FAQ about Microphone

It's a painful experience to meet a whistle when you're singing. You're totally lost in the beautiful music,but then the microphone starts blaring and you lose all your excitement. It can be especially awkward for the singer if someone else is present. Screaming during meetings can also get things out of hand. The cause of the whistle ? ① The microphone is located at the front of the speaker and points to the speaker ② The speaker is too close to the microphone ③ the user put his hand over his microphone to sing ④ Serious sound reflection ⑤ Microphone gain is too high (volume is too high) ⑥ Sound system is not perfect The impact of whistle ? Once the whistle occurs, mild will cause the microphone volume can not be turned up, because after turning up the volume, the whistle will become very serious. Not only cause trouble to the user,the damage to equipment is also significant.Below whistle state, the signal is very strong, can make power amplifier appear clipping wave distortion, and produce a lot of high frequency harmonics. After these high-frequency harmonics are sent to the treble driver of the speaker box, the treble driver cannot withstand such a powerful high-frequency signal, which will cause the voice coil to burn. In addition, in the whistle state, the power amplifier will be overloaded due to the output is too large, and it is also very likely to be burned. How to avoid the whistle of microphone ? 1. Habits of microphone use①Keep the microphone away from the speaker box②Adjust the volume of the microphone appropriately. If the microphone volume is too large, the probability of ringing phenomenon will increase, to reduce the volume in time to avoid the whistle. In addition, if the handheld microphone through the speaker, also want to pay attention to control the volume, otherwise the microphone will be too close to the speaker and cause serious noise.③Rational use of speakers and microphones pointing characteristics. The microphone and the speaker have directivity, if the microphone is not in the use of the speaker sound radiation area, the sound of the speaker is not easy to reach the microphone; Similarly, if the speaker is not in the microphone's pick up area, it is difficult for the microphone to pick up the sound from the speaker. Therefore, by properly adjusting the Angle of the speaker, in the use of the microphone to make it avoid the sound playback area of the speaker, or make the sound radiation area of the speaker does not overlap with the use of the microphone, you can suppress the whistle. 2.Rely on electroacoustic equipment① frequency shifterBy changing the frequency of the sound with a frequency shifter, the whistle can be suppressed by destroying the conditions that produce the whistle. However, the device has certain limitations and is not suitable for singing and Musical Instruments. It can increase the sound signal by 5Hz, which is good for speech amplification, because speech ranges from 130 to 350Hz, and a change of 5Hz does not result in a noticeable increase in pitch. However, the lower limit frequency of vocal music and instrumental music is about 20Hz. When people listen to the tone change of 5Hz, they have a very obvious sense of its change. ②Equalizer and feedback suppressorThe reason for the whistle is that the signal of some frequencies in the system is too strong. Weakening this part of the signal can suppress the whistle. Both equalizer and feedback suppressor can effectively weaken the gain of feedback frequency points to suppress the whistle. 3.The acoustic design of the roomThe sound condition of the room is not good, for example, the acoustic resonance of the room makes certain frequencies in the sound to be strengthened, will lead to the whistle. The sound focusing caused by the concave reflection in the room causes the local volume in the sound field to be too strong. When the microphone picks up the sound in the area where the sound is focused, the noise will also be generated. Interior design, the user can through reasonable sound field layout, increase sound absorbing materials, change sound reflection effects and other physical means to avoid the whistle as far as possible. 4.Reasonable selection of sound system equipment As the saying goes, "a good horse with a good saddle", singing is the same, good sound equipment can for the singer's voice embellishments a lot.

