Selecting the microphone should be based on the occasions used and the requirements for sound quality, combined with the characteristics of various microphones. For example, high-quality recording and broadcasting, mainly requires good sound quality, should use condenser microphone, aluminum ribbon microphone or high-quality dynamic microphone; for general amplification, you can use ordinary moving coil type; when the speaker position is not available When moving or speaking, the distance from the amplifier is large. For example, karaoke, you should use a single-directional, low-sensitivity microphone to reduce noise interference. The use of condenser microphones requires phantom power. Generally, the power supply voltage is specified in the technical parameters of the microphone. To select the phantom power of the appropriate voltage, the mixer is usually equipped with 48V phantom power.

 

       Also pay attention to the use:

 

       1, impedance matching

 

3. Working distance and near-talk effect

 

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

 

 4, the angle between the sound source and the microphone

 

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

5, microphone position and height

 

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

 

       The height of the 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 microphone should be consistent with the mouth of the singer; when the number of people is large, the microphone should be placed at the average height and the singer should be properly allocated. And the accompaniment and the position of the various instruments in the team, do not make the sound loud, light and light, and make all the sounds within the effective angle of the microphone. If there is a lead singer or lead, a dedicated microphone should be placed if necessary.

       When several microphones are needed at the same time, the method can be taken and connected, but attention must be paid to the phase problems of several microphones. When the phases are the same, they can be connected in parallel with each other, otherwise they will interfere with each other, so that the output is reduced and distorted. Microphones of different models and different impedances should not be used in parallel because the high-impedance microphone is “short-circuited”, which causes the output voltage to drop to a very low level. Under normal conditions, the microphones are used directly in parallel, which is not as effective as a single microphone.