I just recently started using Apple TV 4K with Plex and encountered a strange behavior when listening to music. I have my ATV connected to a receiver and when I try to listen to music, subwoofer stops working. It doesn't happen when watching movies - my entire 5.1 setup works fine. There is no setting in Plex that would impact the audio in this way. Also, as far as I know ATV doesn't do bitstream - it sends PCM stream (at least from Infuse) to receiver. Has anyone experienced anything similar to this?