Here are my impressions of the SMSL DP3.
Sound quality could be better, operational quirks, but decent as a transport.
First, the sound quality of the headphone amp.
It is better than many audio components that include a headphone amp as a secondary purpose (a large percentage of which sound rather poor), but I would rate it only at the upper end of the mediocre range. Via the balanced out, there is a decent amount of power...