1. What is a home theater?
Home theater is a great way to watch a large video system at home without going out, and it will outperform most ordinary cinemas that are limited by operations and professionalism. Of course, the premise is that your theater must meet at least the minimum requirements of THX or acoustic principles!
1. What is the display device? At least your home (television, projection) should reach the same resolution as the currently released mainstream disc (current Blu-ray disc), for example, currently 1080P3D;
2. What is the playback device? On the playback device, first of all, you must have a playback device that can play full HD, such as high-definition, Blu-ray, set-top, and various network boxes, and require audio to output at least the lowest format of true 5.1 ( DTS, AC3). It is best to play the Blu-ray original and output the next generation audio track (DTSHD, TrueHD).
3. What is the cinema multi-channel 5.1? The stereo analog before the VCD era was called 5.0 to Dolby decoding. There was no gun at that time, nor was it true independent 6-channel positioning (5.1=5+1), starting from the appearance of DVD. With the dual decoding technology of DTS and AC3, there are 6 independent audio tracks in the film, which realizes the independent positioning of the cinematic effect. The theater really begins to have a real and realistic experience and uses Up to now (China's good voice and other programs with high sound requirements have begun to record and transmit with this technology)
China Good Voice Dolby 5.1 Production Team
4, now the source is Blu-ray, what is the current multi-channel audio format? DTS and AC3 dual decoding is the previous generation of 5.1 production technology, DVD developed to the present, called Blu-ray DVD, naturally accompanied by increased disc capacity Not only has the resolution reached 1080P full HD, but the audio has also been greatly improved. So now the mainstream and commercial use of the next generation audio decoding (DTSHD, TrueHD) is the highest number of channels. 7.1.
THX Certified Movie Mixing Studio
The latest Dolby Atmos and DTS.X, which generate real-time 64-channel channels based on sound objects, are also beginning to be early adopters or upcoming!
Britain's first Pinewood Post remix shed equipped with Dolby Atmos
4. How to express the independent multi-channel sound of real 5.1 or 7.1? Understand what is multi-channel, it is natural to select the power amplifier and corresponding channel configuration that can decode these multi-channels on the decoding device. If you want to experience the independent 3D positioning sound of 5.1 or 7.1 in the theater, the corresponding box for each channel is indispensable. Like those SoundBars, there is no surround channel at all, this is only a TV companion at most! And like the panoramic Atmos, you need 4 overhead sky channels, not to mention.
Second, why do you need a home theater?
If you have a need, you want to have it:
1. At the content level, domestic theaters are managed by the State Administration of Radio, Film and Television, and foreign content introduction is different. Foreign countries are free to purchase contracts from film companies. Tianchao is a limited importer of 30 or 40 films. Per year!
And the celestial dynasty will put all the so-called violent, bloody, pornographic and other highlights to the spotting point (all know the new version of Wu Zetian). People who have foreign friends know that the happiest thing for foreigners in China is to see what film they want. Look at what film, whether you are at home or go to the theater abroad, it will cost about 10 euros!
2, the effect level, the provincial city is okay, equipment, technology, each theater will have a handy hall equipped with Atmos, 4K dual-machine, Auro11.1, China giant screen, IMAX.
However, almost 90% of the operating costs are still in the ordinary 7.1, the audio configuration is too low, the projection lumen is insufficient. In general, as long as the theater system that meets the minimum equipment requirements of the home theater plus professional debugging, it can easily exceed these so-called commercial cinema halls.
3, Convenient level, the Chinese people's life pressure is relatively large, so it is difficult to save every week to go to the cinema to see a few big movies, even if it is going, there are also travel, parking, buying tickets and many other time consumption, a film is 1- 2 hours, if you are at home, you have already seen it for a little while. Not to mention "fox friends", "wife and children", "free posture", and other scenarios... Source, (Download, Copy, 6 money, a Blu-ray disc) You know!
3. What are the components of the theater?
1. Source: It is the source of the program. Generally, there are Blu-ray DVD, HD player, computer (HTPC), PS3, various set-top boxes, various network HD boxes, etc., and AV amplifier (home theater). The amplifier has 4 HDMI inputs, 6-7 mid-range, and more high-end. So these devices can be connected in part by HDMI at the same time. You can select one as the current playback by one-touch switch on the amplifier. source.
