Audio entry and consultation must read

Many audio enthusiasts and enthusiasts need to solve the problems in the audio practice, and the network provides us with such a convenience. In the new era of audio and video, I saw many of the same basic doubts or problems. In addition to consulting, many of them are basic conceptual problems. I have recently summarized them. As a top post here, I hope that newcomers can ask questions. Look, this may reduce a lot of posts. Welcome everyone to discuss together, what is wrong, please criticize and correct.

First, on how to ask questions

This is an old topic, and some moderators have proposed to post their posts too!

Home environment to buy a home theater (ie multi-channel system) or music system (ie stereo or Hi-Fi), when asked questions, we hope that one is to explain what your expectations of the system? How much do you plan to spend on your system? What is the size of your listening room? These are all essential elements for asking questions. Some newcomers who have just arrived, don't know how to ask questions, it doesn't matter. I just hope that everyone will do this, so your question may be answered faster by the masters. If the question does not have these elements, the answers from others are meaningless to you and have no operability.

At the very least, you have to make clear your question!

See some friends asking questions, where is the topic only? I hope that I will not ask questions like this. This is a disrespect for our labor, or it means that you lack certain cultivation. DX, how many words do you want to answer a question, have you thought about it? I am not a big shelf. I am sorry to see such a problem. I generally do not answer it.

Second, what kind of sound do you need?

If you want to build a beloved sound system or a home theater system, listening is an important element and a theme that we all pursue forever. But those who have just touched the sound and have had a listening experience have different listening experiences for the same system, and this must be understood. In different environments, the differences between different system settings and adjustments are also very obvious and even quite large.

Home theater and audio are a kind of psychologically suggestive consumption, and are sensory needs. The requirements for the system have a great relationship with each person's culture, concept, experience, environment, etc., and are also different.

But this kind of sense is invisible, and comparison and evaluation are more difficult. The average consumer can only listen to the ears of so-called enthusiasts who have experience around them. Because of the level of deviation of each person, I still read some audio and video professional media before purchasing. Audio-visual professional media currently distributes culture and practical classes. Generally, audio and video consumers should not read the media of fever culture. Power believes that domestic practical audio-visual magazines include "Home Theater Technology", "Audio-Visual Technology", "Practical Video Technology" and so on. The magazines of fever culture include "Hi-Fi Audio", "Audio World", "Modern Sound Technology" and "Audio Technology".

Conditional access to audio and video professional websites and forums. I haven't seen the forum of audio and video professional media websites better than us, and we are more lively than us. Other websites are also good, such as Regarding the information and communication on playing discs, there are very good professional websites in China, which are better than ours, such as DVD incomplete manuals.

Here I have to explain the changes in the listening needs of most people, this change is fast. Generally speaking, just touching the sound likes the kind of fire and bright sound, but it doesn't feel like a good sound. So some domestic audio brands have so over-repaired the high and low frequencies of the sound reduction process to satisfy the hobby of the mass consumers. Usually it is rejected by the enthusiasts as garbage. Therefore, it is easy for an enthusiast to buy a sound for a novice. However, as long as the average consumer can buy the audio back and listen to a month or even a shorter time, the demand for the sound will change. Congratulations, you are approaching in the right direction. This change in demand, whether you are a home theater or a pure music system, is basically the same. Welcome to the home theater for more details

So what is the characteristic of this sound? Simply put, it is really pleasant to listen to, comfortable, low-frequency powerful and clean, high-frequency moderate and clear, the middle part of the sound is full, listening to your system for a long time is not irritating. It turns out that you don't really like the harsh, irritating sound.

After understanding the above characteristics of audio consumption, then what type of sound system do you need? There should be a goal in general, so that the store is also a good friend, so that you can give you appropriate help according to your needs. It's like you are looking for a girlfriend. It's not useful for others to look right or not. The key is you. Audio consumption is very user-friendly and personal, and it has something to do with many of your factors.

The last word of advice, the audio is for you, not for enthusiasts, not for getting a good review. After the system is set up, don't find yourself uncomfortable, enjoy your system!

In this passage, I hope that everyone will pay attention to it when formulating the system plan. If your system is supposed to be a display, if the sound is good or bad, you can skip it.

