With the popularity and widespread use of wireless microphones, how can they better play their superior role, the following issues should be paid attention to in the operation and use:
1. How to buy battery for wireless microphone transmitter
In order to ensure that the signal distortion and frequency interference will not occur during the normal use of the system, a sufficient battery must be used. It is best to use an alkaline 9V battery if the conditions are available during the purchase.
2. How can we know as soon as possible whether the transmitter battery energy is sufficient
In various brands and models of wireless microphone systems, most receivers do not have the transmitter battery energy display function. Although some wireless transmitters have low battery indications, users generally seldom pay attention to this problem during use. In the normal use of wireless microphones, audio signal distortion or frequency interference occurs from time to time due to insufficient battery. In order to prevent this phenomenon, the operator can use the PFL pre-listening function of the mixer in a timely manner during the normal use of the wireless microphone, and use headphones to monitor the signal of the wireless microphone. If the sound clarity is slightly reduced or the noise is slightly increased , The battery should be replaced immediately, so as to avoid the psychological pressure of the operator due to insufficient battery energy as much as possible.
3. How to change the battery in the middle of the show
It should be convenient, quick and simple to change the battery during the performance. The best way 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, first turn off the output volume of the wireless microphone receiver, and then turn off the transmitter. After replacing the battery, turn on the power of the transmitter, and then restore the output volume of the receiver to its original gain. If the receiver does not have an output volume switch, you can turn off the mixer input gain or use the Line/MIC selector to switch. After replacing the battery, power on and then reset the mixer input gain or selector.
Why not change the battery after turning off the fader of the wireless microphone channel? It should be noted here that it is more cumbersome to replace the battery by turning off the channel fader. Generally, the microphone has effect processing sound during singing. If one microphone is used, the battery of the other wireless microphone needs to be replaced. At this time, if you turn off the Channel faders, the auxiliary channel potentiometers for reverberation and delay should also be turned off accordingly. If you forget to turn off the auxiliary channel potentiometers, the power impact sound of the shape wireless microphone transmitter will pass through the auxiliary channel when the battery is replaced. If the auxiliary potentiometer is leaked after the battery is replaced, there will be no effect sound, which will affect the sound effect. I would like to remind everyone to pay great attention to the fact that you must develop the habit of removing the transmitter power after each performance (especially using non-alkaline batteries), otherwise you may forget to turn off the transmitter because you have not removed the battery. The shape of the power supply causes the battery energy to run out, causing battery leakage and damaging the transmitter system, causing unnecessary losses.
Fourth, how can we prevent and avoid external interference to wireless microphones
Before purchasing a non-inverter microphone, you should clarify the transmission frequency of the local TV station. When purchasing, you should stagger the transmission frequency of the TV station to avoid interference. When purchasing multiple wireless microphone systems, you should also pay attention that the frequency of each system cannot be repeated. To avoid mutual interference when the frequency overlaps.
5. How to eliminate the interference of the wireless microphone from the outside world
When the non-frequency conversion diversity wireless microphone system is interfered by the outside (referring to when the transmitter power is turned off, the receiver display still has RF radio frequency, AF audio or DIVERSITY diversity connected to either or both of the LED displays of A and B. If the signal is displayed, it indicates that the receiver is in external radio wave interference). The SQUEICH noise suppressor can be adjusted to improve reception and reduce interference. The specific method is to adjust the antenna position, the transmitter is still in the off state, the receiver volume output gain is turned off, and finally the SQUEICH noise suppressor is adjusted clockwise until all the interference signals disappear (the receiver except the power display at this time There is no signal displayed outside), turn it clockwise a little bit, and be sure to use a non-inductive screwdriver when debugging.
Sixth, how to use the antenna correctly to ensure the signal stability
When using multiple sets of wireless microphone systems, if it is the same series of products, it is best to use an antenna splitter if possible to minimize the mutual interference between the antennas. If there is no antenna splitter, the wireless microphone should be received first The antenna of the receiver is adjusted to the best position, and then placed in parallel, keeping a proper distance between each wireless microphone receiver (the antennas on each receiver cannot touch each other), so that each receiver has a better In order to improve the directivity of the wireless receiver, avoid mutual interference between frequencies to obtain a better wireless signal. In addition, it is best to install an extended antenna or an active amplification antenna for large-scale performances to improve the receiving effect.