Some friends think that they are all similar when they hear UHF wireless systems, but they don't know that although the same high frequency band, the circuit design of the receiver transmitter is different, and the function is different.Most of the U section uses SMD components, and the performance is very stable compared to VHF and FM.There are generally three circuits in the U segment, and the sound quality is very good, but the suitable scenes are greatly different. SKM9000 True diversity PLL frequency synthesizer wireless UHF Microphone AXT220D True diversity PLL frequency synthesizer wireless UHF Microphone 1st Type: Single Frequency circuit Many people buy a wireless microphone system with a single-frequency circuit, and they think they are fooled. Because the UHF single-frequency circuit is similar to the V-band circuit, high-frequency amplification and intermediate-frequency amplification. Frequency mixing and frequency discrimination. Step-by-step processing, high-amplification divided into several episodes to enlarge, the sound quality is clearer.Suitable for the crowd: does not meet the interference of the V segment, but the requirements for use are not high. 2nd type: Adjustable frequency circuit This type of machine is controlled by a microcomputer program. The high-frequency oscillation is controlled by a phase-locked loop (PLL). There are multiple channels adjustable, and thousands of adjustable frequency points are available for selection. Effectively avoid interference, multiple machines can be used at the same place at the same time without interfering with each other. If there is interference, adjust the frequency point to other frequency points to avoid interference. The squelch control and audio processing are all new designs. , The performance is stable.Use occasions: This type of machine is used in many high-end KTV rooms. Small and medium-sized concerts. Or when multiple people are required to sing at the same time, the effect is ideal. 3rd type: Diversity circuit Diversity is divided into single frequency diversity and adjustable frequency trial diversity. This type of machine has the functions of U-segment machine, and each channel adopts a two-way receiving circuit system. If there is a dead point in the receiving system of one channel, there is another channel that can receive the signal, which effectively avoids the signal dead zone, greatly improves the technical level of the whole machine, and ensures the stability of the received signal and continuous reception. This type of machine is more advanced wireless microphone. The farthest use distance can reach more than 200 meters.Use occasions: various large and medium-sized concerts. The use environment is very demanding and the use environment is more complicated. This type of machine is the best choice. UHF Digital Single Wireless Handheld Microphone System QLXD4 + QLXD2/SM-58/BETA58A QLXD4 delivers clean audio and provides professional features for demanding live sound events and installations. Professional stage system for singers UHF bodypack SR2050 IEM in ear monitor SR2050 wireless in ear-monitor system is used in stage performance and sound broadcast, achieve admirable listening effect. Sinbosen UHF Professional Handheld skm 9000 wireless microphone System SKM 9000 ideal environment for operating radius of 100 meters, used in a variety of high demand occasions AXT220D Dynamic / Condenser Digital wireless Handheld microphone Sinbosen AXT220D true diversity digital wireless microphone. Good performance, Working effective distance 400 meters.

Common problems and solutions in the use of wireless microphones With the development of the times, wireless microphones are favored by more and more people. It is because the wireless microphone is convenient and lightweight to use, many people use it to sing, lecture, hold meetings, live broadcast...However, its performance is often affected by various factors such as the frequency interference of the surrounding equipment, the user's wrong operation and other factors, and various failures occur. Let us take an in-depth interpretation of some common problems and solutions in the use of wireless microphones.1. Can I use two microphones of the same frequency at the same time?Cannot be used at the same time. Wireless transmission cannot be "mixed" in the air, and even at the same frequency, the receiver cannot mix two transmitted signals. For example, it is impossible for two FM radio stations to transmit signals on the same frequency. Because this will cause confusion and cause audio distortion. All in all, each wireless transmitter should have a separate receiver and its unique frequency.2. What is the difference