Third, the difference between domestic audio and imported audio

Although domestic audio has made gratifying progress in the harsh market in recent years, we should admit that compared with foreign old-fashioned audio, there is still a certain gap in domestic audio.

Domestic audio, especially some relatively old brands, such as Swans, Hewlett-Packard, Grand Hyatt, Octopus, Zhongshen, Fengzhisheng, Tianyi, Spock, Shengya, Xindike, Oubo, and later Ke Ke, He Shi, Jinyang, Qinpu, etc., will do audio products, and some have learned the market operation this year. CAV, Ailang, etc. are audio brands that are completely in accordance with market specifications. Domestic audio is better in material selection, and it does not care about the cost. For example, the power output of the power amplifier is sufficient, and the function is more suitable for the karaoke design with better effect. However, the lack of domestic power amplifiers is the design of digital systems. After all, it is our shortcoming.

Foreign audio, the design is more rigorous, a penny of goods, cost control is very strict. However, the performance of digital design is better than that of the domestic ones, and the sound performance of the equipment is highly respected. It is better to buy imported goods at a medium to high price. Especially for high-end products, domestic audio can't compete with it.

Fourth, about the impedance

According to the current national laws and regulations, the products must be monitored according to certain quality standards before leaving the factory and the relevant technical indicators are indicated in the products and manuals. The speakers are also good amps. Generally, the impedance indicators are given in the product data. Most audio consumers are confused.

Here to tell you that for users using tube amps, the impedance must be strictly matched, but the output impedance of the general tube amp is 4, 8, 16 ohms, and the impedance of many speakers is 6 ohms, which can only be accommodated, using 4 Ohmic or 8 ohm terminal. For the transistor amplifiers that are commonly used nowadays, there is no need to consider the problem of impedance matching in the collocation. Originally, the transistor power amplifier does not have the problem of output impedance. The impedance of the power amplifier we see is actually the measurement condition of the rated output power of the power amplifier.

As for the sound field imbalance caused by the different impedances of the speakers of each channel, it can theoretically be solved by the sound field balance function of the AV amplifier. This is also a modification, because of our consumption level or product limitation. As a strict AV system, the speakers of each channel have at least the same or similar characteristics. Originally, the sound field balance of the AV power amplifier mainly adjusts the sound pressure imbalance caused by the different distances of the speakers, and there is a small difference in the sensitivity of the balance of each channel speaker.

Five, about the subwoofer

It is really necessary to configure the subwoofer in the home theater system, but it does not matter if the conditions are not allowed. As a sound system, there is no standard to check, but as a home theater, less than 5 speakers will be effective. Far. For the general Hi-Fi system, it is not recommended to configure the subwoofer. It is not fun.

Tuning of the subwoofer is an experience, if you ask for it. There are generally problems with frequency connection, phase problems, and volume problems. Under normal circumstances, there is no uniform standard for these people, you feel comfortable. If the subwoofer's horn is as large as 8 inches or more, the subwoofer's cutoff frequency is generally lowered to 120Hz or below. If the subwoofer's caliber is small, it is increased, such as 160Hz and above.

The phase needs to be judged by listening. Generally, the cheap subwoofer has only the positive and negative reverse switch, so that others can help adjust the switch repeatedly. You listen to the normal listening position. If the bass is aggravated, the sound is strong and powerful, then the position is Fixed, only need to adjust once. Of course, this time you must use the bass audition disc to match. The phase of some advanced subwoofers can be adjusted continuously (0-180).

The volume is that the subwoofer cannot exceed the volume of the main speaker. If it passes, the sound will be blurred. Listening to your head for a long time is not comfortable. Of course, when the volume of the main speaker changes, the volume of the subwoofer must also be adjusted. So the subwoofer is equipped with a remote control is very necessary.

Sixth, about broadband

Broadband technology has been used more frequently in recent years, due to the emergence of DVD-A and SACD audio and video programming sources. Both of these require higher requirements for conventional audio equipment due to better audio output metrics. However, as a power amplifier, especially a transistor power amplifier, it is actually able to meet this requirement in technology and technology. This is also the case with most domestically produced transistor power amplifiers. This is unquestionable. It is more difficult for the speaker to exceed the high frequency of 20kHz. Now we can see that some speakers have a high frequency cut-off frequency of 25kHz. Compared with the power amplifier, it is really slower. Broadband will undoubtedly make the high-frequency feeling of the sound more round, transparent and delicate.

