If digital, you can currently pick up a Pangea audio ac14 se or ac14 power cord for your DAC depending on the one currently in use, for well under $100. Using a power cord like this designed for digital source applications can probably only help and not hurt.
I am noticing improvements similar to what you seek since applying the ac14se with my mhdt Constantine DAC. I did the upgrade needing to replace an existing damaged power cord and knowing that I have greatly improved performance of my setup in the past by systematically shielding against EM noise.
I am noticing improvements similar to what you seek since applying the ac14se with my mhdt Constantine DAC. I did the upgrade needing to replace an existing damaged power cord and knowing that I have greatly improved performance of my setup in the past by systematically shielding against EM noise.