between the frequencies of the wireless microphones to avoid interference?This depends on the situation, but less often requires 4MHz. This question cannot be answered clearly because it involves complex calculations. In general, cheaper wireless systems require a larger frequency gap, because their receivers are simple in design and few choices, which limits the number of compatible channels. The higher the price of the system, the better the filtering, the closer the distance between channels, the more compatible channels.3. What is the reason why the microphone cannot be activated?It should be checked whether the battery power is low or the filling is wrong.4. UHF system is better than VHF system, right?The two frequency bands used for wireless microphones have their own advantages and disadvantages. This is determined by the user of the frequency band, the physical characteristics of the frequency band, and the adjustment limits of the frequency band.UHF (U section) system is superior to VHF (V section) system in several aspects:The UHF band is not "crowded" in the VHF band;UHF with flexible frequency has a wider application range;UHF features can provide more compatible systems;UHF system has higher power output than VHF, wider frequency shift, better dynamic range, and better signal-to-noise ratio than VHF.VHF (V section) system is superior to UHF (U section) system in several aspects:The price of VHF system is cheaper than that of UHF;VHF system has a larger transmitting range under a specified transmitting power;VHF signals are highly propagating, even through non-metallic substances. VHF has a long wavelength and is not easily absorbed by the human body.5. Can UHF system be compatible with VHF system?Yes, even if the number of compatible VHF systems is large, it is also compatible with UHF. (But you cannot connect the UHF receiver to the VHF antenna, VHF splitter, or VHF antenna distribution amplifier).6. What should I do if the signal transmission distance is short and the communication is interrupted?1) Check whether the antenna is installed correctly;2) Check whether the weak battery indicator light is on.7. The receiver and microphone are turned on, but there is no signal reception display. Why?1) The receiver and microphone have different frequency points.At this time, you need to replace either one with the same correct frequency. If it is a PLL model and the frequency range of the two is the same, the frequency may be selected incorrectly. Just change the channel selection to the same correct frequency.2) The microphone is malfunctioning.If the above two frequency points are the same, either the microphone or the receiver may be malfunctioning. You can use another microphone of the same model and frequency point for testing. If the receiver can be activated, the original microphone is malfunctioning; Or test with another receiver of the same model and frequency point. If it can be activated, it means that the original receiver is faulty.

In the field of professional microphones, the microphones used in live performances and recording studios are classified. Generally speaking, dynamic microphones are used in live performances, while condenser microphones are used in quieter environments such as recording studios.Therefore, a customized live performance microphone that costs hundreds of thousands of dollars may not be suitable for the recording studio. The expensive one is not as good as the suitable one. Microphone on stage The microphones on the stage generally use cardioid dynamic microphones, which are not only affordable, but also resistant to damage. As modern stages are getting larger and larger, for convenience, more people will love wireless microphone systems. Wireless microphones are basically The composition includes: antenna system, receiver, transmitter and microphone head. If you are a singer, you will also choose a head-mounted microphone that frees your hands.Of course, if the location of the musician is fixed, a wired microphone is also a very good choice. Microphone in the recording studio At present, many of the microphones used by Internet celebrity anchors are actually condenser microphones, because condenser microphones are characterized by higher sensitivity and can pick up subtle sounds. When you have a quiet environment, condenser microphones can capture the details of the sound.The market price of condenser microphones is much more expensive than dynamic microphones, and it is more delicate: it is not resistant to drops, can not be in a humid environment for a long time, can not be exposed to water, etc., if you have a condenser microphone, then you must give it very carefully Pampering.