Broadband is an auxiliary function for listening, and is used to distinguish elements of musical detail. The average person does not necessarily feel the change, why is it feeling? Because the highest frequency of listening to the human ear is theoretically only 20KHz. A few years ago I tested my high-pitched listening ability at 16 kHz in a test room of a speaker manufacturing company. So a lot of higher frequencies are felt. But if you can feel it in peace, most people can still feel the changes in the sound brought by broadband equipment.

At present, the promotion of broadband is no longer in the process of technology and equipment. The key lies in the copyright of music and the richness of DVD-A and SACD discs.

Seven, about wire

For the general system, you don't have to deliberately pursue any advanced wire to compensate for the dissatisfaction of the sound. In that case, you can directly change the amplifier or the speaker more effectively. Playing the line is a matter of high-end enthusiasts, more of a play component. Just don't buy anything junk.

Disc players and amplifiers, the general digital part is similar to fiber optics or coaxial. For your system, there may be no difference, and today's urban environment family electromagnetic interference is more serious, making fiber transmission may be better. In theory, of course, the coaxial transmission is good, because there is less secondary electro-optical, optical-electrical conversion in the middle. However, the analog signal line of the disc player and the power amplifier cannot be omitted.

The speaker cable is genuine and multi-core. For families buried in the line, avoid joints in the middle. Calculate the materials before the purchase.

Video lines and digital signal lines have similar requirements. In short, don't be cheap. Madu bought it, can't he afford the saddle?

The end of the signal line is also important, not necessarily gold-plated, but the processing technology is good, the average person can judge with the naked eye, which is also good for the output port of the audio-visual equipment. Enthusiasts will of course ask for higher, and will choose the advanced end to solder themselves. The speaker cable can be directly pressed and plugged. Most homes will not change the speaker wiring back and forth, so there is no problem with direct tightening. There is no need to pay for the end. Welcome to the home theater for more details

AC power is important for both the source and the amplifier, but the average family doesn't have to be so sophisticated. If it is specially equipped for your own sound system, the power system, starting from the inlet, the thicker the buried wire, the better, because the average supply current of the sound system is not large, but the dynamic is very large, the thicker the line, the better the music is better. Original feature. The power system is also the interface, the fewer joints, and the least possible to remove. Sockets, don't use the kind of cheap things. Now some manufacturers of audio coils have started to produce special sockets that everyone can buy, such as Foshan's and domain-produced, built-in filters, which can satisfy most people. Need. For high-power amplifiers, high-demand enthusiasts, it is recommended not to plug in the socket board with filter, it may be better to directly connect to AC power.
Eight, about multi-room listening

The design and construction of a multi-room listening is very sloppy, but it is impossible to have a large investment in family conditions, so it can only be simplified. It is generally recommended to buy a mini stereo directly in the bedroom, study, etc. To share the audio and video program source, the audio and video signal lines need to be taken out from the disc player or the AV amplifier, and it is generally necessary to embed the line. It should be noted that the more the number of signal lines that are drawn, the more troublesome the link, and the longer the line, the more the signal is lost. This usually has to be handled separately, and you need to buy a multi-channel interface (which should be available on the market) to convert. At this time, the signal line should be made by itself in most cases. It is best to weld the joints to people with high welding level. Fortunately, some of the ends are not welded, and the ends are screwed. If you can buy this. The class end is the best, but the enthusiast still likes the end of the solder.

Nine, on the concept of consumption

Most people know that there is no good goods at a cheap price, one penny for one item, but in practice, people tend to be price-dominated, so there will be problems like this. If you have problems, you should calm down and learn to comfort yourself. The sound is for us. Pleasant, not to make me angry, hehe.

The sound is first of all the merchandise, then the special sensory supplies, don't forget this in the "fever". The effect is closely related to the grade and positioning of the product. Of course, there is no use of the value of the high-end audio products, basically bought a reputation. This topic seems to be unclear, I just mentioned it briefly.

