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Mono Audio and audio balance on Apple Watch
If you prefer to hear a combined left+right audio signal out of both audio channels on speakers or headphones connected to your Apple Watch, turn on Mono Audio. You can also adjust the left-right balance of your Apple Watch audio, whether stereo or mono.
Change audio settings
Open the Apple Watch app on your iPhone, tap My Watch, go to General > Accessibility, then do the following:
Switch from stereo to mono audio: Turn on Mono Audio.
Adjust the audio balance: Drag the slider below Mono Audio.