While the DAC of both RU6 and RU7 are resistor-network based, the 96 pieces (2x48) resistor network in RU6 is a stereo (2-ch) R-2R implementation, the 128 pieces (4x32) resistor network in RU7 is a fully balanced 4-ch DAC design. Although we need to convert the DAC output to single-ended for subsequent processing, the fully balanced DAC can render more detail and preserve more dynamics of the music. If we treat R-2R and 1-Bit as two different but equal engineering approaches to convert the digital audio bitstream to the analog waveform, the fully balanced design in RU7 will still be a step up from the singled-end design in RU6.

Cayin RU7 1-Bit Resistor Network USB Dongle DAC / Headphone Amp:
Type: USB Dongle DAC / Headphone Amp
DAC Architecture: Fully Balanced 1-Bit Discrete Resistor Network
Components: 1/1000 ultra-high precision TCR25 low-temperature coefficient thin film resistors

Audio Support:
Native Decode: DSD64/128/256, PCM up to 384kHz
Processing: User-selectable All-to-DSD (DSD64/128/256)

Controls & Circuit:
Volume Control: 100 steps, 3-segment High Precision Resistor Array
Controls: Hardware Volume +/- button
Gain Control: High/Low gain
PCB: TWO 6-layer, digital and analog circuits on separate boards

Output Power:
3.5mm Single-Ended: 160mW per channel at 32Ω
4.4mm Balanced: 400mW per channel at 32Ω

Compatibility:
Systems: Android, iOS, macOS, Windows 7/8/8.1/10, DAP with USB Audio output

Design & Build:
Chassis: Compact and seamless CNC aluminum chassis
Display: 1” 128x64 OLED screen
Dimensions: 66mm x 24mm x 12mm
Weight: ~25g net weight

Input:
Input: USB-C

Outputs:
Outputs: 3.5mm single-ended, 4.4mm balanced headphone jacks

Included Accessories:
USB-C to USB-C cable, USB-C to USB-A adapter, Green Leather case

Optional Accessory:
USB-C to Lightning cable CS-L2C (sold separately)