The first standard of the theater is generally based on the digital program carrier. For example, the current mainstream commercial program carrier has a frequency resolution of 1080P on the Blu-ray disc (BD25G and BD50G), and the audio is up to the next generation DTSHD or TrueHD, the number of tracks on each disc is different, there are many, some less, not a certain, but in general, buy a disc to buy at least a Blu-ray disc with a next-generation audio track. In addition to playing the disc, Blu-ray machines can also be copied to the Blu-ray original disc on the hard disk. This is especially important for the big cards that cannot be jailbroken. It is absolutely impossible to buy, because only the genuine, free-spirited local tyrants do not matter. . Then the format of the compatible audio and video files of each brand is also different. When you buy it, you should also check which one you mainly download.
HD player, it can be said that there is no Blu-ray player Blu-ray player, mainly to play files on the hard disk, most of the formats can be played, and some also have a network HD box function. Then there is the computer. Nowadays, almost all notebooks have HDMI interface. They all support full HD 1080P, 3D, next generation output, so it can also be used as a source. It is omnipotent, but it is slightly difficult to use. No player can take it all. PS3 jailbreak can put blue light, the Blu-ray original disk on the hard disk can not be placed uncertain, various set-top boxes with HDMI output can also be used as an input source to the amplifier. Network boxes such as millet are like a lot of things. They are not based on effects, but are based on rich content. They generally do not support 3D and next-generation audio. They can play and output compressed DTS and AC3 for 20 years. The first 5.1 audio.
2, with the source, there are pieces, what kind of equipment is needed to play back, what is the composition of the audio equipment?
Amplifier part: 20 years ago, the dual decoding technology (DTS, AC3) accompanying DVD has realized the true independent channel positioning effect of 5.1. The next generation (DTSHD, TrueHD) is the larger capacity with the appearance of Blu-ray HD. Compressed multi-channel, and in the existing discs up to 7.1 a total of 8 channels of audio multi-channel encoding technology, and the current transmission method is unified into HDMI audio and video first-line. If you want to play back these multi-channel effects normally, you need a home theater decoding power amplifier that supports the above encoding format, also called AV power amplifier. According to the principle of compatibility with the low version of the high version, the latest next-generation AV amplifier is compatible with all previous decoding methods, while the old dual decoding (DTS\AC3) amplifier cannot decode the next generation, but in the next generation format. They will also carry the previous generation of double-decoded data packets, present 5.1 in a compromised manner, and transmit digital signals in a fiber-coaxial manner. Special attention should be paid to the fact that many players also support the next generation. This is easy to confuse. The real meaning is that it supports the output of the next generation source code, not that he has the decoding ability. At present, the popular amplifiers are mainly Japanese Dragon, Onkyo, Marantz, Pioneer, and Yamaha. . . For many, there are Tianyi in China, and a small amount of Harman Kardon. Basically, there are not many choices, and you can choose the thrust and style of the box.
Speaker part: The speaker is a matter of special industry. It is difficult to make a revolutionary breakthrough in decades. Many series of colorful speakers may change their appearance, and small optimization can be sold for 20 years. For example, JBL's high-end and monitor, 20 years has been the unit of the same series of paper cones, this enchantment is very difficult to break through. And some brands, because the later products can not surpass the current, but also to hang up, such as the British variety of dragons, treble can not make beyond the original copper film. In short, the brand of the speaker is still quite a lot. More than 30 years of focusing on the speaker, the roots of the seedlings, the pure and popular brand of the popular, there are dozens of hundreds, mainly concentrated in Europe and America. In terms of Japanese, most of them are temporary cards, and they are not focused on this. There are also a small number of brands in China, and they are used less. And the appliance store that is equipped with the plastic gadgets of the TV set, the power amplifier speaker machine, 100% of the purely belong to the theater's edge ball, at most, it is to enhance the TV speaker's horrible sound, at most, the TV companion. If you want to play a theater, you can ignore it.
