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Compatibility: Khadas DAC sound card compatible Windows PC, Mac OS, Android, Linux PC, Volumio, LibreELEC, and Other SBCs. The XMOS USB Audio to ensure a rock-solid connection. We selected to use the XMOS XU211 microcontroller for its stability, powerful functionality,and its reliability. You can be sure that the Tone Board will just work when connected to most audio sources,such as computers and mobile media terminals. Professional Tuning: Professional instrument's APx555 was used for tuning the Tone Board.Khadas pc audio board has high-performance modular two-channel audio analyzer. Each power path is controlled by a separate ultra-low noise CMOS linear regulator with an OPA of ± 5.5V. USB External Hi-Fi Sound Card:XMOS XU208-128-QF48 (8 cores up to 500MIPS, compatible with USB 2.0.) multi-core RISC micro-controller and ESS flagship 32-bit stereo mobile audio DAC ES9038Q2M into a small PCB Ultra-low Phase Noise Clock Jitter: The SiTime ultra performance oscillator SiT820&8209 series with just 0.5ps phase jitter and output frequency stability as low as ± 10PPM. We chose it as a reference clock in our audio system so that the data clock jitter < 30ps. Extension: VIMs Versions (Khadas Tone + VIMs) connected through GPIO Pins; Generic Edition won't have GPIO Pins on board.One 30-Pins FPC Connector for 8 Channels Analog Output Extension; Two 10-Pins FPC Connectors for OLED Display and I2S Extension; Generic Edition won't have GPIO Pins on board.