[Home Theater Network HDAV.com.cn] Due to people's endless pursuit of sound quality, coupled with the continuous improvement of industrial design and manufacturing level, the audio products on the market are dazzling and fascinating. In order to sell these products and obtain high profits, some merchants use the subjective and abstract features of sound to blow the sound, making audio equipment more mysterious. Some of the "writing hands" with ulterior motives are even more helpful, spreading the "fever" language that they don't understand through various media. I thought I realized that the mysterious audio enthusiasts, who called themselves "fans", formed a special consumer group.
It is impossible to verify that the original meaning of the word "fever" is 褒 or 贬, but the irrational and even erroneous views that are scattered among them are everywhere. Some people swear some imaginary things that violate acoustics and even electrical common sense, but doubt the most basic acoustic common sense. With the increasing popularity of audio products, these misconceptions have spread to consumers, causing unique abnormalities in the audio industry. The driving of interests has made individual manufacturers more intensive, creating or spreading various lies. The consumer's cultivating psychology made the fake foreign brand rampant, and the foreigner became a foreign brand on the flyer. The foreigner became a product designer next to the speaker. Some pseudo-scientific products are under the banner of foreign technology, and they will be popular when they have passed the inferior technical packaging. Some irresponsible media opportunities are ignited in the back. The noise on the publicity has caused the sorrow of ordinary consumers, and many technicians are also people, and they are inadvertently rumored in various opportunities. Irrational propaganda makes manufacturers no longer pay attention to product technology and quality, but also pay more attention to packaging and hype. There are several companies with annual sales of nearly 300 million packages that are high-end images. Among them, there are only one or two speaker designers. We cannot but doubt the electroacoustic performance of their products. More even the minimum test equipment and decent technical staff did not, only rely on the boss's ear to debug, such speakers to the market but sold at a very high price. In this case, it is necessary to write an article to clarify some misunderstandings in audio products, prompting manufacturers to return to science, return to rationality, scientifically design products, and correctly guide consumption. Also appeal to consumers to mature consumption concept, do not blindly follow and trust in the purchase of audio equipment, do not blindly worship the ocean, identify various exaggerated and false views. Among these misconceptions, there are conceptual aspects, as well as equipment use. Due to space limitations, only a few of them can be mentioned here.
Replaying the original sound without distortion is the ultimate goal of audio equipment, which is not possible with current technology. The closest proximity to the original sound is called “high fidelity,†but the concept is limited to equipment and does not include recordings, as discussed below. According to this definition, audio equipment should not be reprocessed with sound. In fact, many enthusiasts have divided them into "British sounds", "American sounds", "tone warmth", "cool sounds" or something. I don't deny that the equipment has a sound, but it is definitely not a high-fidelity equipment! Remember, audio equipment only needs to be replayed, no need to create, no need for its own sound. Just like a color TV, it doesn't have any color casts. It must adjust the white balance to make the three primary colors suitable. No consumer or color power plant wants their products to be reddish or greenish. The final color displayed on the color TV is related to the color of the scene itself, the fidelity of the camera, and post-production.
The creation of the sound in the sound should be done by the sound engineer. Due to the difference in recording equipment and the level and dislike of the sound engineer, the recording has a timbre, which is cold and warm. So I think the sound source is the most important in the whole replay, it finally meets the different needs of users. The sound source here does not refer to a CD or DVD player, but to a music carrier such as a disc. The sound is recorded well, even if the equipment is a little bit worse, it will have a good effect. Some people bought expensive amplifiers and speakers, but listened to some unregulated discs with poor recordings. Just like if you bought a high-definition color TV, but you watched it in a bad place in the mountainous area, the effect is not as good as the cable TV to see the ordinary color TV. The American sounds and the British sounds mentioned above are mostly influenced by the character of different nationalities, or the difference of music itself, not the difference of audio equipment. American music is more intense, and they are related to a wild immigrant country. Music in Europe is relatively mild and is related to the stability of the people of these countries. There are also some sayings that if a layer of furry wool is applied to the horn diaphragm, they say that the sound is warm; if it is a metal film, they say that the sound is cold and metallic, which is wrong, there is no need. contact. In fact, this is the effect of vision on hearing. Just like red gives a feeling of "hot", and blue gives a feeling of "cold". In fact, blue does not lower the ambient temperature, it is just a subjective feeling of human beings. I admit that there are people who have high musical literacy and even deep music. They often listen to some live music (such as concerts) and often listen to some different music equipment and discs. This will be good for some audio equipment. Bad identification. In fact, because of my hobbies and work, I am also a member of the above. But if someone pulls me into a store to judge the sound quality of a set of speakers, I said I can't hear it.
