In a Tuesday update, Google's YouTube TV app has added 5.1 audio to not just the Apple TV, but also Fire TV hardware.
Apple's 2021 Apple TV 4K with new Siri Remote
The video streaming service announced the upgrade simply, in a Tweet. The 5.1 support extends to "compatible YouTube TV content," adding that is is on live, DVR, and video on-demand content.
Many smart televisions, including Vizio, LG, and Samsung screens have had the capability since launch. Streaming hardware like Google TV, and Android TV hardware was added in June 2022.
5.1 Audio Update! We now support 5.1 audio on Apple TV & Fire TV devices for compatible YouTube TV content (live, DVR, & video on-demand).
— YouTube TV (@YouTubeTV) September 6, 2022
If you're a game console user, we're working on getting this available to you as soon as possible, and will share live updates here. pic.twitter.com/8Pmxrt1WqU
Of course, the content must be mixed for 5.1 audio. A compatible stereo system must be connected as well.
The frequently asked questions for the platform has not as of yet been updated to reflect the new support.