To enjoy the benefit of DSD quality, you need a very good DAC inside the player (RCA or XLR audio analog output). Unfortunatly, the DAC and Power Supply of the Zappiti Player 4K are not good enough to enjoy the benefit of DSD files. In Digital output, the DSD files are converted 2 times: first in PCM and then in Analog. It is not a good way. So, to enjoy the ultimate quality of DSD files, you need to convert in analog directly and the Zappiti Player 4K is not made for that. On the Zappiti Player 4K, it is better to use other lossless files such as FLAC or AIFF with Digital Output.