The theater box is basically a passive box, that is, there is no need to connect the power supply, and the power amplifier is directly driven. The subwoofer is generally active because of the huge power demand and the power amplifier being unable to bear. The development of the subwoofer is accompanied by the wide application of the theater, so in addition to the old brand of the speaker, there are some new special subwoofer brands, focusing on the subwoofer, which can also be considered.
The experience should pay special attention to the 30-year-old world-class speaker, but also pay attention to his most advanced sub-cinema set, which is not up to standard in any theater standard in the world. The typical feature is: plastic one. Molded boxes, speakers 3 inches and below, guns 8 inches or less.
For example, in Boston: 3.5-inch box vs. 2.5-inch: 2.5-inch 5.1 satellite is said to be useless. The dive instrument measured only 200HZ, while the low frequency is higher than 120HZ, the directionality will be heard, and the subwoofer will not be able to. Stealth to connect the box, Imagine you look at a film, always feel like a person lying in the position of the subwoofer on the ground, is it a feeling?
The same applies to the 2.5 inch speaker 8 inch gun klipsch / Jasper HDTheater600 HDT600, Harman Kardon HKTS60 8 inch gun plastic box, JBL CINEMA610, etc., the brand is big, not necessarily every standard.
In addition, the world's big-name speakers generally have a longer life than dog life, so the quality problem is more reliable, and there is no problem with the digital product port replacement, of course, if it is bought as a home decoration, clothes rail, feng shui placement Then it is another matter.
3, the audio is finished, naturally there are display devices at the end, the current main body is two, one is a TV, one is a projector, the general living room, there are two kinds, the TV mainly look at the sky The program, while the projection mainly looks at the high quality of American blockbusters and concerts. A heavy content, a heavy experience.
The TV is now almost full HD 1080P, and there are a lot of 4K, in addition to look at the roast duck, basically no other eggs. And the depreciation speed of digital products is quite fast. When the 4K is really popular, the machine of 3 or 5 years ago can't keep up with it. Therefore, if you choose TV, 4K is of little significance. It is better to choose a 1080P with stronger and more mature effects.
TV is naturally projection, now the home projection is 1080P3D, 5,6 thousand in the entry can get a pretty good entry machine, if you open Kochi Haitao mode on Nichia, there will be more provinces 1- 2 thousand money plus a reliable projection screen can be live together, the curtain should try to be as reliable as possible foreign civilians, because this thing is money, money, and money. .
Fourth, the home theater can be connected to the normal effect? ​​Which aspects can make your effect possible to deal with less than 50%?
The effect of buying each theater is the effect, but for ordinary people, the effect comes from: 3 points by space + 4 points by equipment + 3 points by the balance of debugging without short board barrel effect. For enthusiasts, the following include equipment balance, space matching, power supply, professional debugging, good vibration isolation, just the right wire, and so on.
1. The space is different and the effect is very different;
Home theater is naturally placed in the family space, and the impact of space on the effect is enormous.
If the acoustics are too academic, then this example is believed to resonate: you speak in the underground parking lot and say outdoors, which one is clearer?
And the space of the family room is also space, is there such a problem? It’s just different in size and the degree of impact is different.
There are two kinds of home theaters in general, living room theaters and independent audio-visual rooms, while living room theaters are the majority, becoming the multimedia and audio-visual entertainment center for most families. But because of the spatial structure and the unintentional (for example, some living rooms are leather soft wall, overhead solid wood flooring, a large number of curtains, fabric or leather sofas, carpet tiles), how much the acoustic treatment is different, even if it is completely the same equipment, the effect is It may be completely different.
And the leading audio-visual and growing world is the independent audio-visual room (have to say that every big boy has an idol in the American cartoons and blockbusters, there is a cinema dream), not to be generous, Just ask for depth. On the independent audio-visual room side, there is a need to bring together the acoustic design of the home theater, including the international design of acoustic design, equipment balance, beautiful decoration, strong power supply, professional debugging, good vibration isolation, and the most complete and strongest technical level in the wire.
2. Equipment equalization
In terms of equipment balance, there are two iron laws: First, whether it is THX or HAA, any audio and video specification in the world defines a pure theater. The middle position cannot be weaker than any box in the theater. 2. The ultra-low frequency The power is more than 80% of the entire theater system.
