I think by default, Mac OS upsamples everything to what the output interface can handle: which on the DAC might be 24/96
Using AudioMIDI Setup to set it to 16/44.1 (same as your ripped CDs) and see if there's an improvement.
Also I believe the DAC in question only has synchronous USB connection.
You should get better performance with a good async USB SPDIF box like a Wavelink HS or OffRamp or Audiophileo
Using AudioMIDI Setup to set it to 16/44.1 (same as your ripped CDs) and see if there's an improvement.
Also I believe the DAC in question only has synchronous USB connection.
You should get better performance with a good async USB SPDIF box like a Wavelink HS or OffRamp or Audiophileo