Play lossless audio in Music on Mac
If you subscribe to Apple Music, you can play and download music encoded using the Apple Lossless Audio Codec (ALAC), which makes files smaller while preserving all of the original data in the file. In Apple Music, lossless music is available in two formats:
Lossless: Up to 24-bit, 48 kHz
Hi-Res Lossless: Up to 24-bit, 192 kHz
Albums and songs available in lossless have the Lossless icon 
next to them. If a track is playing in lossless, the icon also appears in the playback controls.
Note: Apple Music and lossless aren’t available in all countries or regions. See the Apple Support article Availability of Apple Media Services.
Choose lossless audio quality settings
Go to the Music app
on your Mac.Choose Music > Settings, click Playback, then do any of the following:
Turn on lossless audio: Select the “Lossless audio” checkbox. (You can see the Lossless icon for music whenever it’s playing.)
Select lossless audio quality when streaming songs: Choose one of the options from the Streaming pop-up menu.
Select lossless audio quality when downloading songs: Choose one of the options from the Download pop-up menu.
Change the lossless audio quality for a song
Go to the Music app
on your Mac.Stream a song from Apple Music.
Note: A song needs to be playing before you can change its audio quality.
Click
in the playback controls, then click Audio Quality Settings to change the lossless audio quality settings.