How to change the sound output setting on Mac? You can play sounds through the built-in speakers of your computer or the speakers of the monitor (if you have speakers), or through speakers, headphones, or other devices that are plugged into a Mac or used wirelessly through AirPlay.
On Mac, choose Apple menu 
> System Preferences
Click "Sound", and then click "Output."
In the sound output device list, select the device you want to use. All sound output devices available for Mac are listed, including the computer's built-in speakers, devices plugged into the computer's sound port ( 
), USB speakers, and "air play" devices.
For any device plugged into the sound port of your computer, choose "Headphones."
Do any of the following to adjust the sound output settings:
- Adjust balance: Drag the "Balance" slider.
- Adjust the volume: Drag the "Output" volume slider.
- Stop sound output: select the "Mute" check box.
- Show volume control in the menu bar: Select the "Show volume in the menu bar" checkbox, so you can turn up or down the volume anywhere.
To set a separate volume for the alert sound, click "Sound Effects."
Depending on the Mac and device you are using, you may be able to use the "Audio MIDI Setup" app to set other volume options.
If you are using an App with a volume control (such as "Music" or iMovie), its setting can only be equal to or lower than the computer's output volume. These controls will not override the settings you choose in Sound preferences.
The above is what Xiaobian brings to you to change the sound output settings on the Mac. I hope it will be helpful to you. If you want to know more about Mac-related content, please follow macz.com!