Report of problems with SU-1.
If you are repeatedly playing a DSD album as background music for hours using a USB connection, the USB connection may be cut off and playback may stop without you realizing it. I purchased two SU-1s, and both have the same symptoms. The same problem occurs even if you change your PC to another model. But it does not occur at all with PCM albums. Also, the symptoms do not change for any file from DSD64 to DSD512. I have several other DACs, but this does not occur at all with them, so I think it is a problem specific to the SU-1. The USB driver is the latest V5.58. Well, it's a rare phenomenon, so I won't worry about it. There is nothing wrong with OPT/COAX.