How Do I Prevent Microphone Feedback

Microphones produce feedback when they’re connected to a speaker and capture the noise of the output, which can create a high-pitched ringing noise. While you can’t completely prevent microphone feedback, there are ways that you can reduce the chances of it happening.

Since echoed sound is the most prominent cause of feedback, try to limit how much noise enters the microphone. You can also make adjustments on your equalizer so the frequencies aren’t as prominent. With the right microphones and settings, your audio should sound clear!

Table of Contents

Audio Solutions Question of the Week: How Do I Prevent Microphone Feedback?

  • Keep the microphone behind the most loudspeakers to attenuate the sound which will reenter the microphone. If the microphone is ahead of the speakers, then feedback is almost guaranteed. you’ll notice this when a performer or presenter steps out into the crowd and finds themselves ahead of the speakers. More often than not the result’s that loud, ugly, screeching sound.
  • Use a microphone with a unidirectional (cardioid) polar pattern. A cardioid microphone has its maximum sound rejection at the rear of the mic. Keep monitors or loudspeakers aimed toward this area of maximum rejection. Please note that an omnidirectional microphone picks up sound equally all round the microphone and has no area of sound rejection. it’s much harder to stay sound from reentering an omnidirectional microphone.
  • Place the microphone on the brink of the sound source. once you reduce the space between the sound source and therefore the microphone by half, you double the sound pressure level at the microphone. this is often an application of the inverse square law. It increases your gain before feedback (i.e., it allows your audio system to supply more SPL before reaching A level that might induce feedback). In other, simpler words, if you progress the microphone closer to the sound source (your mouth, for example) the sound are going to be louder, so you’ll turn down the quantity at your mixer. this may greatly reduce the likelihood of feedback.
  • Feedback will occur at different frequencies at different volumes. Use an equalizer or the EQ section of your mixer to seek out the offending frequency and crop that frequency. There are commercially available feedback eliminators that automatically dampen the frequencies where feedback is happening . you’ve got to take care when using these because sometimes they will go too far and notch out frequencies too deeply and cause you to sound a touch hollow.

What causes microphone feedback?

Even the foremost basic public address system features a microphone, an amplifier and speakers. Whenever these three components are connected there’s a chance for feedback. Feedback happens when the sound from the speakers makes it back to the microphone, is reamplified and sent back through the speakers.
A feedback loop is then created, which comes complete with its own frequency and howling sound. Placing a microphone too distant from a sound source, too on the brink of a speaker, tapping a microphone or turning the quantity up too high are the foremost common ways to make microphone feedback.

Automatic feedback

Reducers are very helpful in wireless microphone applications. Remember that microphone placement is crucial to eliminating feedback, and therefore the temptation to stray from the perfect microphone position when employing a wireless is great. If the performer gets too on the brink of a loudspeaker, feedback will result; an honest feedback reducer are going to be ready to catch and eliminate the feedback faster than a sound engineer.

What is acoustic feedback?

Acoustic feedback occurs when the amplified sound from any loudspeaker re-enters the audio system through any open microphone and is amplified again and again and again. We’ve all heard it – it’s that sustained, ringing tone, varying from a coffee rumble to a piercing screech.

What causes it

The simplest public address system consists of a microphone, an amplifier and one or more speakers. Whenever you’ve got those three components, you’ve got the potential for feedback. Feedback happens when the sound from the speakers makes it back to the microphone and is re-amplified and sent through the speakers again, like this:

Final tip

Always remember your ears are the best detectors of sound. Learn to identify the frequency level by listening to the quality of sound carefully. Tell someone to dial a tone and identify the tone blindly. It’s all about practice. The more you practice, the more efficient you will become.

Apart from following the above tips, you can also check pictures on the internet to get a better idea.

How Do I Prevent Microphone Feedback

Leave a Reply

Scroll to top