How can you identify the source of feedback in live audio?

1 Know the frequency

Feedback occurs when a specific frequency or range of frequencies is amplified too much, creating a loop between the microphone and the speaker. The frequency of feedback depends on various factors, such as the distance, angle, and orientation of the microphone and speaker, the acoustics of the room, and the equalization of the sound system. To identify the frequency of feedback, you can use a spectrum analyzer, a device or software that shows the level of different frequencies in the audio signal. Alternatively, you can use your ear to recognize the pitch of the feedback and compare it to a musical note or a tuning app.

4 Use filters and processors

Another way to reduce feedback is to use filters and processors, which are devices or software that modify the audio signal in different ways. Filters are used to cut or boost certain frequencies, while processors are used to apply effects such as compression, reverb, or delay. Filters and processors can help you eliminate or minimize feedback by removing or reducing the frequencies that cause it, or by enhancing or masking other frequencies. For example, you can use a graphic equalizer, a filter that allows you to adjust the level of multiple frequency bands, to cut the frequency of feedback. You can also use a feedback suppressor, a processor that automatically detects and filters out feedback frequencies.

5 Test and monitor

The final way to reduce feedback is to test and monitor your sound system before and during the live event. Testing and monitoring can help you identify and fix any feedback issues before they become noticeable or disruptive. For example, you can test your sound system by playing some music or speaking into the microphone, and listening for any feedback or distortion. You can also monitor your sound system by using headphones, meters, or indicators, and checking for any abnormal or excessive levels or signals. If you hear or see any feedback, you can use the previous tips to troubleshoot and solve it.