Purchase of wireless microphone
Many KTV bosses are complaining about the high damage rate of private room microphones. In fact, as long as the correct selection and use of wireless microphones can extend the life of the microphone. Below we will introduce the precautions for the purchase and use of KTV private wireless microphones.
1. The choice between price and quality
As the saying goes: "One cent, one cent", consumers often buy products of poor quality because they are greedy for a little bit of price. How to choose a value-for-money model, first respond to the quality positioning you require, and further understand the principles of how to evaluate the quality of KTV microphones, in order to choose a truly satisfactory product.
2. The technical background of the manufacturer determines the quality of the product
Wireless karaoke microphone products are products designed by combining audio and wireless communication technology, and are completely different from the technology and equipment for manufacturing wired microphones. Therefore, wired microphone manufacturers that also manufacture "microphones" may not be able to manufacture wireless karaoke microphones and wireless communication products. Manufacturers may not be able to make good wireless karaoke microphones, and only manufacturers with long-term professional audio technology and wireless high-frequency technology background can make good wireless karaoke microphones.
Second, the use of K package wireless microphone
The correct use of wireless microphones is a very important aspect of their performance. Sometimes improper use methods, the lighter ones are the expensive microphones, and the more serious ones may cause damage.
①Do not hold two wireless microphones together
Since the handheld wireless microphone is two transmitters, it will generate harmonic pool itself. When the two wireless microphones are close to each other, the harmonics between them will modulate each other, causing interference, which seriously affects the transmission and reception and sound quality.
②Avoid the microphone facing the speaker directly
If the microphone is directly facing the speaker, as far as the sound system is concerned, a closed loop is formed, which will generate positive feedback oscillation (howling), which must be avoided.
③ Do not hold your hands on the microphone head
This is because all microphone receivers have a certain directivity. If you hold the upper part of the grille with your hand, it will seriously damage the frequency response, and it will also cause focus, feedback, etc. due to the gathering effect of the palm.
④ Do not hold the microphone's antenna emission part
In general handheld microphones, the transmitting circuit and antenna are located at the lower part of the microphone (away from the microphone). When we hold it with our hands, it will greatly attenuate the transmission power and affect the reception effect.
⑤Don't get too close to the microphone
In use, the distance between the microphone and the mouth is generally kept at 5-10 cm. If it is too close, it will produce a near-speaking effect. If it is too far, the sound is very light, which will destroy the sound quality.
A good wireless microphone should have the following advantages
1. Appearance has a design conforming to ergonomics and aesthetic basis:
The body of the hand-held wireless microphone must have a size and beautiful shape suitable for holding by the hand. Generally, the traditional body of the tube is in the shape of a bamboo tube or trapezoid, which is not only aesthetically pleasing, but also not suitable for holding by the hand, especially for those who are prone to sweat. The user is less likely to grip and slip. The most suitable shape for holding is a double inner curve shape with a smaller diameter in the middle than at both ends, just like a Chinese Guanyin bottle or a woman's waist, which is not only beautiful in shape but also easy to hold.
2. Hand-held microphone should adopt advanced hidden antenna design:
The biggest difference between man and monkey is that there is no tail. Earlier wireless microphones were connected to an antenna at the end, and advanced wireless microphones overcome technical difficulties. They no longer use outdated external designs, but use the most perfect hidden antenna design to make wireless microphones easy to use. The advantages of safety, beauty and no breakage.
3. To assemble a good sound head:
The quality of the sound head determines the first pass of the quality of the wireless microphone. There are two types of sound heads: moving coil type and capacitive type. The moving coil type uses a coil loaded on the diaphragm to convert sound energy into electrical energy signals between high-density magnetic fields. There are certain limits on the voice coil characteristics of this sound head. But the basic structure is simple and the price is cheap, it is the most popular model on the market. The condenser microphone is a microphone with a higher technical level combining electronics and structure. Its pronunciation is to use the change of the inter-electrode capacitance, and the ultra-thin gold-plated vibration film directly converts the sound into electrical energy signals. The most important feature of advanced condenser microphones is that they can show extremely clear original sound quality. The high and low frequency responses are very wide and flat, the sensitivity is very high, the directivity and dynamic range are large, the distortion rate is small, the volume is light and durable, and the touch noise is low. Used in professional equipment such as recording studios, professional stage, test instruments and so on. The only disadvantage is the need to provide bias (Phantom Power), but because the wireless microphone itself has a power supply, the condenser head is the best match for the wireless microphone, so that all the advantages are fully exerted on the wireless microphone. At present, MIPRO wireless microphones in Taiwan are the only products equipped with advanced condenser headphones.
