To ensure that the DacMagic 100 is receiving Hi-Res audio, you may need to adjust some of the sound settings on your Mac.
Note: The following was carried out on a Mac using macOS High Sierra. These instructions should be suitable for other compatible macOS versions.
If your DacMagic 100 is operating in USB Audio Class 1.0 mode, set the output sample rate to 96,000Hz.
If your DacMagic 100 is operating in USB Audio Class 2.0 mode, set the output sample rate to 192,000Hz.