This is by no means modest, but because the sound that people finally hear through the sound is a combination of many factors. There are the most important factors in recording, as well as the factors of the disc player, amplifier, speaker, and listening environment. Therefore, it is difficult to give an accurate evaluation to only one of the links, such as the speaker, unless you let the other links be the same. In two different articles in two different "Fever Magazines", the two authors used the same equipment to appreciate the same music, and of course they did everything they could to admit the final sound. But one author is promoting the power amplifier, saying that this wonderful voice is the credit of the amplifier; the other author is promoting the speaker, of course, it is the credit of the speaker. We can see that these two statements are contradictory in themselves. How do you prove the credit of the final sound? Just like we see a color TV is very clear, if it is determined that the quality of the signal source is good or the quality of the TV is good, it is wrong. The correct way is to use the same amplifier to compare the differences between different speakers or use the same speakers to compare different amplifiers. The subjectivity of the sound is very strong, it is invisible, and it is easy to change the position by the hints of the people around. If you are comparing the effects of two sets of speakers A and B, someone said to you: "Is B better than A?", you generally say "yes", otherwise he will always say that A is better than B. Where until you admit it. Another time I was debugging a speaker, an enthusiast said that somewhere in this speaker is not very good, please reduce that capacitor a little, but I don't think so. In order to convince him, he still changed a capacitor that was actually the same. He listened to "a lot better". I told him that I didn't change, and that he was suspicious. An enthusiast bought a pair of "imported" speakers and went back to show off how good it was. However, after this "imported" speaker was exposed as a fake foreign brand by the TV station, he did not listen to it.
Therefore, we don't have to be superstitious about "golden ears". We can't hear the difference and don't have to blame ourselves for being inferior. In particular, be wary of those who claim to be "golden ears" but who sell their products or products with some purpose. In fact, the sales promotion in front of the audio equipment counters are all direct sales personnel hired by the brand manufacturers themselves. These personnel have received special training before they go to work. The content of the training is in addition to the exaggerated product functions and information about the enterprise. Some tips for deceiving customers. Many manufacturers and businesses use the characteristics of sound to promote something vain and deceive consumers. I remember that at a qigong "gathering" meeting, the qigong master said that to a certain extent, he would feel a stream of air along a certain path of the body. Under his suggestion, many students seemed to have this feeling later. Some "fever" languages ​​are quite similar to qigong. The range of audio equipment is very wide, only speakers are discussed here. Is the sound quality and objective indicators of the speakers one-to-one? The answer is yes. There is a lot of doubts about such a common-sense proposition. They think the indicators are good, the sound quality is not necessarily good, and vice versa. Then, please ask: What is the reason for the good sound quality in addition to the physical indicators? Is it a spiritual factor?
However, the physical indicators here are by no means a simple project. Some people tested the frequency response, distortion, etc. of a speaker. The data was very good. I listened to this speaker and found that the sound quality is not as good as another box with bad data. The conclusion is as follows. mistake. In fact, there are many indicators describing the acoustic performance of a speaker, as well as directivity, transient characteristics, delay characteristics, phase characteristics, harmonic ratio, and so on. Some measurements are very complex, some features are not measured by common instruments, some are unable to get accurate results, and some of the indicators and subjective evaluations are still controversial, let alone test. At present, the most frequently measured axial frequency response and total harmonic distortion are only the most easily obtained test results, but these two are not fully representative of the sound quality of the speaker. That is to say, in the current measurement content, good data is not a sufficient condition for a good speaker.
But it is definitely a necessary condition! A good speaker of the data is not necessarily a good speaker, but the speaker is not a good speaker. Some manufacturers deny this, which is actually a cover for their lack of test equipment. Establish a decent anechoic chamber (low frequency lower limit is 50Hz) and B&K instruments need to invest about 1 million. Does the speaker factory in the domestic fever industry have such a anechoic chamber? At the same time, some famous ones have a long history. The foreign speaker factory has attached great importance to the data. The author has measured the frequency response curve of the sounds of foreign famous factories such as B&W, which is surprisingly straight. It is no wonder that there are so many people who like the sound quality. The reason why the speaker curve does not have to be straight is also popular. It is said that these tests are measured in the anechoic chamber, and the listening is in a normal room, which adds a lot of peaks and valleys to the straight curve. So the flat frequency response obtained in the anechoic chamber is meaningless. This sentence sounds very reasonable, but it is completely wrong. We know that the speaker is used to maximize the fidelity of the original sound. Take the violin playing as an example. I hope that in the same environment, the speaker can replace the live effect of the violin. Please note that the emphasis is on the “same environmentâ€. The effect of the violin in different environments is different. The reason is that the acoustic parameters of the building are different in different environments. Suppose we put the sound of the violin in the anechoic room into a straight line, then the sound coming out of the ordinary room is definitely not a curve, but a lot of peaks and valleys are superimposed due to environmental reasons. Does this mean that the violin is not fidelity at this time? Obviously not. Similarly, assuming that the speaker is measured in the anechoic chamber and the frequency is flat (equivalent to the normalized violin), which means that there is a chance to fidelity replay the original sound, then it is not guaranteed in the ordinary room. Is it true? In fact, the anechoic chamber is a necessary tool in sound design for this reason: it can more easily measure the fidelity of the speaker, and its acoustic model is simple, the control parameters are few, and it is easy to be copied.