Finally, the power illustrates that in the future, multi-channel replacement of stereo is inevitable. Although the cost of an excellent multi-channel system is higher, it is inevitable. So if you are investing once, this question hopes to draw your attention. The problem of the investment ratio between the power amplifier and the speaker system is indeed a matter of opinion. It has always been unclear. For a system that buys around 5,000 yuan, it is certainly not necessary to consider this problem. For systems with more than 10,000 yuan, the investment of amplifiers and speakers is quite suitable. I think that the number of pieces of the speaker system is more, and it is normal for the speaker to invest a little more.

X. About mail order and online shopping

This is a sensitive topic, but it cannot be avoided. I believe that with the establishment of the concept of market economy, most practitioners will pay attention to credibility. I don't appreciate the concept of suspicion of everything. The people and things that are abducted are but few. I personally began to mail the components of the fever from the early 1980s, probably no more than a hundred times, only once did not receive the item, several times not satisfied with the item but not all blame the business. For mail order, I think there is someone who needs it.

Of course, mail order or online shopping, you must confirm the model and style and price in advance, large items such as amplifiers and speakers are also best to discuss the damage compensation, in most cases the chance of damage is small. I checked the amp speaker for a number of times without damage.

Regarding the reputation of the merchants, the market economy will develop much earlier in the south of the Yangtze River. Most of the furniture has a long-term vision. The merchants should be careful to the north of the Yangtze River. To understand the relevant comments, especially Henan and Hebei. Shanxi and other provinces (don't kick me) should be careful.

XI, the importance of the video link

Because of the advancement of technology and the reduction of commodity costs, the video link that was not valued in the home audio and video system has been rapidly developed. LCDs, plasmas, projectors, and other high-priced video displays are entering the home, in order to show this trend. And guide people to pay attention to the gradual home audio and video system, our forum uses video projection as an independent sub-forum, the video evaluation and measurement is relatively difficult, especially the horizontal comparison is quite difficult, so this requires more friends will Introduce your own experience to everyone. Some have just entered our consumption plan, but this will be an increasingly hot part of the audio and video system. Welcome to the home theater for more details

With the increase in the number of members here, with the increase in the number of people with equipment, more and more problems with system debugging, setup, placement, environment, and even power systems have become more and more recent. This is undoubtedly a A happy thing!

In fact, the environment of the listening room, including the structure and interior decoration materials, plays a considerable role in the whole listening experience. In the past, it was not so emphasized, because it was afraid to scare everyone away. Good guys are so complicated and complicated, forget it, don't play! Because of the national conditions and the ability to consume, most of my friends will still use the funds on the cutting edge, that is, the input of equipment. But the environment is really important, especially for those who are particularly picky about sound effects, especially perfectionists like me. If there are no obvious mistakes in equipment purchase and matching, if the effect is not good, you should first doubt the environment and The debugging problem of the system is more important for the system above the mid-range.

In terms of the environment, it is mainly necessary to improve the interference of the corners of the room for sound, and try to avoid right angles!

When the environment can't make big adjustments, the speaker position is that we can make a fuss and usually have surprises. We need to play with it repeatedly, don't be bothered, and may even bring some troubles and changes to the home life. It is a matter of choice and compromise.

With the increase of household electrical equipment, the mutual interference of power and sound has been felt by many friends and tried to improve with less cost.

Twelve, the development trend of audio and video

Power believes that from audio to home theater is the inevitable result of social progress and technological development. We have now felt that the development trend of stereo diversification is becoming more and more obvious. I feel that our forum is obliged to lead this trend. The combination of audio-visual systems and digital TV, network video and computer systems, constitute a diversified, three-dimensional, intelligent home entertainment system, I think it will be a development trend, this trend is the development of home theater trends, at the same time, Personalized and simplified audio-visual entertainment trends are also emerging. Of course, in this development trend, there are still friends who are fascinated by the stereo system. This is for sure, but for most of the friends, it is inevitable to catch up with the audio-visual technology and enjoy the results brought by audio-visual technology.

Power wishes every friend who has just stepped into the sound door can build a satisfactory sound system with the help of the home theater technology website and the new audio-visual forum.

It is also necessary to note that the forum is a completely open platform. Everyone has it. Anything is said. It can be said that it is a microcosm of society. Generally, as long as we do not violate some basic rules and destroy the order here, we have no power to go. Intervention, so visiting the forum must have this ability to withstand.

I also hope that everyone is happy here! thank you all!

The power is too small to complete the first edition on October 5, 2003.

