What to Pay Attention to When Using Wireless Microphones?

- Sep 11, 2018-

1. Impedance matching

When using a wireless microphone, the output impedance of the wireless microphone is the same as the input impedance of the amplifier. If the mismatch ratio is above 3:1, the transmission effect will be affected. For example, when a 50Ω wireless microphone is connected to an input impedance of 150Ω, although the output can be increased by nearly 7dB, the high and low frequency sounds will be significantly lost.

2. Working distance and near-talk effect

Generally, the working distance between the wireless microphone and the mouth is preferably 750px-1000px. If the distance is too far, the reverberation increases and the noise increases relatively. If the working distance is too close, it will be distorted due to excessive signal, and the low frequency sound will be too heavy to affect the clarity of the language. This is because the directional microphone has a "near-talk effect", that is, the low-frequency sound will be significantly improved when broadcasting at close range. However, sometimes the singer intends to use the "near effect" to make the singing effect more beautiful and beautiful.

3. Angle between the sound source and the wireless microphone

Each wireless microphone has its effective angle. The general sound source should be aligned with the center line of the wireless microphone. The larger the off angle between the two, the higher the treble loss is. Sometimes when using a wireless microphone, it has a "long" sound, and when it is deflected by some angle, it can be lightened.

4. Position and height wireless microphone

When amplifying, the wireless microphone should not be placed close to the speaker or aligned with the speaker, otherwise it will cause howling.

The height of the wireless microphone should be determined according to the height of the sound source. If it is a person speaking or a few people singing, the height of the wireless microphone should be consistent with the mouth of the singer; when there are a large number of people, the wireless microphone should be placed at an average height, and appropriate Match the singer and accompaniment and the position of the various instruments in the team. Don't make the sound loud, light and light, and make all the sounds within the effective angle of the wireless microphone.



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