When consumers choose audio, don't simply think that "a penny is worth the goods". A speaker with a luxurious appearance and high selling price is not necessarily a good speaker. I have tested a counterfeit foreign brand that sells more than 10,000 yuan. Its appearance is a combination of modern speaker luxury - curved back panel, bright paint, aluminum basin frame, aluminum decorative ring, etc. The unevenness is large, and it is obvious that the polarity is reversed at the crossover point. The pair of speakers have been blown up by some magazines and enthusiasts. A certain model of a brand has a mid-high sound distance of nearly half a meter in the unit layout. How can the sound image be positioned accurately? From mono to stereo to the nearest surround sound, the technology advances and the user feels Unprecedented sound effects like never before. However, some people seem to hear something that goes beyond the scope of equipment replay and violates the basic principles. Others use the subjectivity of sound to mislead the audience and blow some inferior techniques to the gods. In fact, these statements violate the most basic point of view of acoustics and even electricity. The so-called stereo is actually just two channels, and this simple format is widely respected in "fans." In fact, strictly speaking, the term "stereo" is wrong. Even the "flat sound" is not true. If you ignore the distance between the speakers in the speaker (such as coaxial), ignore the reflection of the room. The sound we hear is just a line segment between the two speaker units. This kind of statement may surprise many enthusiasts, but the fact is this. If you don't believe, please let go of your imagination and carefully experience it in front of your home's "stereo" speakers. Some "fans" heard the thunder and felt that their position was on the head, and the water was flowing from the ground; the violin was ringing at the shoulder, and the erhu was on the left knee, which was purely their subjective reverie. Wishful thinking, if someone is misleading you in this way, don't blame yourself for not being a "golden ear."
Multi-channel formats such as DTS and AC-3 create surround sound, which allows us to hear more than “line segmentsâ€. However, this format has been protected by strict property rights, and its coding method has been widely adopted by software vendors. Some manufacturers can seamlessly drill, and they think of deception, creating so-called two-channel surround sound. I did not expect that some people actually believed that this "technology" was actually sold in China. They are forced to attach some acoustic terms, trying to make a huge profit through a simple means. Due to space limitations, only one of his mistakes is revealed here. In one of his "techniques", he used his exaggerated language to say that the use of the latter two speakers can produce AC-3 effects, and even ordinary two-channel programs can have real surround sound effects through their processing. This is really incredible. We have analyzed above, no matter what technology is used, at most, the sound field will be expanded, but the sound of the two speakers can only be in the line segment constructed by the two speakers, and it is impossible to make any surround sound. Investigating its working principle, generally adopt two methods: 1. The left and right channel electrical frequency is staggered and undulating; 2. The left and right channel signals are staggered and undulating. This subjectively does have the feeling of expanding the sound field, but the extended sound field has actually lost the original position of the sound, violating the most basic principles of high security. The promoters dare to say that after using "the emperor is everywhere (the area where the stereo feels the best)", it is actually "there is no emperor everywhere". If you want to get the effect of virtual surround sound is very simple, you can do a test immediately: the left and right speakers are reversed, you will hear an extended sound field. This approach believes that no one will like it, but it becomes the theoretical basis of some virtual surround sound.
He also said that if this technique is used, the hidden surround sound in the two-channel program can be separated and reproduced, so that even the two-channel program can produce true surround sound, and the "virtual surround sound" is sublimated to "real." Surround sound, this is ridiculous! So far there is no (and impossible) such a smart microphone, he can distinguish the difference between ambient sound and direct sound, how can it be extracted? It is like a color TV If the TV station emits black and white TV signals, no matter how hard you try at the terminal, no real color can appear. Recently, I saw a newly developed digital camera from a brand-name manufacturer claiming to be able to directly record a 5.1-channel DVD. You can imagine that this is technically impossible. 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 is transferred from love video. The article is an independent view of the author and does not represent the position of the home theater network.
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