[solved]How to use USB speaker on a macbook / mac doesn't use external USB speaker

Take D501 as an example


1. Connect the external speaker to Mac
2. If there is a switch, switch the speaker to mp3 mode
3. On the Macbook, click the gear icon (System Preferences) , then Sound
4. Output tab -> Select USB rather than Built-in
5. Make sure the "Mute" box is unchecked