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How to choose the audio cable?


How to choose the audio cable?




Excellent sound quality is not solely determined by the performance of audio equipment, and AV cables are also an important link that cannot be ignored. AV cable is the abbreviation of Audio Cable and Video Cable in home audio. It can effectively eliminate external electromagnetic interference and transmit the signal authentically, which means that this is a high-quality line.






1. Classification and main functions of home audio




    Home audio is usually divided into two categories: pure audio and home theater audio. Pure audio is also called HI-FI audio, which is composed of pure power amplifier (only two-channel output), speakers and disc player, and is generally used to listen to music and songs. Home theater audio is also called AV combination audio, which can play music and songs in two channels, as well as multi-channel discs. "Audiophiles" generally play pure audio, and mainly listen to Western classical music.




2. The relationship between optical fiber cable, coaxial cable and decoder and power amplifier




    The disc player can "read code" and "decode", but in order to reduce costs, its decoding function is generally relatively rudimentary. To increase the level of "decoding" and make the sound more beautiful, it is necessary to be equipped with an independent decoder and a power amplifier with decoding function. Optical fiber cables are needed between the disc drive and the decoder, and between the disc drive and the decoding power amplifier. It is connected with a coaxial cable and is responsible for transmitting the digital audio signal "read" from the disc player to an independent decoder or a power amplifier with decoding function to "decode" it into an audio signal. This transmission method is often used in high-end audio systems.




3. Audio cables, video cables, and coaxial cables cannot be mixed




    From the outside, the video cable, audio cable, and coaxial cable are all composed of a wire body and terminals at both ends, and they all transmit signals with a metal core inside. Therefore, it is convenient for someone to mix the three at will. This can also turn on the signal, but the sound quality and picture quality are definitely impaired.




4. Compare the conditions that two AV cables with the same function should have:




The prices and grades of the two must be close;




The same set of speakers, the same piece of music, the same volume, and the same listening environment must be used;




The audio and audition discs used must be mid-to-high-end, too low-end will make noise by itself, so it is difficult to compare.




The necessity of choosing a reasonable AV cable for the audio




    The AV cable, which undertakes the task of audio transmission signal, plays an important role in the entire audio system. A good audio cable and a poor audio cable not only use different materials, but also have different internal structural principles. Therefore, there are certain differences in signal transmission performance and resistance to external electromagnetic interference.




    High-end audio is equipped with high-end audio cable, mid-range audio is equipped with mid-range audio cable, and low-end audio is equipped with low-end audio cable. This is the most reasonable investment principle to ensure the best performance of audio. Someone bought high-end audio, but chose a low-end audio cable to save money. This is no different from driving a Mercedes-Benz to a gas station and adding the cheapest 90# gasoline. On the surface, it saves money, but the actual effect is not good. The best performance of the car.




Usually in the high-end audio configuration, the investment ratio of the audio line is 15%~30%, which is more reasonable. Even for general audio, you cannot use a too low-grade AV cable, because this will not only attenuate the signal, but the transmitted signal is susceptible to external electromagnetic interference, which will eventually cause sound distortion.




Precautions for AV cable use and maintenance 



If you can pay attention to the following aspects of the AV cable in use, it will not only improve the sound performance, but also extend the service life of the cable:




1. Cables with different functions cannot be mixed at will, for example, audio cables cannot be used instead of coaxial cables;




2. Try not to bend the AV cable when using it, and it is best to keep it away from the power supply;




3. The AV cable should be as short as possible if it is sufficient, the excess length will only increase the signal loss;




4. The size of the speaker cable should be selected according to the size of the audio power. If it is too small, the signal transmission will be delayed, and the speaker will not produce good sound; if it is too small, the signal loss will increase, and the burden on the power amplifier will increase, and the speaker will also not produce good sound;




5. The connection between the AV cable and the outside must be tight. If the contact is poor (such as collapse, etc.), it will cause noise from the speaker, and in serious cases, it will cause the components to burn out;




6. After the AV cable is used for a certain number of years, the metal terminals and the metal core may be oxidized (ie "aging"), which will affect the sound effect, and should be replaced according to the actual situation.