My music files on NWA45 is Flac and the clarity is something else indeed,not surprising as it is claimed Flac is a form of HI RES.and to me the Bluetooth option sounds better than listening to the device wired.To my mind it sounds more powerful in Bluetooth mode.Although i’m sure playing it through my Sony WH -1000xm2 Noise Cancelling Headphones as a lot to do with it because they support HI RES FILES.I don’t use Clear Audio really as using Bluetooth you can’t adjust the audio settings in the player.