What does a mix-minus audio feed help prevent during calls?

A mix-minus audio feed is designed to prevent feedback from the caller during calls. In a typical audio setup, if the audio being sent to the caller is also mixed into their own audio feed, it can create a loop where they hear a delayed version of their own voice. This causes confusion and can lead to feedback issues, which can disrupt communication.

With a mix-minus configuration, the audio feed sent to the caller does not include their own voice or any other audio that they are already hearing in their ear. This setup eliminates the possibility of acoustic feedback since the caller hears only the audio intended for them, ensuring a clearer and more professional conversation. This is particularly important in radio, television, and other live broadcasting situations, where sound quality is critical to the listener's experience.