Large diaphragm microphone In practice, people often call a microphone with a diaphragm greater than or equal to 3/4 inch as a large diaphragm microphone. Generally speaking, a microphone with a larger diaphragm produces a larger sound, which caters to the needs of engineers who like to record more distinctive sounds (such as human voices).In addition, large-diaphragm microphones are more sensitive to audio signals than small-diaphragm and medium-diaphragm microphones because of their relatively large contact area with audio signals. People generally think that large-diaphragm microphones can capture more low-frequency signals than small-diaphragm microphones. This argument is reasonable, Because compared with some small-diaphragm microphones that are reasonably designed and can provide high-definition sound effects over a wide frequency range, large-diaphragm microphones tend to enhance certain characteristics in the audio signal to make it sound The effect has obvious bass characteristics.In the current market, there are many very high-quality large-diaphragm microphones, such as U87 Ai, MK4 and so on. The large-diaphragm microphone has a clear and thick sound, high sensitivity, and good sound quality. It can cope with most sound sources, but it has strict requirements on the recording environment: Don't fall, don't moisten, don't blow Mid-diaphragm microphone The definition of a mid-diaphragm microphone is also one of the more controversial topics, because in history there are only large-diaphragm microphones and small-diaphragm microphones. At present, the upper and lower limits of its diaphragm diameter have not yet formed a clear conclusion. However, most professionals and manufacturers believe that microphones with a diaphragm diameter between 5/8 inches and 3/4 inches are mid-diaphragm microphones.Generally speaking, medium-diaphragm microphones are better at capturing instantaneous signals and high-frequency signals, and their sound effects are relatively round and full, with the warm texture of a large-diaphragm microphone. There are also many excellent mid-diaphragm microphones. Small diaphragm microphone At present, there is no final standard for the size of the diaphragm of small-diaphragm microphones, but most professionals and manufacturers believe that all microphones with a diaphragm diameter of less than 5/8 inches are small-diaphragm microphones.In terms of sound effects, small-diaphragm microphones are better at capturing high-frequency and instantaneous signals like mid-diaphragm microphones, but However, its sound is slightly inferior to that of large-diaphragm and mid-diaphragm microphones. This may be due to its relatively small diaphragm area, which is more susceptible to air fluctuations. But it will also bring advantages that large diaphragms cannot have, such as easy control and portability. It is very suitable for personal studios, it will not let you lose too much sound details, and will not take in the subtle noise.The small diaphragm has good high-frequency clarity, moderate sensitivity, relatively simple maintenance, and strong adaptability to the environment. It is often used on-site or voice recording.  Some sound engineers use small diaphragm microphones to record in the studio to find specific sound effects. Generally, large diaphragm, medium diaphragm and small diaphragm have their own characteristics. Large-diaphragm microphones have the highest diaphragm sensitivity, whereas small-diaphragm microphones have the lowest sensitivity. The large diaphragm diaphragm is easy to move and can output a high level even at a relatively low sound pressure level.

Last week I shared with you how to check whether a microphone is suitable for you based on the frequency response. Next is the driving method of the microphone. In fact, there are 3 types of microphones,  Dynamic,  Condenser, and Ribbon.The Ribbon microphone is a microphone that uses aluminum ribbon vibration to generate a signal. It's not very common, so I won't introduce it this time. If you really have the opportunity to use it, just keep in mind that you should never use Phantom power, or your ribbon mic will be burned out, and you will have to spend a lot of money to repair it.What is the most basic difference between Dynamic and Condenser?Dynamic MicrophoneThere is a coil and a magnet in it. After receiving the sound wave, it will vibrate and convert the sound wave into a current signal.The microphone that receives sound in this way has several characteristics:1st, it is not sensitive. Because the current generated by vibrating the permanent magnet is relatively small, it is more difficult to receive relatively small sounds, and the performance of high and low frequencies is not so ideal.2nd, it can accept a fairly large sound signal. Because it is very insensitive, it is especially suitable for very loud volume, such as drum and guitar sounds.3rd, it is very durable. Since it does not have a sophisticated electronic circuit, it is basically a medium that converts sound waves purely by physical movement, so if you accidentally drop it from the third floor, it may still be fine. (But don't do this deliberately, no one is responsible except yourself.)4th, it is relatively cheap. Because of its own characteristics, it is low cost, simple and easy to use.To put it simply, the shortcomings of Dynamic are also its advantages, making it widely used in stage performances and recording studio drum kits and guitar speakers. Some rock bands prefer the unmodified characteristics of this microphone, and insist on using this microphone when recording vocals in the studio. I personally think that as long as it is paired with a good preamp, Dynamic can also record quite good vocals.Condenser MicCondenser Mic needs to be driven by electricity. It has two energized membranes (Capsule), which change the distance between the two metal sheets to generate current signals by changing the distance between the two metal sheets when receiving sound.1st, it needs an external power supply, whether it is the built-in battery or the Phantom power on the mixer or pre-amp. Phantom power refers to an invisible power supply that is fed back into the microphone circuit. Think of it as a microphone socket.2nd, it is very sensitive. Because the metal piece is very light, only a slight sound wave can make it vibrate. The reception performance for each frequency is quite good.3rd, because it is very sensitive, please handle it with care. The particularly large audio capacity will damage it. Dropping it on the carpet accidentally may cause Irreparable  damage. So you see that these condensor mics are carefully stored in a moisture-proof box and are filled with sponge pads, while Dynamic mics are casually packed in leather cases and thrown around.4th, it is relatively expensive. Because it has more precision parts and complicated manufacturing process, even a condenser microphone without any additional functions can be more expensive than a Dynamic microphone with lowered bass pickup.Some people will say that Conderser is used for advanced recording. You can't completely object to this sentence. After all, the cost of purchase and maintenance makes it look very noble, but when it comes to recording quality, I think different people have different opinions. You have to remember that all microphone features are designed to allow you to choose the most suitable microphone according to the situation. If an EMO band came to the studio to recording song with roar ,scream , even if you give you a lot of money, I don’t think you will give it a condenser mic to sing...