The interpretation is that, in terms of the box, if it is to be used for pure home theater use, the center must be the best and highest specification box of all the boxes in the theater. For example, THX Home's highest certified THX Ultra II certified theater box, each box is the same, or the same specifications. No matter what the main box and center. And on the box, there is also a requirement that the low frequency has no directionality. As the frequency increases, the directionality becomes more and more clear. Scientific research proves that if the frequency exceeds 120HZ, there will be obvious directionality that can be detected, so the box can be played back. The lower limit frequency cannot be higher than 120HZ, and THX requires the authentication system to require the lower limit frequency of the box not to be higher than 80HZ. The intuitive judgment is that if the box is too small (2, 3 inches), it should be noted that it may not meet the minimum requirements of the theater.
In terms of ultra-low frequency, the theater, especially the American blockbuster, a large number of heroism, save humanity, save the earth, fight evil, save the universe, and open the brain. . . Naturally, there are incomparably many firestorm scenes, a large number of explosions, and ultra-low frequency sound effects of fighting. The power of the ultra-low frequency point is more than 80% of the whole system, and the current theater home theater amplifier with the Japanese AV merged face is no name, the virtual standard 3 times the power is unable to bear the burden of the ultra-low frequency, and Hard 扛 will greatly increase the distortion and loss of control in the mid-high frequency band. Therefore, the most important solution is the active subwoofer. For better and less distortion and more control, the AV amplifier will not amplify the signal of the subwoofer without any exception. The signal is output to the active subwoofer with its own power amplification to afford. In this way, 80% of the power burden of the theater is solved by the subwoofer. The amplifier can more easily control the playback of each box.
So in the home theater, the subwoofer is the soul of the entire system. Whether the effect can come out and whether it will disturb the people is the key factor. A good cannon can be thick and thin, and the volume of the Ipad can be used to output the atmosphere and pressure of the American blockbuster. When watching the blockbuster, the family can exchange and chat, and it is impossible to disturb the people. The nuisance of the people is that they do not feel the pressure of the gas field and there is no shock, and it is caused by the loud volume that can't help but open. Of course, if the volume of family chats is disturbing, then it is necessary to consider whether the building meets the minimum requirements for the privacy of the country's civil buildings.
3. The effect is 4-5 percent, or 7-8 percent, the success or failure in this move, the final big move - debugging!
In addition to grabbing various spaces such as echo time (professional called reverberation time) and noise level, debugging is more about debugging the uniformity of the sound field to make the best state of the device in this space. . The weight of the debugging is heavy, it is the position of the subwoofer. What is the importance of it? Some living rooms have different positions on the left and right, the effect is different from the sky and the ground, and even some of the ceiling resonances are different. For enthusiasts and professionals. Generally we call the low frequency standing wave. Some people will say that the current low-end amps have automatic test MICs, but ask a question, can the amplifier help you find the best gun position, this is the most critical problem in debugging, and almost The distance of the subwoofer is not measured. )
It is difficult to explain the scientific principle to the low-frequency standing wave. It is easier to understand with such an example: a fast same stone, the same position and posture thrown into a small water tank (for example, 1 meter in diameter), and a pond In the middle (for example, 20 meters in diameter), which one of the water will sway more intensely? This is the wave acoustics unique to small space acoustics! The ultra-low frequency emitted by the subwoofer is uneven in space, and the meaning of debugging is to let The low frequency of the listening area is relatively balanced. If there is a strong standing wave, in addition to the possibility of disturbing the people, the ceiling or the cabinet will have a strong resonance noise, the physiological problems may cause nausea, vomiting, dizziness like motion sickness. Wait, it is also the main reason why many local tyrants' steel slate audio-visual rooms can only be used for display. In general, the effect is almost inferior, the key is that if this thing is not handled well, there will be physical discomfort. More fresh and fun home theater information, please pay attention to home theater network (WeChat: cnhifi) http://, the country's most influential home theater audio player interactive media website.
Note: This article is transferred from the online forum, the author "Chengdu Xiaochun", the article is the author's independent point of view, does not represent the position of the home theater network.
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