I've owned a dac 1 USB for a couple of years, and just took delivery of an HDR. Although I haven't compared them side to side, I have had them in the same system and have not noticed a difference between the two. On the other hand, the two systems couldn't be more divergent. Tannoy with vintage tubes vs Soundlab with high power solid state. Have you tried different power cords/conditioners, as they are sensitive to them?
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