- You should change your speakerlayout in the Audio Midi Setup utility. The program is located in /Applications/Utilities.\
Select your audio device in "Properties For:", then click the "Configure Speakers" button. Choose "Multichannel". Even if these settings are correct, you should change them and click "Apply", then change them back and again click "Apply". This is important, otherwise VLC cannot reliably detect which speakers are connected.\
- You should change your speakerlayout in the Audio Midi Setup utility. The program is located in /Applications/Utilities.\
Select your audio device in "Properties For:", then click the "Configure Speakers" button. Choose "Multichannel". Even if these settings are correct, you should change them and click "Apply", then change them back and again click "Apply". This is important, otherwise VLC cannot reliably detect which speakers are connected.\