I do not use Synology's packaged media servers anymore as I find Minimserver sounding better. Primarily the NAS is for the Lumin Network Music Player but I am so happy about the easy integration with the ZX1.
I would expect it to be bit perfect, although the scroll down page on the ZX1 does not give sampling rate details when used over DLNA. The Synology is definitely bit perfect, so there is no downsampling from there, as DSD files cannot be read by the ZX1.
Just wondering if the ZX1 does but listening back to back the same 24/192 file....I am guessing not.
The convenience is incredible having access of over 3TB of music.
I should add that the Synology Packaged Media apps does not play DSD files
I did mention earlier in the thread that I am a bit suspicious about downsampling. When you play the flac file directly on the ZX1 (or 886/887) it shows a little HR (hi-res) indication. But when playing via DLNA it does not.