Just a sidebar here, I'm speculating that you are engaging Airplay to get iTunes on your PC, or other devices, wirelessly to amp input. In this scenario the amp's DAC is doing conversion to analog. To get the best results set iTunes preferences to Windows Audio Session and also to match output at the bit and bite rate for the highest res files in iTunes Library to your amp's DAC processing capability, if you will ever be sending from usb to amp. Now, with Windows Audio Session in play you will be able to run some PC tasks while music is playing without having the music distrupted. I do not have Airplay, I have Airport Express which precedes Airplay enabled devices, and yet I can say with certainty that even though my PC to Airport Express connection only delivers Apple Music in my iTunes Library to my amplification at 16/44.1, I can not discern any divergence in sound quality from this mean to music in comparison to stereo SACD. In other words it sounds great. And, since it sounds great Apple Music is now my preferred means to music.