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Feedback How to Eliminate Feedback Audio feedback is the ringing noise often described as squealing, screeching, etc sometimes present in sound systems.

May 07, 2013

It is caused by a "looped signal", that is, a signal which travels in a continuous loop. In technical terms, feedback occurs when the gain in the signal loop reaches "unity" 0dB gain. One of the most common feedback situations is shown in the diagram below - a microphone feeds a signal into a sound system, which then amplifies and outputs the signal from a speaker, which is picked up again by the microphone.

Of course, there are many situations which result in feedback. For example, the microphone could be replaced by the pickups of an electric guitar. In fact many guitarists employ controlled feedback to artistic advantage.

To eliminate feedback, you must interrupt the feedback loop.

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Here are a few suggestions for controlling feedback: Keep speakers further forward i. Use a more directional microphone. Speak or sing close to the microphone. Turn the microphone off when not in use. Equalise the signal, lowering the frequencies which are causing the feedback. Use a noise gate automatically shuts off a signal when it gets below a certain threshold or filter.

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Lower the speaker output, so the mic doesn't pick it up. Avoid aiming speakers directly at reflective surfaces such as walls. Use direct injection feeds instead of microphones for musical instruments. Use headset or in-ear monitors instead of speaker monitors. You could also try a digital feedback eliminator.

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There are various models available with varying levels of effectiveness. The better ones are reported to produce reasonable results. Feedback can occur at any frequency. The frequencies which cause most trouble will depend on the situation but factors include the room's resonant frequencies, frequency response of microphones, characteristics of musical instruments e.

Feedback can be "almost there", or intermittent.

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For example, you might turn down the level of a microphone to stop the continuous feedback, but when someone talks into it you might still notice a faint ringing or unpleasant tone to the voice. In this case, the feedback is still a problem and further action must be taken.k Followers, 3, Following, Posts - See Instagram photos and videos from Pro-Ject Audio Systems (@projectaudiosystems).

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