Play the same sound in both of your AirPods
When you use supported AirPods with iPhone, iPad, Mac, or Apple Watch, you can use Mono Audio, rather than stereo sound, to play the same content in both ears.
iPhone or iPad: Go to Settings
> Accessibility > Audio & Visual, then turn on Mono Audio.Apple Watch: Go to Settings
> Accessibility, then turn on Mono Audio below Hearing.Mac: Choose Apple menu
in the sidebar. Click Audio, then turn on “Play stereo audio as mono.”
Note: When you use Mono Audio, you can’t use Spatial Audio and head tracking.