I have been reading the posts concerning this subject, but I am still confused and I am hoping for some help. I have a Sonos Arc with sub and Era 300s for surround in my theater room. I also have both a new tv and new projector that both support eARC. I would like to connect both to the Sonos Arc, but for the life of me I cannot understand which switcher I need. Do I need and HDMI extractor? I just want to get the complete sound (including Atmos) from both devices to the Arc. Thank you in advance for the help.