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TonGiesberts
TonGiesberts 45 minutes ago
You have to set quality to High. For instance setting resampling to 24 bit/96 kHz/High works flawlessly. Another option would be to convert the FLAC files from 16 to 24 or 32 bit without resampling using an audio editing program. This way the original quality of the files isn’t affected and the DAC is able to play the 24 or 32 bit files without resampling. I know this is lot of work depending the number of files but would give best performance.  
Audio DAC for RPi - Networked Audio Player using Volumio [160198]
Sprocket
Sprocket 3 hours ago
This mostly works. And quality is mostly very nice. But I get an annoying click or a pop at the start of playback. And I get another click or pop if I seek within the track. This seems worse when playing 16 bit source material than it does when playing 24 bit hi-sample rate audio, but it is still there in 24 bit sources also (which I would expect to pass through unmodified). If I play 24 bit sources without setting the sample rate conversion option then there is no pop/click.
Audio DAC for RPi - Networked Audio Player using Volumio [160198]
K. Jong
K. Jong 4 hours ago
I changed the switching power supply for the DAC to a well stabilized trafo supply. The result is a richer and more detailed musical performance. For me this is the switch from 'beautifull sound' to an impressive 'sound of music' :-))).
Audio DAC for RPi - Networked Audio Player using Volumio [160198]
TonGiesberts
TonGiesberts 5 hours ago
The source material being FLAC is not the problem, the fact they are 16 bit encoded is the problem. You can read about it in the main project text.  Using resampling to set the output to 24 or 32 bit is the correct solution then.
Audio DAC for RPi - Networked Audio Player using Volumio [160198]
Sprocket
Sprocket 6 hours ago
I just received my RPi DAC (ordered back in June 2017) and i installed the 2.82 image from the attachments above. It boots fine, the LCD works,  and it scanned all my music files OK. But it will only play MP3 files. If I try to play a 44.1KHz 16 bit FLAC file then I get nothing but a few clicks and then silence. After reading through the messages above I opened Volumio setup/ Playback Options amd went to the "Audio Resampling" section where I set Audio Resampling to "ON", Target bit depth to "32", Target Sample rate to "Native", and Resampling Quality to "Very High". After that it seems to play my Flac files OK. Is that the ideal/recommended solution?
Audio DAC for RPi - Networked Audio Player using Volumio [160198]