Tips for using wireless microphones

Do not use it on the net head of the wireless microphone:

Many performers use the method of holding the microphone mesh head with their palms, which is a bad posture that seriously damages the sound quality and directivity of the microphone. Using the microphone in such a posture, even if the expensive microphone is selected, it will still have the characteristics of the original manufacturer. Loss of tone sandhi! The result of holding the mesh head with the palm is equal to isolating the sound circuit around the capsule air chamber or changing the resonance frequency of the air chamber, which will cause serious degradation of the microphone's front frequency response characteristics and the separation of the pointing characteristics, and the focus of the palm The effect causes a certain frequency of resonance and enhances the generation of feedback sound. Although wireless microphones are easy to use because they are not entangled with the connection, users often do not have to study the correct posture for holding the microphone and grab the net head of the microphone at will. Such a use posture will inevitably lose the original

 superior characteristics of the microphone. If a singer wants to use a microphone to reproduce the beautiful original sound of a singing voice, he must first learn the correct posture to hold the microphone. The posture of holding the microphone is very simple. Just remember one important principle: no matter how you hold it, don’t hold it on the net head of the microphone; the correct posture should be held on the tube of the microphone.

Grasping two wireless microphones in one hand is a serious mistake:

In TV shows, some politicians are often surprised to find that some politicians are holding two or even three wireless microphones in one hand. This is a very wrong way of using. I don’t know if this is the user’s request or the sound engineering company’s "creation". "If it is the former’s instigation, it is excusable. If the latter’s professionals make such an arrangement, three big boards should be flogged!"

This is because when two transmitters with different frequencies are used close together, it will produce harmonic interference with internal modulation distortion. The closer or the more the frequency, the more serious the interference. A system that uses multiple channels at the same time will cause mutual interference and reception. The problem of instability is more serious.

In addition to the problem of high-frequency harmonic interference caused by two or more wireless microphones close together, the more serious is the phenomenon of audio phase and directivity interference of the microphone, which destroys the original normal sound quality of the microphone. When the audio phases of the microphones are the same, the outputs of the two microphones will be added together, which will increase the volume of the amplifier and generate feedback sound; on the contrary, due to the opposite phase, the output of the microphone will be subtracted, resulting in insufficient volume of the amplifier. The directivity of the microphone will also interfere with each other due to the proximity of the two microphones, which will degrade the original excellent directional characteristics. The degradation of these characteristics is proportional to the distance between the two microphones, so users should avoid holding two microphones in one hand. Or use two or more wireless microphones at the same time to avoid deterioration of volume, frequency response and directivity. Maybe some people think that taking a few more can avoid that if one microphone fails during use, the other one can still be used. In fact, to prevent the abnormal use of the wireless microphone, it is not possible to solve it with this "two boats" method. On the contrary, this wrong use method will bring more serious characteristics change problems. It is recommended to use " "Replace" instead of "simultaneous" use can avoid the above-mentioned deficiency. If you must use multiple microphones at the same time, the distance between the multiple microphones should be at least 30 cm apart to reduce the change in microphone characteristics.

Make good use of the distance between the wireless microphone and the mouth:

When using a directional wireless microphone to sing, pay attention to the posture of holding the microphone. Because the distance between the microphone and the mouth, the sensitivity and sound quality will change significantly, especially because the sensitivity of the microphone is inversely proportional to the square of the distance between the mouth, so the sound Performers with insufficient throat strength should not hold the microphone too far away from the mouth and turn on the loudspeaker volume, which will easily cause feedback sound; for loud throat singers, do not need to hold the microphone too close to the mouth, which will easily lead to Produce the excessive saturation distortion of the amplifier.

Furthermore, because the large-aperture directional microphone has obvious proximity effect (Proximityeffect) characteristics, when the microphone is close to the mouth, the bass will increase greatly as the distance decreases. Therefore, if your voice has insufficient bass, you can turn the microphone Move closer to your mouth and use the proximity effect to compensate for your bass effect, making your voice thicker and more magnetic; on the contrary, if your voice is too deep, you can move the microphone away from your mouth to reduce the proximity effect of the microphone and lower the bass The enhancement makes your voice clearer and brighter.

The distance between the microphone and the mouth has a great influence on the storm noise (PoppingNoise), especially the microphone with high sensitivity and strong bass response, the storm noise will be more serious. In order to reduce the lack of this kind of noise, in addition to adjusting the distance of the microphone, when buying a microphone, pay more attention to the model with good characteristics of preventing storm noise. The higher the microphone, the more particular about the elimination of storm noise.