Signals are divided into analog and digital, and unless we use MIDI（(Musical Instrument Digital Interface)） recording, almost all musical instruments send Analog signals. However, it is no longer a tape recording, but a digital recording century. Mastering the level of converting analog to digital will determine the quality of most recordings. Therefore, some well-known microphones can be sold at a price of up to 3,000 or 4,000 dollars. Once again, It reminds that the recording is really expensive ...I mean the importance of the microphone.A professor likes to describe recording with offensive and defensive warfare. He said that every song recording has four lines of defense to prevent sound damage, and we'd better take strict precautions at the first line of defense. What is the first line? Choosing a suitable microphone.The parameters are particularly important to us. Today I will introduce three parameters that you have to look at when choosing a microphone: Frequency response, Dynamic/Condenser, Pick-up Pattern. Sometimes we will say that some microphones are "born"  for recording certain musical instruments, or it is the first recommendation when recording a certain instrument, which is to take these characteristics into account.Today I’m introducing Frequency ResponseTo understand how it affects sound, you must first know what frequency is. Frequency is the rate at which something occurs or is repeated over a particular period of time. the unit is Hz.In terms of sound, this frequency generally refers to the sound wave, which is roughly divided into low frequency (20-80Hz), high-low frequency (80-500Hz), intermediate frequency (500-1800Hz), high-intermediate frequency (1800-5000Hz), low-intermediate frequency ( 5-9kHz), high frequency (9kHz-16kHz).Each frequency band has its own sound characteristics. For example, LF is like the rumble of engine operation, and MF is often used for the human voice. Since everything has its own sound characteristics, we will choose the microphone according to how it can reflect the real sound.Of course, these can be adjusted in post-production, but remember that the microphone is the first line of defense to pick up sound, and it is better to solve the problem at the beginning than later.This picture is the frequency response of a microphone. It basically tells us two things1. The frequency range that he can record2. Which part of him is more sensitive or insensitive.As can be seen from the curve, you can record sounds from about 50Hz to 15000Hz, and then basically the part starting from the low to medium frequency is flat, but the response is more sensitive at the middle-high frequencies (in other words, increased Performance) and then reduce the sensitivity at low and high frequencies.As you can see from this picture, this microphone is not suitable for recording bass drums because of the poor performance at low frequencies. It is also not suitable for stringed instruments, because the high-frequency parts do not perform well. So what is this microphone suitable for? Its mid-range to mid-high frequency performance is outstanding, best for recording vocals, while also retaining great reproducibility.

