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The basic idea of R-2R ladder is a matched pair of two resistors, the first is “ R ”and the… More details
The RU6 from Cayin is a portable USB DAC and headphone amplifier, allowing you to connect to your devices for high-quality, audiophile-grade sound wherever you are. The RU6 is compatible with iOS, MAC, Android, Windows, and can also be configured with DAPs via USB audio output.
The basic idea of R-2R ladder is a matched pair of two resistors, the first is "R" and the other is "2R" which has twice the value of R. To achieve 24bit R-2R decoding, you need 48 resistors ( 23xR and 25x2R ) for one channel, or 96 pieces of high precision resistors for stereo. R-2R is famous for its natural and realistic sound signature, and it’ll offer a very different experience to music lovers. To achieve 24-bit R-2R decoding, Cayin uses resistors that can deliver extreme precision and remain stable during temperature changes.
The R-2R DAC circuit in the RU6 is quite demanding on incoming data integrity and the digital volume control on mobile phones will inhibit the overall sound quality. When off-the-shelf volume options didn't meet the high precision, low noise, and low power consumption requirements of the RU6, Cayin developed their own discrete resistor array volume control. There are 0-99 steps though 9 sections of resistors and switching relays in the RU6, meeting all the requirements and transparency to maintain the natural soung signature of the R-2R DAC.
The RU6 has physical volume buttons for conventient control that also double as menu selection when entering mode settings. A 1-inch OLED screen displays playback information. The RU6 also has both 3.5mm unbalanced and a 4.4mm balanced headphone jack for maximum compatibility with headphones.
To minimize interference, the RU6 circuitry is divided into two, six-layered PCB, with digital and analog circuits installed on separate boards. This safegaurds the signal integrity, making sure that the noise from the reference clock and DSP will not affect the amplifier circuit.
The RU6 is compatible with the following digital audio sources:
|DAC||24bit Discrete R-2R|
|USB||Type C USB Audio Input|
|Digital Decoding||PCM: 44.1kHz ~ 384kHz DSD: DSD64/128/256|
|Control||Volume +/-, Mode|
|Headphone||3.5mm + 4.4mm Balanced|
|Display||0.96 inch 128x64 OLED|
|Accessories||USB C to C cable (shielded), USB A to C adapter|
|Dimension||65mm X 25.4mm X 13.7mm|
|Power rating||[email protected]||[email protected]|
|Freq. Response||20Hz-20kHz (+0.5dB)||20Hz-20kHz (+0.5dB)|
|THD+N||0.032% (1kHz, Output: 0.5V)||0.04% (1kHz, Output: 1V)|
|Dynamic Range||109dB (20Hz-20kHz, A-Weighted)||110dB (20Hz-20kHz, A-Weighted)|
|SNR||113dB (20Hz-20kHz, A-Weighted)||114dB (20Hz-20kHz, A-Weighted)|