So I have an Insignia Roku TV and use a sound bar (LG). I use the ARC set up. However, when I go on Netflix through the app on the TV I always have to change to the audio setting from English 5.1 to English. Also when I try to watch any Prime Video through the app on the TV there is absolutely no sound. This does not occur on other apps for example everything works great with PS Vue and Pandora. This does not happen when I use my Fire TV box I can use Netflix and obviously Prime Video no problem.