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Microphone feedback is that dreadful howl or squeal you sometimes experience eminating from loudspeakers during a live performance, speech or presentation.
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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