Here is the spec on Aqua R2R DAC:
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0.016% translates into a SINAD of 76 dB. Yes, just 76 dB. That would put it near the bottom of all DACs ever tested. In critical listening it will likely add harmonic distortion that makes the highs more distorted.
And oh, they measured that THD+N at -10 dB. Likely the distortion rises even more at full scale.
The Aqua DAC has built up a reputation among high-end audiophiles as something great. If the above are the specs, that reputation is completely misplaced.