Something you need to know when choose wireless microphone 1. A complete wireless system consists of a transmitter and a receiver, which must be set to the same frequency.If two transmitters work on the same frequency, interference will occur, making the wireless system unusable. At the same time, two transmitters cannot use only one receiver.2. In different countries, the available frequencies are different. Before buying a wireless microphone system, we must first understand the frequency bands supported in our region. Related information can be queried from the national communications department.Because wireless frequencies are also used in television stations, communication equipment, and other fields of wireless communication. Wireless frequencies can be shared, and the frequencies used by others in the same area may be the same as yours. The interference is generated in this case.3. Improving the noise suppression parameters on the receiver can improve protection against interference, but will reduce the range of use. Adjust the squelch to a position that can reliably reduce the noise to the lowest.4. Turn off unnecessary electronic devices, especially computers, CD players, and other digital devices. These are common sources of wireless interference, especially when they are near the receiver. If you must use a computer or digital device, make sure you are at least 3 feet away from the receiver and antenna.5. In actual use, the maximum operating range of the wireless system is different. If it is in a crowded room, it may be only 100 feet, and in an open outdoor, it can reach 1,000 feet.6. The working range of the true-diversity system is certainly better than that of the non-diversity system. UHF is better than VHF.7. The receiver must have one or two external antennas, and there should be an open transmission space between these antennas and the transmitter.

How to maintain wireless microphone? There is an overlap between the maintenance of the wireless microphone and the wired microphone. The article on the maintenance of the wired microphone was written last time, and it will not be repeated here. It is recommended that friends who have not read it can review it first. (Main points and methods for maintaining wired microphones)What we said about the maintenance of wired microphones can be used for the maintenance of wireless microphones. But in addition to this, there are other things to pay attention to wireless microphones. For the wireless microphone system, we first need to check its signal transmitter and receiver. Starting from the signal transmitter, pay special attention to the battery box and its cover. Make sure that the contacts of the battery are clean, and break the deformed contacts back to their original position. This will keep the battery contact firm and stable. After that, use some special cleaners on the connection contacts and gently wipe them with a small brush. Then we turn our attention to the receiver. To check the antenna connector of the receiver, also check the power cord / power supply and the screws used to fix the receiver on the rack to ensure that they are not loose. Turn on the electronic equipment, test all the systems, and adjust the frequency to ensure that the system can work normally at all frequencies. Finally, check the rack itself for problems, and finally clean and lubricate the buckle and wheels. In addition to the regular maintenance of the microphone, we must pay attention to some points in normal use to make the life of the microphone longer. 1. The microphone is a kind of high-sensitivity audio equipment, you must pay attention to handle it gently to avoid falling from a high place. The impact may cause the microphone sensitivity to be reduced or even damaged. If you have a hard time noticing this, you can protect the microphone with an anti-collision ring.2. Do not blow the microphone hard or tap its head to test the sound. The correct test method is to speak into the microphone in a normal tone. It is recommended to use a windshield to avoid not only the  plosive but also saliva from entering the microphone.3. If the microphone is not used for a long time, the battery should be removed and installed when it is in use. If the sound is intermittent during use, it may be caused by insufficient battery power, and a new battery should be replaced in time.4. When not in use, store the microphone in a dry and clean place, avoid storing and using in places with high temperature and humidity, so as not to affect the sensitivity and timbre of the microphone. If your area is hot and humid, you should prepare some sealed boxes and desiccants, and check them more frequently. Although the maintenance work itself may be a bit tedious, when you find that your maintenance work can help solve the hidden dangers during the performance, you will thank your work. No matter how large your company is, develop a preventive maintenance plan for microphones (especially vocal microphones) and other equipment. Only in this way will their service life be longer and more reliable. Of course, the performers will also be grateful for your work.