4. The microphone should have the superior characteristics of low touch noise:
Hand-held wireless microphones produce frictional touch noise between the palm and the hand, which affects the normal sound quality. Especially the wireless microphone itself has a sensitive preamplifier, which makes this touch noise performance more serious and becomes a technical bottleneck. . The general wireless microphone has no professional design experience, and in order to reduce the manufacturing cost, it uses a simple circuit, selects a cheap sound head, poor suspension design and cheap tube surface treatment, so the unclear sound quality can not overcome the significant microphone Touch noise makes the original sound worse, so when choosing a wireless microphone with good quality, special attention must be paid to the characteristics of extremely clear sound quality and ultra-low touch noise.
5. With the function of eliminating sound interruption or instability:
The signal transmitted by the wireless microphone is attracted and reflected by the surrounding environment, resulting in the phenomenon of dead angle of the signal received by the receiving antenna, which causes the output sound to be interrupted or unstable. This phenomenon is not allowed especially in professional occasions. occur. In order to solve this shortcoming, only the most advanced automatic selection receiving system can achieve the most perfect effect. Generally, the cheap dual-channel receivers that are popular in the market do not have this automatic selective receiving function, and cannot avoid the above-mentioned shortcomings, so they can only be used in short-distance family karaoke occasions. In a professional place or users who value sound quality, they must choose the model of the automatic signal receiving system to meet the sound quality requirements and obtain a perfect performance.
6. It has the function of preventing loud noise from being interfered by standby:
Most receivers generally have a mute control function (Squelch Control). When the power is turned on and there is no microphone signal input or the signal strength is lower than a certain signal-to-noise ratio, the mute control circuit will close the output circuit, the main receiver is completely mute, to prevent noise Output. When the microphone signal is turned on, the receiver immediately activates the mute circuit to let the audio circuit output the sound of the microphone. However, when the microphone power is turned on and off, or when the microphone signal is turned off, occasionally encounter signal interference that exceeds the mute control strength, the receiver mute circuit will also be activated by these impact noise and interference noise to output a loud noise. In order to solve this deficiency, the so-called "audio lock mute circuit" is added to the advanced models to suppress it. The principle is to add a fixed super audio modulation signal to the microphone's transmission signal: at the same time, a discriminator is also installed inside the receiver, so the receiver must receive the microphone signal containing this fixed super audio modulation signal. Only then can the output circuit be activated to prevent the interference of other signals or noise. In order to protect your valuable audio system from being damaged by loud noise, you must choose a model with a sound code lock and mute function.
7. With multi-channel non-interference function:
The biggest technical bottleneck in the use of wireless microphones is the problem of signal interference, especially the more frequently used, the more serious the problem of interference, so in the case of using multiple wireless microphones at the same place, to avoid interference, in addition to careful selection of physical In addition to the frequency that does not interfere with each other and avoid the interference of adjacent external signals, the receiver must have excellent selectivity, and the transmitted and received radiation harmonics must be filtered very cleanly to avoid mutual interference of the signals. Generally, the receiver of the VHF frequency band can be used for 12 frequencies at the same time. It is very good to use the MIPRO products in Taiwan, which can use 24 frequencies at the same time without interfering with each other. Even under specific conditions, they are specially designed And arrangements, you can achieve more frequencies simultaneously.
8. To solve the simultaneous use of multiple channels and to avoid interference, multi-channel series models with digital locking that can change the frequency should be selected:
The traditional wireless microphone system is designed with a fixed frequency of quartz lock. This type of model cannot be arbitrarily replaced in the occasion of multi-channel use or encounters strong signal interference, but must be replaced by the entire unit. . In order to solve this deficiency, the advanced models adopt the phase locked frequency synthesis (PLL Synthesized) method. Pre-stored dozens of frequencies in the transmitter and receiver can allow users to change at will. However, it provides a very convenient function for distribution and users, and completely solves the above-mentioned lack. Taiwan has already produced a complete series of products with the most advanced design and the most reasonable price at this energy production of MIPRO.
9. To avoid frequency "traffic jam" or signal interference, products with digitally locked UHF channel system should be selected:
Due to the current use of too many wireless microphones in the VHF200MHz band, the problems of signal interference and various electrical noises are becoming more and more serious. Therefore, the frequency of professional wireless microphones has recently been gradually raised to the 800MHz UHF band, and the PLL phase is used. Locking circuit, preset multi-channel design can be switched arbitrarily, to avoid interference of other signals and general electrical noise, to obtain the best use effect. Because the circuit design of the UHF band is more complicated and the high-frequency parts used are also more precise, the current price is still relatively high, and there are few mass-produced manufacturers. However, the UHF model is the best choice for professional quality and has gradually become the future. Popular trends. Taiwan still has mass production of a full range of advanced models and complete peripheral equipment with MIPRO.
10. Products with international quality certification and passing the telecom regulations:
Excellent wireless microphone products must be manufactured by factories that have passed international quality certification and must also be certified by the national radio wave regulations before they can be legally sold and used. Consumers should choose to use certified products to ensure quality.