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Concepts and skills of the correct use of microphones

2021-03-08 65
Whether you are the preacher on the podium or the tuner behind the scenes, a little understanding of the concepts and techniques of the correct use of microphones will make your career smoother!

Only three simple concepts
1. Close the distance between the microphone and the mouth
If the microphone is far away from the mouth, the output volume will be greatly reduced. If the volume of the amplifier is turned up, it is easy to produce feedback sound, which is a common problem encountered by general microphone users.
If you want to increase the microphone volume without generating feedback sound, the easiest way is to use the principle of "the volume of the microphone is inversely proportional to the square of the distance from the sound source" and shorten the distance between the microphone and the mouth, and the microphone sound can be reduced. Greatly improved.
But how to fix the microphone near the mouth?

There are many designs on the market, and the "head-mounted microphone" design is one of the solutions. By hanging on the head, the microphone capsule can be adjusted to the position closest to the mouth, so that the microphone can obtain the highest sensitivity and maximum volume output without generating feedback sound.

In addition... If you feel that the low frequency is insufficient when you use the microphone... You can also use the proximity effect of the sound head (Proximity effect)! You can also get the increased low frequency by bringing your mouth closer to the microphone!


Concepts and skills of the correct use of microphones


2. Improve the sound effect of the microphone and reduce unnecessary noise
With a sensitive microphone, the mouth is close enough to the microphone...but the sound starts to become noisy...what's the matter? Because our mouths are speaking, some sounds like "B, F, P..." or "B, F, P..." or Chinese characters such as "ㄆ, ㄈ, ㄊ, ㄏ..." will emit a strong "air flow" from the mouth that impacts the microphone's diaphragm, causing the microphone to produce overload distortion, causing the speaker to output a strong "air burst" Pop Noise” (Pop Noise) seriously damages the normal sound quality. This phenomenon is most obvious when the microphone is used in front of the mouth or near the chin, and the closer the microphone is to the mouth, the more serious the air burst noise.
Therefore, if the microphone you are using has this problem. It is recommended that you adjust the microphone capsule to the position "close to the left and right sides of the mouth, avoiding the air burst noise" to obtain the expected volume and normal sound quality.

After actual testing, "Keep the front of the microphone capsule about one finger away from the corner of the mouth, and maintain a horizontal direction of about 45 degrees with the corner of the mouth." Generally speaking, it is the most ideal position, which can avoid the destruction of air burst sound, and can show the best sensitivity and sound quality. If the position of the sound head exceeds the front of the corner of the mouth, the greater the impact of the air burst sound will be, although the use of sponge A windshield like this can slightly reduce the impact of air burst noise and wind noise, but it will also damage the look of the face and attenuate the high-frequency response of the microphone.

3. Correct tuning concept...Stop blowing on the microphone!
First, make sure that the microphone is turned on... Is the test volume and sound quality what you want? If you feel that it is not good enough, then adjust the position and direction of the sound head. First adjust the length of the microphone holder so that the position of the microphone head at the end of the sound head rod is not too far away from the mouth, and then use the movable joint of the sound head rod holder to adjust the horizontal height of the microphone head approximately below the corner of the mouth.
When adjusting the position of the sound head, it is best to use the live sound reinforcement system to test the sound while adjusting it. Please pronounce it in Chinese: "rich! rich! …", or English pronunciation: "PUSH! PULL! ...", carefully fine-tune the position and direction of the capsule at the corner of your mouth until you get the most satisfactory sensitivity and the best sound effect without popping.
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