Let's assume the Roku Streambar is my only source for my TV. I connect via a non-ARC HDMI port. For streaming content coming from the Roku, do I need a return path for the audio? If so, why? Couldn't the Roku just play the audio itself and send the video on to the TV via HDMI?
Part of this is just my curiosity, and part of it is practical. The practical part is that I have a TV with ARC supported on one HDMI port, but a higher refresh rate (no ARC) on another HDMI part.