I have an SA-50, which I purchased new about a month ago. One of the major reasons I bought it was because of the versatility it offered, serving as both a CD/SACD player and a DAC (with both USB and Digital input). Truly, IMHO, a one box solution.
For critical listening, I use the CD/SACD player, and for casual and background listening, I use Sonos, which I channel through the digital input of the SA-50, utilizing it's DAC. To my ears, there is very little difference in the quality of the music provided by either source.....and I'm very pleased with my purchase. Great build quality, and I'm still expecting the quality of the music to improve, as the break in time on these units is supposed to be in the neighborhood of 500 hours. Hope this helps.
For critical listening, I use the CD/SACD player, and for casual and background listening, I use Sonos, which I channel through the digital input of the SA-50, utilizing it's DAC. To my ears, there is very little difference in the quality of the music provided by either source.....and I'm very pleased with my purchase. Great build quality, and I'm still expecting the quality of the music to improve, as the break in time on these units is supposed to be in the neighborhood of 500 hours. Hope this helps.