Feedback prevention
- Thread starterDillweed
- Start date
damjamkato
Member
What sort of microphones were you using on the show choir, and what was their physical relationship to the PA? It'll be difficult to recommend an appropriate solution without more detail.
Thetechmanmac
Active Member
Every sound system has a limit to how much amplification you can get before feedback happens. It's called Gain Before Feedback (GBF). People's expectations usually exceed the laws of physics. A few of the variables involved are:
1. The type and placement of mics
2. The strength of the sound sources
3. The number of open mics
4. The directivity of the speakers
5. The placement of the speakers in relation to the mics
6. The distance between mics and speakers
7. The frequency response of the speakers
8. The acoustics of the room
Without knowing quite a bit of detail about your setup, it's hard to suggest how to make some improvements. In general, you want to keep as little sound as possible from the speakers reaching the mics. You also want maximum distance from speaker to mic.
Often times, we have the most control over mic placement. Putting the mics closer to the sources is a painless way to get more gain before feedback. Halving the distance increases the level by 6 dB, which is huge. I also wonder if you may be using too many mics on the choir. Doubling the number of mics reduces GBF by 3 dB. Heed the 3 to 1 rule of mic placement. The high-pass filter is your friend.
1. The type and placement of mics
2. The strength of the sound sources
3. The number of open mics
4. The directivity of the speakers
5. The placement of the speakers in relation to the mics
6. The distance between mics and speakers
7. The frequency response of the speakers
8. The acoustics of the room
Without knowing quite a bit of detail about your setup, it's hard to suggest how to make some improvements. In general, you want to keep as little sound as possible from the speakers reaching the mics. You also want maximum distance from speaker to mic.
Often times, we have the most control over mic placement. Putting the mics closer to the sources is a painless way to get more gain before feedback. Halving the distance increases the level by 6 dB, which is huge. I also wonder if you may be using too many mics on the choir. Doubling the number of mics reduces GBF by 3 dB. Heed the 3 to 1 rule of mic placement. The high-pass filter is your friend.
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