Also pay attention to the use:
1, impedance matching
When using a microphone, the output impedance of the 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 microphone is connected to an input impedance of 150Ω, the output can be increased by nearly 7Db, but the high and low frequencies will be significantly lost.
2, the connection line
The output voltage of the microphone is very low. In order to avoid loss and interference, the connection line must be as short as possible. The high-quality microphone should be a double-core stranded metal shielded wire. Generally, the microphone can be a single-core metal shielded wire. The length of the high-impedance microphone transmission line should not exceed 5 meters, otherwise the high-pitched sound will be significantly lost. The connection of the low-impedance microphone can be extended to 30m–50m.
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-speaking effect", that is, the low-frequency sound is significantly improved when broadcasting at a close distance. 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 consistent, 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-circuitedâ€, which causes the output voltage to drop to a very low level. Under normal circumstances, the microphones are used directly in parallel, which is not as effective as a single microphone.
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