My DAC is asynchronous mode and has its own internal master clock, therefore, my question is: who is the master clock in this case?
Answer: The micro iUSB 3.0 & nano iUSB3.0 re-clock the USB data stream, not the audio data directly. It improves data integrity and makes sure data is received and decoded correctly. In asynchronous USB audio mode the audio clock is controlled by the DAC and the built-in clock.
