The most overlooked microphone use problem

In use should also pay attention to:

1,
When the microphone is used, the output impedance of the microphone is the same as the input impedance of the amplifier, and if the mismatch ratio is above 3:1, the transmission effect will be affected. For example, the 50Ω microphone connected to the input impedance of 150Ω amplifier, although the output can be increased by nearly 7Db, but the high and low frequency sound will be significantly reduced.

2, connecting line

The output voltage of the microphone is very low, in order to avoid losses and interference connection should be as short as possible, high quality microphone should choose a twisted pair shielding line, general microphone can adopts a single core metal shielded wire. High impedance microphone transmission line length should not exceed 5 meters, otherwise the treble will be significant loss. Low resistance microphone connection can be extended to 30m– 50m.

3, the working distance and proximity effect: Usually, the distance between the microphone and the mouth in 750px– 1000px is appropriate, if the distance is too far, it echoes the increased noise relative growth; work too close, will be distorted by the strong signal, low frequency sound heavy influence the language definition. This is because there is a &ldquo directional microphone; proximity effect ”, namely close first, low frequency sound will be significantly improved. However, sometimes the singer intends to use “ near effect ” so that the effect of singing more beautiful, beautiful.

4, the sound source and the microphone angle

Each microphone has its effective angle, the general sound source to the center line of the microphone, the greater the deviation between the two, the greater the treble loss. Sometimes when using the microphone, with “ long &rdquo voice, then the melody; the microphone deflection angle, can reduce some.





5, the position of the microphone and the height of

When the sound is extended, the microphone should not be placed near the speaker or aligned with the speaker.

The microphone placed height should be in accordance with the source height and, if a person is speaking or singing a few people, the height of microphone and singer mouth; when a large number of microphones, should choose the average height of placement, and appropriate deployment of instruments and the vocal accompaniment and position on the team, do not over ring ring, the light is too light, and to make all the sound within the microphone effective angle. If there is a lead or, when necessary, should be placed a special microphone.

When you need a few microphones at the same time, you can take the parallel connection, but must pay attention to the problem of a few microphones. Phase can be parallel to each other in parallel, otherwise it will interfere with each other, so that the output is reduced, distortion. Different models and different impedances of the microphone, should not be used in parallel, because the high impedance microphone “ short circuit ” so that the output voltage dropped to very low. Under normal circumstances, the microphone is used in parallel, the effect is not as good as a single microphone.

If at the same time with a few microphones for a person to speak, rather than separate places for different purposes, then the microphone or choose the same model is appropriate. Otherwise, the speaker will change the tone of the speech due to the change of the speaker.

The microphone should be used to prevent knocking or falling. It is not appropriate to use the method of blowing or tapping the microphone, otherwise it is easy to damage the microphone.

Use the microphone or recording voice on the outside, should use the cover, avoid wind records into “ &rdquo pupu sound. Windproof cover can also prevent dust contamination microphone.