How to Fix Microphone Feedback
Microphone feedback is that dreadful howl or squeal you sometimes experience eminating from loudspeakers during a live performance, speech or presentation.
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The HowToAV team looks at techniques and technologies to avoid feedback and ensure an interference-free performance.
Microphone feedback - also sometimes referred to as the 'Larson effect' can be both annoying to the audience and performer, as well as damaging to a sound system and your ears!
The effect occurs when sound from loudspeakers is picked up by the microphone, re-amplified and then picked-up again from the speakers. This continuous loop results in the howl or rumble of the feedback effect.
A number of options should be considered to eliminate feedback including:
Avoid placing microphones near to the loudspeakers
Place microphone as close to the sound source as possible, rather than increasing the volume of the microphone
Use directional microphones, such as cardioid or supercardioid
Reduce the number of open microphones on a speech system
Use graphic equalisers or parametric equalisers to ring out the frequencies where feedback occurs
Add a feedback eliminating device to your audio system to cut the exact frequency causing the feedback
Avoid hard / reflective surfaces in the environment
Advise the presenter or performer where to stand (and where not to stand) on stage or in the room to avoid proximity to loudspeakers
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