Main points and methods for maintaining wired microphones Like other equipment in the sound system, the microphone also needs regular cleaning and maintenance, and it is best to include the microphone in your PM plan (preventive maintenance plan).Many people think that a microphone is a device that works well without maintenance. Because most people rarely encounter any trouble when using a microphone in a show. But if you want the microphone to maintain the best working condition, you still need to pay attention to it frequently. In my company, we clean and inspect the company's microphone samples at least twice a year. Cleaning the microphone is not just from a hygienic point of view. When cleaning the microphone, we must also remove the dust and dirt that may affect the microphone response. Important points when cleaning the microphone. First check all microphones one by one to see if there is any obvious damage, then shake the microphone to confirm if there are any loose parts on the microphone.The second is to check and maintain the microphone connector and pins. You can use the "oil-free compression spray gun" or "dust-removing compressed gas tank" to blow away the dust and small gravel in the microphone connector.Next, plug each microphone into the PA separately to see if they work properly.In our experience, the most common problems encountered when cleaning microphones are: dirty microphone components and recessed microphone grilles.Removal of dirt is not a difficult task-you just need to put all the dirty components together and let them clean them thoroughly. Pick out components that are sunken or obviously broken.When cleaning the microphone grille, we use mouthwash and brush with a toothbrush. Alternatively, you can also use a 1: 1 mixed solution of distilled water and isopropyl alcohol as a cleaning agent. If you encounter dirt that clogs the grille, you can use a compressed air spray gun to blow off the dirt, and then put it on a towel to dry.If there is a slight depression on the microphone grille, although it may not affect the performance of the microphone, it looks very unsightly. If the dents of the grille are too severe, it may cause interference to the airflow, and may also touch other components inside the microphone, resulting in increased noise of the microphone, and even damage to the microphone internal components and the diaphragm. Use some common tools to repair the microphone grille. Fortunately, most microphone grilles can be restored to their original shape. For those detachable microphone grills, we only need to use some common tools to make the microphone grill look new. For a spherical microphone grille, find a round screwdriver or hexagon socket at the back of the handle, fix it on the vise, and use the round shape at the back of the handle as an anvil. First remove the inner sponge of the microphone, then align the depression with the handle, and use a mallet / plastic hammer to hammer the grille back into its original shape.For a microphone grill with a flat top, we need to clamp a small wooden tenon to the vise, and then use the flat surface of the wooden tenon as the anvil. The effect will definitely be unexpectedly good. Of course, if the depression of the microphone grille is too large to be repaired, or if it has been damaged, it can only be replaced with a new one. The new microphone grille can be purchased from the manufacturer. The work is not really finished During performances, vocal microphones often suffer from adverse effects such as smoke, lipstick, lipstick, saliva, etc. Therefore, we need to equip the vocal microphone with an external sponge cover. If the microphone is accidentally dropped, the outer sponge cover can also protect and buffer to a certain extent. You can buy dozens of affordable sponge covers and throw them away. Before using the vocal microphone, wipe the microphone grille with medical alcohol cotton. Don't forget to check the microphone connector and the microphone stand and clip. Just in case, it is best to carry several sponge covers in the equipment box for your performance, and also prepare several alternative microphone grills for the vocal microphone. When cleaning the microphone grille, first remove the grille. After cleaning, allow the microphone grille to air dry before reassembly on the microphone.Don't forget to check the microphone clip. Make sure that the plastic clip or rubber clip is not damaged, and adjust the tension screw, so that we can easily adjust the microphone clip while ensuring that the microphone clip is stable. Also check that the connection to the microphone stand is strong enough. If there is slack, it is likely to cause the microphone to fall from the stand. This situation is not only embarrassing, it may also hurt the performer and damage the microphone.If we encounter this problem of slack in the joints, we will use glue that can bond metal and plastic / rubber together.

