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Home : Avoiding Feedback : Avoiding Feedback, Introduction

Avoiding Feedback, Introduction

Feedback occurs when sound from PA or monitor loudspeakers loops through the system via pickup sources. It is usually heard initially as a slight ringing which soon increases to a loud, annoying howl or squeal. Sometimes though it can have a quick, sudden onset, especially where microphones and reflective surfaces are moved about. In all instances it's annoying and potentially harmful to equipment and hearing. Feedback is definitely something to be avoided.

Like any force in physics, feedback follows the path of least resistance, or more accurately, the course of highest gain. In other words, feedback will occur where gain in the sound loop is greatest.

In avoiding feedback, everything affecting the gain loop must be considered. Involved are pickup characteristics (on-board and microphones), mixer gain, mixer EQ, main equalizer settings, loudspeaker characteristics, the room itself and finally, performers behind the microphone.

When feedback occurs the trick is to identify the most likely cause and how best to correct it. Often a simple reduction in a channel's gain (input gain or fader) is all that is required. However sometimes more gain is needed than what the feedback threshold will allow. This is where it gets complicated. The following pages go into specific detail in the various aspects involved with avoiding feedback.


Avoiding Feedback, Microphones

Avoiding Feedback, Mixer Gain

Avoiding Feedback, Equalization

Avoiding feedback, Loudspeakers

Avoiding Feedback, Rooms




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Home : Avoiding Feedback : Avoiding Feedback, Introduction

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