Added on October 18, 2004:

The principle of matching home theater systems

1, the combination of power amplifier and speaker

The combination of amplifier and speaker involves two aspects: tone matching and power matching.

The first element of the combination of the amplifier and the speaker should be the matching of features. This is very confused for novices. At present, the power amplifiers and sounds of many famous brands at home and abroad have relatively distinctive features or characteristics, and each has its own consumer group. Because of this, matching different combinations often brings different benefits. Many newcomers want the forum to give a unified collocation scheme. If the forum does this, it will be irresponsible because everyone's needs and preferences for sound are different. About feature matching, it is necessary to understand the old post or look at the articles of professional magazines. This is a gradual process and cannot be rushed for success.

The power matching involves the sensitivity of the speaker and the room size and sound pressure. Because the change in power indicator is very obvious for the cost of the power amplifier, most people choose the power amplifier is also limited by the total investment. So this is usually a hard-to-find end answer. The room is bigger, the listening environment is better, and the sound pressure of the system can be expected to be higher, because the replay music is a dynamic and large restoration process, and only a large sound pressure reproduction environment can make us get more music. Large sound pressures need to be matched with higher power amplifiers. At the same time, the final sound pressure is achieved by the speaker, which involves the sensitivity of the speaker, that is, the efficiency problem. The sensitivity of common speakers is about 87-89dB. In recent years, many speakers have reached the level of 90, 91. This all says that the sensitivity is normal. If the sensitivity is lower than 87, then obtaining the same sound pressure requires that the rated output power of the amplifier will be greatly increased. Regarding the rated output power of the power amplifier, it is also necessary to distinguish the difference between the transistor power amplifier and the tube power amplifier. Because of the transistor's own characteristics, when the transistor works close to the rated output, the distortion increases almost linearly. Usually, the power requirement of the high-system configuration transistor power amplifier is relatively large, and the enthusiasts even have 5 times and 10 times. This is not necessary for tube amps, because the tube amplifier is placed very close to the rated output and the distortion rises very smoothly, so the power headroom of the tube amp configuration can generally be small. However, in the cost structure of the power amplifier, the rated power largely determines the cost of the power amplifier. The greater the power, the higher the cost. Because most of my friends' budgets are rated, this affects the strict requirements of matching amplifiers. This is a compromise.

2, the home theater requirements for the speaker

In accordance with the requirements of the specification, except for the 0.1-channel subwoofer, the other 5, 6 and 7 speakers are the same characteristic index and sound characteristics. It is generally recommended to purchase the same brand of the same brand of speaker. Although the same series of the same series of speaker sets have moved to the needs of the speaker placement, but the regular manufacturers generally consider the requirements of the digital cinema system for each channel system speaker.

If limited by budget, many people know the importance of the purchase of the center speaker in the home theater system. Therefore, the standard home theater system, the center speaker can not be ignored.

3, decoding system

If we only want to watch DVDs, the decoder only needs to support mainstream DD/DTS. Others actually say something to embellish and singularly. If it is a super music lover, remove CD, DVD-A, SACD is a good solution.

4, about the placement of the speaker

Take the basic 5.1CH system as an example. The front left and right channel speakers are generally called the main speakers. They are usually placed on the left and right sides of the front main unit. The center speaker should be placed on the same horizontal surface of the screen. The vocal dialogue and midfield positioning are integrated with the screen, but it is difficult to achieve under normal circumstances, and it also involves the aesthetic problem of placement. Therefore, most of the center speaker design is placed on the TV, along with the projector. The entry of high-end display devices such as plasma into the home, the placement of the center speaker can return to its original position, and should be placed on the same level as the screen or the viewer's ear. The rear surround speakers can be placed on the left and right sides of the listener, or on the left and right sides of the listener, which can be compromised by installing the room. However, the surround sound of the surround speaker faces the listener or faces a little in front of the listener. Surround speakers If you install brackets or suspension, the height should not be 50-80CM. There are some better surround speakers in the market that use dipole design, which has the best surround sound field diffusion effect.

To play the subwoofer, you need to debug it carefully and see where it works best in the room.

Regarding the placement of the speakers, it should be noted that the walls and corners should not be too close, at least a distance of 15 cm or more. If the room is small, pay attention to the anti-magnetic problem of the center speaker or even the main speaker.

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