What makes a wireless microphone system? A wireless microphone system consists of three main parts: an input device, a transmitter, and a receiver. The input device provides an audio signal that can be emitted by the transmitter, which is the microphone portion. It can be a handheld microphone or a "tie clip" microphone. For wireless systems designed specifically for electric guitars, electric guitars are themselves input devices.The transmitter converts the audio signal into a radio frequency signal and broadcasts it through the antenna. The antenna can extend from the bottom of the transmitter, or it can be hidden. The strength of the RF signal is restricted by each country. The effective distance that signals can be transmitted is between 30m and 400m, depending on the conditions of use.There are two basic types of transmitters. One is called a "belt-type" transmitter, which is the size of a pack of cigarettes and can be clipped to a belt. When used on musical instruments, the transmitter can often be stuck on the instrument's strap or directly on the trumpet or saxophone. The other type is used for handheld wireless microphones, whose transmitter is built into the handle of the microphone, so that the size of the wireless microphone is only a little larger than a standard wired microphone. In general, there are many kinds of "microphones" for handheld wireless microphones. All wireless transmitters require a battery, usually a 9-volt alkaline battery.The receiver is to receive the radio frequency signal broadcast by the transmitter and convert it into an audio signal. The output of the receiver is electrically consistent with a standard microphone signal and can be connected to the microphone input port in a sound system.Wireless receivers come in two different configurations. The single-antenna receiver uses a receiving antenna and a tuner, which is the same as a tuner-frequency radio. Single-antenna receivers work well in many situations, but occasionally signal interruptions occur when users walk around the room.Multi-antenna receivers usually have better wireless reception performance. It uses two separate antennas and two independent tuners. A smart circuit in the receiver will automatically select a better signal or combine the two signals into one. Since one of the antennas can receive a clean signal at any time, the chance of signal interruption is much less.Most wireless receivers operate on AC power, but some models installed on video cameras can be powered by batteries.

What's including in an AXT-220D wireless system? Our products are packaged in a beautiful color box. To protect the  products when we send them out, we also pack it with reliable ABF and carton on the outside.After removing the outer protection, you can see the product box, which has a protective sponge inside. It includes a manual, audio output cable, 2 wireless microphones ( two colors to choose), power cable, rack-mounting accessories, 4 high-quality antennas (acceptance range up to 400m), and a digital receiver. AXT-220D AXT-220D is a digital wireless microphone system with 4 high quality antennas.The receiving range is up to 400m.Frequency range: UHF 615-665mhz, 780-820mhzTransmitter type: Bodypack with lapel mic , handheld mic                          View details

500 MHz Band Wireless Microphone SKM9000 513-588 MHz AD-4D 530-580mhz 600 MHz Band Wireless Microphone SKM9000 615-655 MHz EWD1 626-668mhz AXT220D 615-655mhz QLXD4 628-668MHz AD4D 615-655MHz SKM9100 615-655MHz AXT220S 615-655MHz SKM6000 615-655MHz 700 MHz - 800 MHz Band Wireless Microphone AD4D 780-820MHz SKM9000 780-820MHz  ULXD4D 780-820MHz SLX4/SM-58 780-820MHz AXT220D 780-820MHz  AXT200S 780-820MHz EW100G3 830-860MHz EW122 740-780mhz EW335G3 780-820MHz EW135 740-780MHz S-39 740-790MHz Stage in ear monitoring system SR2050 IEM 572-603.5 Mhz606-630 Mhz740-776 Mhz798-830 Mhz EW300 IEM G3 572-603.5 Mhz606-630 Mhz740-776 Mhz798-830 Mhz Active antennas combiner 490-900MHZ

This is a title Super-cardioid microphone Such directional microphones are becoming more and more popular in live performances, such as Beta 58a. On the stage, they can better record the voice of the lead singer and block the sound of surrounding bands. The disadvantage is that it will also record some of the sound behind the microphone. This means that you should not put your monitor in front of you (null points at 127° and 233° ), otherwise you will hear feedback. Supercardioid microphones are usually used in the studio when you need to isolate other sounds to the greatest extent.This type of pointing is very similar to over-cardioid pointing and is often make misunderstanding.Supercardioid directivity is stronger than cardioid directivity and has a sensitive back lobe.Supercardioid microphones have a narrower directivity than cardioids, making them particularly suitable for close range sound pickup. It is particularly special for fixed-point recording of drum sets and pianos, and its directional characteristics are very suitable for live recordings that need to be isolated (sometimes it is to isolate the interference between instruments, sometimes it is to isolate noise). For self-singing performance recordings, the crosstalk of the super-directional microphone is minimal