relays * meets all RU6 requirements, is transparent and maintains the natural sound signature of the R-2R DAC.
Display
The Cayin RU6 portable DAC and headphone amplifier just needs to be connected to your smartphone, tablet or computer to take charge of the signal conversion. Its OLED screen located on the upper side allows you to check the sampling of files, as well as the volume level. This denier also adjusts very precisely on a level of 99 levels thanks to the installation of 9 resistors which guarantee a fluid variation without loss of quality or dynamics. Finally, it is also possible to easily change the operating mode of the Cayin RU6 DAC using a dedicated command. It is then possible to activate the oversampling system to enjoy even more precise listening.
Features
To minimize audio signal interference, Cayin split the RU6 circuit into two 6-layer boards. At the same time, digital and analog circuits are installed on separate boards. This ensures the integrity of the audio signal and ensures that noise from the reference frequency and DSP does not enter the amplification circuit. In addition, this architecture provides sound without artifacts. All this, combined with the R-2R architecture, allows the RU6 to support high-resolution audio formats with support for 384kHZ PCM and DSD 64/128/256.
Audio Controller
The R-2R circuit is very demanding on the integrity of the sound, while the digital volume control of the mobile phone will degrade the sound quality and result in poor sound quality. When the volume options cannot meet the high precision, low noise, power consumption requirements of the Cayin RU6. The company has developed separate discrete resistor array for their own control. Volume control via 99 steps with 9 segments of resistors and switching relays, meeting all the requirements of Ru6 and relays to maintain the characteristic natural sound of the R-2R circuit.
Finishing the circuit
To optimize the internal design, the circuit on the Cayin RU6 R-2R is divided into 2 6-layer pcb circuits, with the decoder and amplifier placed on a separate circuit. To be able to avoid background noise from the DSP into the amplifier circuit.
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Where To Buy
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