As mentioned above, the different use of microphones with the same characteristics will greatly affect the sound effects used. Therefore, singers who use wireless microphones should not only have a microphone with superior characteristics. The more important principle is to own one. A microphone with familiar characteristics, constant practical experience and practice of the correct posture, and knowing how to make good use of the distance between the microphone and the mouth, adjust the volume and tone that suits your voice, and avoid troublesome storm noises, in order to show the microphone is good The effect of use.

Avoid using the wireless microphone facing the speaker:

Generally, wireless microphones used for singing use directional capsules. Therefore, holding the microphone while standing on both sides or behind the speaker will not produce feedback whistling sound. If you need to stand in front of the speaker, pay attention to the direction of the microphone and the speaker to be controlled at a certain angle, so as not to produce feedback sound.

The position of the wireless microphone is maintained at an angle of more than 90 degrees in the vertical or horizontal direction to reduce the occurrence of feedback sound. The front of the cardioid directional microphone is maintained at 180 degrees with the horn or the front of the super directional microphone is maintained with the horn. The feedback sound between 120 and 140 degrees is small. If you do not understand the directivity of the microphone you use, and use it facing the speaker, it will easily cause loud feedback. Because the microphone and the loudspeaker face each other at a taboo angle, under such an angle, no matter any expensive microphone, it is easy to produce screaming feedback sound.

How to prevent and avoid the interference of external signals on the wireless microphone

Before purchasing a wireless microphone, you should find out the transmitting frequency of the local TV station, and stagger it when purchasing. If it is a newly built site, if conditions permit, add high-density wire mesh or iron sheet to the top and surrounding of the building to shield and isolate the interference of external wireless signals. Or use the SQUEICH knob on the receiver to suppress the interference signal (but this has an impact on the receiving distance of the microphone).

Signal stability

When multiple sets of wireless microphone systems of the same series are used, antenna splitters can be used if possible to minimize the mutual interference between the antennas on the original receiver; or the wireless microphone receivers should be kept at an appropriate horizontal spacing so that each The receivers have better receiving conditions to avoid mutual interference between frequencies to obtain better wireless signals.

wireless microphone

When two or more handheld wireless microphones of the same model are used in a performance at the same time, in order to prevent misoperation, the bottom of each wireless microphone (the place that is not easy to block when holding the microphone) should be marked with a different color, and at the same time on the mixer The corresponding channel of the microphone should also be marked or marked with the same color as the microphone. In this way, even if the wrong wireless microphone is taken, the operator can correct it in time. In addition, you can also use the color microphone dust cover to mark, which not only improves the sound quality, but also serves as a microphone mark, which will do two things with one stone. In order to prevent the wrong lavalier microphone, you can first set the number or color of each microphone transmitter. Before the performance, the person and the machine should be ordered. When the exchange is used, a special person should arrange it.

Silent phenomenon

In performances, singers always use handheld wireless microphones alternately. Some actors unconsciously turn off the power of the wireless transmitter or turn on the mute switch of the microphone to make the microphone mute, so that the next actor uses the wireless microphone Sometimes there will be embarrassing scenes of no sound from the wireless microphone, which will catch the operator by surprise. Under normal circumstances, when the power of the wireless microphone transmitter is turned off, the transmitter working indicator light on the wireless microphone receiver will go out. If the operator can often check the wireless receiver indicator light when switching microphones, the problem will be discovered in time. However, if the mute switch of the wireless microphone is turned on, it is only up to the operator to monitor with headphones when the program is alternated. In order to prevent the wireless microphone from being silent, usually the mute switch should be fixed with tape.

Choose battery

In order to ensure the normal use of the wireless microphone system, use batteries with sufficient energy and use alkaline 9v batteries. At the same time, the battery level should be confirmed before purchase and use.

Is it sufficient

Most V-segment wireless microphone receivers do not have the transmitter battery power display function. In order to prevent the occurrence of audio signal distortion caused by insufficient battery power, the operator can use the mixer PFL pre-listening function during the normal use of the wireless microphone, and monitor the signal of the wireless microphone with headphones. If the signal noise of the microphone channel increases slightly When it is too large, the battery should be replaced immediately.

Replacement battery

The way to replace the battery during the performance is to turn on the "mute" switch of the mixer channel to make the wireless microphone in a mute state. If the mixer does not have this function, the output level of the wireless microphone receiver can be turned off and then off. Turn off the power of the transmitter, replace the battery and turn on the power of the transmitter, and then restore the output level of the receiver; or turn off the mixer input gain or use the Line/MIC selector to switch the input signal, and then turn on the tuning after replacing the battery Input gain or select key to reset.