First, adjust the distance method

Using an omnidirectional microphone, where the microphone is as close as possible to the sound source to pick up the sound, is one of the effective ways not only to avoid noise but also to boost the amplified volume.

It is obvious here that directional microphones (especially pointed directional microphones) have little attenuation for distant sound sources, and adjusting the distance to enhance the amplification volume and prevent howling has little effect.

Whether the PA system is easy to whistle or not has no direct relationship with the sensitivity of the microphone. It's just that the high-sensitivity mic is spiky and prone to squealing. Shortening the distance between the device and the audience can actually increase the loudness of the amplification. The overall gain of the system can be appropriately reduced. If supplemented by a wide-directional near-field loudspeaker, the microphone can be avoided slightly away from the whistle. Conference room wall mounted audio

For the direct feedback sound field of the speaker, the microphone is as far away from the speaker as possible, and the speaker is as close to the listener as possible. The microphone should be placed on the back of the speaker in the radiation direction, and if the microphone may be carried around, the speaker should be placed where the microphone is not close to the speaker.

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