Microphone Feedback (How to Prevent It)
Microphone feedback is that high pitched and unpleasant sound that can pierce through your speakers when you least expect or want it. It is caused by a signal (at any frequency) which travels in a continuous loop. In a typical feedback situation, a microphone feeds a signal into a sound system, which then amplifies and outputs the signal from a speaker, which is then picked up again by the microphone. Feedback occurs when the gain in the signal loop reaches "unity" (0dB gain). Bottom line: It sucks.
Try these simple fixes for feedback issues:
- MOST POPULAR REASON: If you are using a Wireless mic, ALWAYS put in a fresh battery. This is the #1 cause of feedback among wireless microphones.
- Make sure your mic isn't pointing toward your speakers; change speaker angle
- Keep speakers further forward (i.e. closer to the audience) than microphones
- Avoid aiming speakers directly at reflective surfaces such as walls
- Turn the microphone off when not in use
- Lower the speaker output, so the mic doesn't pick it up
- Turn down the level of a microphone to avoid any slight continuous feedback
- Use headset or in-ear monitors instead of floor monitors or side-fills
- Try a digital feedback eliminator
Originally By Melinda Truslow
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