[Home Theater Network HDAV.com.cn] Excellent sound quality is not determined by the performance of audio equipment alone, AV cable is also an important part of it can not be ignored. The AV cable is an abbreviation for Audio Cable and Vidio Cable in Home Audio. It can effectively eliminate external electromagnetic interference and transmit signals in an original way, which is a high-quality line.
1. Classification and main functions of home audio 　　
Home audio is usually divided into pure audio and home theater audio. Pure audio is also called HI-FI audio, composed of pure power amplifier (only two channels output), speakers and disc players, generally used to listen to music and songs. Home theater audio is also called AV stereo, which can play music and songs in two channels, and can also play multi-channel discs. "Hot enthusiasts" generally play pure audio, and mainly listen to Western classical music.
2. The relationship between fiber optic cable, coaxial cable and decoder and power amplifier
The disc player can "read code" and "decode", but in order to reduce the cost, its decoding function is generally relatively primitive. To improve the "decoding" level and make the sound more awkward, you need to equip the independent decoder and the amplifier with decoding function. The fiber optic cable is needed between the disc player and the decoder, between the disc player and the decoding amplifier. Connected with the coaxial line, it is responsible for transmitting the digital audio signal "read" by the disc player to an independent decoder or a power amplifier with decoding function to "decode" into an audio signal. This type of transmission is often used in mid- to high-end audio.
3. Audio cable, video cable, and coaxial cable cannot be mixed.
From the outside, the video line, the audio line and the coaxial line are composed of the line body and the terminals at both ends, and the signals are transmitted by the metal core inside. Therefore, some people can easily and casually mix the three. This also turns on the signal, but the sound quality and picture quality are definitely impaired.
4. Compare the conditions for two AV cables with the same function:
1 The price and grade of both must be close;
2 must use the same set of sound, the same piece of music, the same volume, the same listening environment;
The sound and audition discs used in the 3 must be medium to high-end, and the low-end files themselves will emit noise, which is difficult to compare.
The necessity of matching a reasonable AV cable to the audio
The role of the AV line that undertakes the audio transmission signal task is crucial in the entire set of sound. The good sound line and the poor sound line are not only selected materials, but also the internal structural principles are different, so there is a certain difference between the signal transmission performance and the performance against 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 effect of audio. Some people bought a high-end audio, but in order to save money, they chose a low-end audio cable. 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, the actual effect is not good, and it can't play Mercedes-Benz. The best performance of the car.
Usually in the mid-to-high-end audio configuration, the proportion of investment in the audio line is 15% to 30%. Even for general audio, you can't use too low AV cable, because it will not only attenuate the signal, but also the transmitted signal is susceptible to external electromagnetic interference, which eventually leads to distortion of the sound.
AV cable use and maintenance precautions
If the AV cable is used in the following aspects, it can not only improve the performance of the sound, but also extend the life of the wire:
1. Lines with different functions cannot be mixed at will, for example, audio lines cannot be used to replace coaxial lines;
2. The AV cable should be bent as much as possible during use, and it is better to stay away from the power supply;
3. The AV line should be as short as possible on the premise that it is sufficient, and the extra 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. Too small, the signal transmission is delayed, the speaker can't make a good sound; too much, the signal loss increases, the power amplifier burden increases, and the speaker can't make a good sound;
5. The connection between the AV cable and the outside must be tightened. If the contact is bad (such as collapse, etc.), it will cause the sound to make noise, and serious components will burn out;
6. After the AV cable has been used for a certain period of time, the metal terminals and the metal core may be oxidized (ie, "aged"), which will affect the sound effect and should be replaced according to the actual situation.
More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.
Note: This article was transferred from the Xiamen Advanced Audiovisual Exhibition. The article is an independent view of the author and does not represent the position of the home theater network.
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