YouTube TV, the paid streaming TV service, has announced that 5.1 surround sound audio is finally supported on more devices, via The Verge. Smart TVs from Samsung, LG, and Vizio, as well as the traditional remote-less Chromecast have supported 5.1 audio for a while but now Google is adding support for Google TV devices, like the 2020 Chromecast with Google TV, Android TV devices, like the Nvidia Shield TV, and select Roku devices. Devices that don’t yet include 5.1 audio support are all Fire TVs, Apple TVs, PlayStation, and Xbox. Google says that it is “still working internally and with partners” to add 5.1 audio support to more devices, so there’s still hope for it coming to more devices.
6/23/22 Amazon has stated that YouTube TV 5.1 surround sound is now supported on the Fire TV Stick 4K Max, Fire TV Stick, and Fire TV Stick Lite.