This section gives you step by step instructions on how to send mono audio to connected speakers or ear-buds in watchOS 9, with pictures of the screens to help.
1. Press the Digital Crown on your Apple Watch. If your apps are displayed as icons, tap the Settings icon . If your apps are displayed in a list, scroll down and tap Settings.
2. On the Settings screen, scroll down and tap Accessibility.
3. On the Accessibility screen, scroll down and tap the toggle switch for Mono Audio to turn it on.
4. When you are happy with your settings, you can return to the clock face by pressing the Digital Crown.