Like many of you, I have spent MUCH more money on getting audio to my amp, than the amp itself. All of my music is streamed from my local music library, or from Tidal or Spotify. No vinyl here! The following reviews (not mine) give a detailed review of the HiFiBerry DAC+ Pro, with real measurements of the quality. I use two of these with both of my Dynacos, and the sound is superb. I get full remote volume control, and a lot of different software options. When people hear it, they are quite amazed, that such an inexpensive box, can sound so good.
http://archimago.blogspot.com/2016/09/preview-set-up-raspberry-pi-3-model-b.html
http://archimago.blogspot.com/2016/10/measurements-raspberry-pi-3-hifiberry.html
Mike
http://archimago.blogspot.com/2016/09/preview-set-up-raspberry-pi-3-model-b.html
http://archimago.blogspot.com/2016/10/measurements-raspberry-pi-3-hifiberry.html
Mike