7. How to correctly identify the wireless microphone in use
When two or more handheld wireless microphones of the same model are used at the same time in a performance, each wireless microphone should be marked with a different color in order to prevent misoperation, and the mark should generally be affixed to the bottom of the handheld wireless microphone. It is not easy to hold the microphone. Where it is blocked, the channel corresponding to the microphone on the mixer should also be marked or marked with the same color as the microphone. In this way, even if an actor takes the wireless microphone by mistake, the operator can correct it in time when the host introduces the actor or when he plays (plays) the song. In addition, you can also use the color microphone dust cover to mark, which can not only eliminate the "puff" and "puff" sounds, but also mark the microphone, which is really two birds with one stone. Especially when singing duets or repetitions, it is more important to adjust the volume and tone of each microphone in time according to the color code.
For bodypack wireless microphones, in order to prevent wrong picking, you can first set the number or color of each microphone transmitter, and set the person and set before the performance. If there are several programs that need to be used alternately, just in case, you can After each alternation, a dedicated person will perform the registration of man and machine, and inform the operator of the registration to avoid operational errors.
8. How to prevent the silent phenomenon that may appear in the performance
In performances, singers always use handheld wireless microphones alternately. After some actors use them, they may unconsciously turn off the power of the wireless transmitter or turn on the mute switch of the microphone, so that the microphone is in a mute state. The transmitter power switch and microphone mute switch are installed in positions that are easy to touch with fingers, so that when an actor uses the wireless microphone, there will be an embarrassing scene of no sound from the wireless microphone, which not only affects the actor’s performance mood, but also affects The audience’s interest in watching may also catch the operator by surprise. This must be taken seriously. In fact, when the power of the wireless microphone transmitter is turned off, the DIVERSITY transmitter working display LED on the wireless microphone receiver will go out. When personnel use the wireless microphone, they can often check the working status of the wireless receiver during the program change. However, if the mute switch of the wireless microphone is turned on, most wireless microphone receivers cannot Displayed. Unless the operator uses headphones to monitor when the program alternates (generally not realistic).
In order to prevent the wireless microphone from being silent, the operator should fix the power switch of the wireless microphone transmitter and the microphone mute switch, which are more exposed, with tape before the performance. It should be used at all times, so that the wireless transmitter and microphone are always in working condition to ensure the normal performance of the performance.
Nine, how to operate the waistband wireless microphone
Waist-mounted wireless microphones generally use miniature electret condenser microphones. This type of microphone is highly sensitive and omnidirectional, and it is easy to produce acoustic feedback during use, especially when using return speakers on the stage. For this reason, this type of microphone When used for opera and sketch performances, if the stage is on the floor and there is a cavity under the floor, in order to prevent low-frequency resonance, the bass gain of the channel on the mixer should be properly attenuated, and the signal of the system should be returned to the listener. The output gain is also attenuated as necessary. Generally, the attenuation amplitude is above 6dB. In case of passionate skit performances, the signal output of the back-to-listening system can also be cut off to avoid acoustic feedback.
10. How to use the radio acoustic instrument system correctly
The radio acoustic instrument system is mainly suitable for sound sources such as electric guitars, electric doubles, electronic organs, synthesizers, and computer drums. The main difference from the wireless microphone system is the way of sound pickup. The microphone pickup is a low impedance output while the electroacoustic instrument’s pickup is a high impedance output (the microphone is 0DB output, and the electroacoustic instrument is -20DB output), so when using an electroacoustic instrument, you should set the LINE/MIC on the wireless transmitter The (line/microphone) switch is set at the LINE (line) position; at the same time, the gain of the transmitter is adjusted appropriately to adjust and control the level of distortion. The wireless microphone receiver should also set the LINE/MIC (line/microphone) switch to the LINE (line) position. In this way, not only the impedance matching between the electro-acoustic musical instrument and each device is achieved, and the level is matched properly, but also the performance of the electro-acoustic musical instrument can be optimally displayed. If the LINE/MIC (line/microphone) switch is set to the MIC/microphone position, it will cause distortion when connected to the MIC/microphone jack of the mixer. In severe cases, it will damage the equipment.
11. How to make the wireless microphone play the best effect
In order to make the wireless microphone play the best effect, the relationship between the transmitter output level gain, the receiver output gain and the mixer input gain must be handled properly. If not handled properly, the sound may be suppressed and lack penetration. Or the sound is distorted or even excessive.
The correct operation method is to turn on the wireless microphone to receive the power of the receiver and the audio system, and set the audio system level (0DB or +4DB), turn on the power amplifier to the maximum output, and set the main output volume of the mixer at the same time. At 0DB, turn on the power of the wireless microphone transmitter, then set the audio output gain of the wireless microphone transmitter at 70% to 75%, and set the channel potentiometer of the wireless microphone input channel on the mixer at 0DB; Finally, carefully adjust the input gain of the mixer, and if necessary, adjust the audio output gain of the transmitter in small increments until the microphone effect is satisfactory.