1. Keep the microphone away from the speaker
This method is difficult to achieve in the dance hall, because the area of the dance hall is generally small. However, in theaters or large venues, this method can have a certain effect. For example, you can consider hanging the microphone above the band or the stage, so that the microphone can be kept close enough to the sound source, and the microphone can be as close as possible. The speakers are far away.
2. Using the directivity of the speaker and microphone
Using the pointing characteristics of the speakers and microphones to suppress the whistling whistle often also plays an irregular role. If the position of the microphone is not in the radiation area of the sound of the speaker, the sound of the speaker is not easily transmitted to the microphone; on the one hand, don't let the speaker face the speaker when using the directional transmitter, try to avoid whistling. In practical applications, the angle of the speaker can be appropriately adjusted so that the sound radiation area of the speaker is not sung in the sound emitting area of the speaker as much as possible, and the microphone is not facing the speaker.
3. Appropriately reduce the volume of the microphone channel
This will limit the singing or band pickup, and the performance will be affected, but sometimes the sound engineer has to take this down-cut strategy. If the volume is controlled in real time according to the performance, when there is ringing, the tuner should pull the volume down in time to avoid howling. When the actor holds or wears the microphone through the front of the speaker, also pay attention to control the volume, otherwise it will cause howling.
4. Volume compensation
If the mixer's parametric equalizer has Q-value adjustment, the volume compensation can be taken to compensate the sound of the path by adjusting the frequency band of the equalizer to the frequency range of the sound of the microphone's sound source, and boosting the frequency band, stop immediately before the howling.
5. Do a good job in the acoustic design of the room building
Acoustic staining in the room is the most important acoustic cause of the whistling. As mentioned earlier, it is inevitable to produce acoustic resonances in a room as a cavity, and resonance will enhance certain frequencies in the sound, and it is a matter of course to make a whistling at this frequency. The main way to eliminate the sound staining of the article is to minimize the occurrence of normal resonance.
The presence of concave reflection in the room will cause the sound focus phenomenon to occur, and the sound focus will cause the volume of the sound field to be too strong. When the microphone picks up the sound in the sound focus area, it is very likely to whistle due to the large amount of feedback of the sound energy. When doing indoor structural design, various measures should be taken to avoid concave reflections.
When selecting interior decoration materials and solutions, the problem of uniform absorption (reflection) of each frequency at the sound absorption material and sound absorption structure should be fully considered to reduce the inconsistency of sound reflection or absorption at different frequencies, which is not only for the frequency of the room. Improvements in the characteristics of the ring are beneficial, and the acoustic dyeing phenomenon can be further eliminated.
6. Reasonable choice of speakers
The directional characteristics and frequency response characteristics of the speaker play an important role in the whistle. The indicator will determine the severity of the whistle when the speaker is in use. The speaker is properly selected and the possibility of whistling is greatly reduced.
The directivity of the speaker is the ability of the speaker to radiate sound in all directions. The speaker with a large angle is easy to send directly to the microphone, and the possibility of whistling is increased. The speaker with a small angle reduces the sound of the speaker directly. The possibility of giving a microphone, the whistling is not easy to happen. Therefore, under the premise of satisfying the sound coverage of the listening area, it is more advantageous to select a speaker with a small pointing angle to reduce the whistling.
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