By default, Mac OS X will play through the default speakers even after a USB headset is connected. This is corrected by making the USB headset the default audio device. This only needs to be performed once on a machine – after this the headset will work as expected.
- In the top left corner of the screen, click on the Apple logo. Select “System Preferences”.
- In the new menu, select “Sound”.
- Go to both “Output” and “Input”, and select your headset in both menus. If the change does not take place automatically, close the menu (by pressing the red button in the top left corner of the window), and reconnect the headset.