How to tweak audio and video settings on Apple TVGet your audio and video playback just the way you like it with a few manual tweaks in the Settings app.
One of the major conveniences of Apple TV is that it handles most of the setup work for you: It automatically detects audio and video hardware, and adjusts those settings accordingly. If, however, things don't quite look or sound right, you can manually make minor adjustments yourself. Here's how.
How to change the speaker output on Apple TV
How to change the surround sound on Apple TV
How to enable 16-bit audio output on Apple TV
How to change the HDMI output on Apple TV
How to change the resolution on Apple TV
How to change the speaker output on Apple TV
You can either use the default audio connection to your TV, piggyback audio from a third-generation Apple TV or AirPort, or hook up a home entertainment sound system.
Open the Settings app.
Select Audio and Video.
Select Audio Output.
Select your preferred speaker output.
How to change the surround sound on Apple TV
...
Source:
How to tweak audio and video settings on Apple TV
