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Five steps to perfect the sound quality of home audio comparable to cinema

2021-03-29 481
For the general public, the audio-visual effects enjoyed in home theaters are really inferior to professional theaters. So what causes it? First of all, the quality of the equipment occupies a large part, and the environment and film sources cause huge differences between the theater and the home. For professional audio-visual enthusiasts, how can the home professional audio system be comparable to the professional theater? In terms of the quality of similar products, how to build a beautiful digital audio-visual room? The following is an analysis for you one by one starting from the purchase:

Shopping articles
Innate factors are very important: Speaking of household sound, it is really "three points depend on use, seven points depend on selection". After all, we are not a master of DIY sound, we are more about buying ready-made products, and products are usually pre-manufactured and packaged by manufacturers, so how to choose and configure a sound with good "innate physique" is our first priority. To do.

Ordinary home sound system can be divided into three parts: sound source, power amplifier and sound unit. As a home speaker, the audio source can be a common disc player or a professional CD player. Normally we do not recommend the use of MD players. Although the sound quality of MD is not much different from that of CDs from an auditory point of view, the sound of MD is a product that has been transcribed after compression. The volume of music is more than half smaller than that of CD. Naturally, there will be losses, and there is still a difference from the most original CD player and DVD player. If you choose a DVD player, the 5.1-channel jack on the back is indispensable. Dolby AC-3 decoding and DTS decoding should also be supported. Do not choose products with built-in amplifiers.

The choice of power amplifier is certainly important, but an important criterion is that power amplifiers and speakers should try to achieve "power matching and impedance matching". Simply put, the power amplifier and speakers are the relationship between the horse and the car. Whether it is a "big horse-drawn cart" or a "small horse-drawn cart", it will seriously affect the efficiency of the system and even damage the system components. Therefore, the matching criterion is the first thing to do of. Otherwise, the speaker system will either appear weak and dry, or it will appear hoarse.

In addition to pure music power amplifiers, AV power amplifiers are more power amplifiers used for home sound or home theater. However, since the power amplifiers of all speaker units are concentrated here, the performance in different ranges of high, medium, and low will be limited, depending on what kind of tone you value more. In general, we recommend that the larger output power of the power amplifier is 1.5 times the rated power of the speaker, and the multiple of the bass is requested to be higher. However, do not use the power amplifier to "find" the speakers. The speakers can be said to be the most important part of the sound. After all, the "voice" of the entire system is in it, and the slightest difference in texture will directly affect the final sound quality. Therefore, we are more advocating to choose the speakers first and then set the power amplifier.

At present, the speaker products on the market are mainly composed of two parts: a unit and a cabinet. According to the composition, they are divided into a tweeter, a midrange unit, a woofer, and a subwoofer. The cabinet is the part of the speaker that we see and touch first. Technically speaking, wooden cabinets have better sound effects than other materials, and solid wood cabinets are the top grade among wooden cabinets. When choosing the cabinet, we can feel the sound and texture of the cabinet board through knocking and moving. The ordinary sound is clean and loud, and the sound effect of the heavy-handed cabinet is better. The quality of the pronunciation unit depends on the skills of each manufacturer.

Five steps to perfect the sound quality of home audio comparable to cinema

However, it is worth noting that the local silk film tweeters and metal diaphragm tweeters have better expressiveness in the tweeter, the sound is clear and pleasant, and the transient response is good, which can effectively enhance the transparency and penetration of the high-pitched audio. As for the mid-bass unit, paper diaphragm or canvas diaphragm can be used. Due to the greater elasticity of the material, the sound produced is thicker and more flexible. When purchasing a mid-woofer, especially a woofer, pay attention to the flexible connection between the edge of the diaphragm and the bracket. The material is secondary. The key is to knock and touch to see if the diaphragm is adequate on the bracket. Vibrate the space. Especially for the woofer, if the vibration amplitude is small, the diaphragm stroke is relatively small, and the strength and flexibility of the bass will be greatly reduced.

Audition articles
Be sure to listen to genuine discs: Many people think that CDs are digital media. Even if they are pirated, the quality of the music will not be greatly lost, but the price is much lower. Therefore, they buy pirated CDs to "enrich" their "fever" discs. Library.
In fact, pirated CDs are really something you can't use. Since it is not copied from the master disc, pirated discs usually have missing codes or wrong codes. Moreover, due to the rough manufacturing, the sound recovered from the sound is far less real than the original disc. Some missing codes can be heard by the ears of the application sound system. It is obvious that the midrange is pale, and the high and low ranges are rough and stiff. Not only do they not enjoy it, but they become more anxious. By the way, some people may ask: Then I buy pirated discs and listen to popular music assemblies, right? This option is still feasible when you don't worry about the CD player or player burning out the head. In fact, Xiao Zhu feels that buying pirated music is not only a record player, but also the original sound quality is not available. It is not as easy to listen to MP3 at a certain level.

The planning of the listening room: The listening room is a "singing room" for domestic sound. It is said to be a listening room, but it is actually just a room in our residence, but why do we call it a listening room? Because it is different from other rooms, special renovations were stopped for listening.
First of all, a large space is of great benefit to the spread and extension of sound, so we propose to choose the listening room in a room of 15 square meters or more. The height of the room should not be too large. First, the cost of the sound-absorbing material is higher, and secondly, the sound diffusion in a higher space is likely to cause undesirable reverberation.
Secondly, the listening room should choose a location that is neither noisy nor disturbed by noise to prevent noise from affecting the listening effect. Thirdly, sound-absorbing materials must be installed, usually thick curtains, tapestries, and bookshelves can also play a sound-absorbing effect. But do not have too thick sound-absorbing layer, too thick sound-absorbing layer will make the reverberation effect seriously drop, just like listening to the sound in the prairie, the sound will not return. Not only is the sound dull and boring, but it also has a bad influence on the sound field positioning. Speaking of this, we must mention the role of tapestry. The tapestry is both a decoration and a sound-absorbing layer. Not only is it beautiful and suitable, but it can be interchanged at any time according to the fullness of the sound we feel.
In addition, the structure of the room and the internal furnishings should not be too symmetrical, otherwise the standing wave and resonance of the sound in the local frequency band will be easily formed in the room, which will destroy the balanced sound proportion in the sound field. Placement —— Repeated attempts to create a sound field. The sound of moving home is not just a "POSE" and everything will be fine. Even the woofer, 5.1 channels and 6 speakers should have their own positions. The center speaker is usually the main force of the human voice, so its role cannot be ignored. Generally speaking, the center speaker is better placed in front of the visual center of the listening room, for example, above the TV. However, due to the mutual influence between the speaker magnet cylinder and the TV magnetic field, as well as the vibration of the speaker and the TV casing, direct placement usually produces a bad sound effect. Therefore, we suggest that the center speaker can be placed on a separate stand slightly higher than the TV, and the position should not be too high. Regarding screens such as projection screens, there are no front and back restrictions.
The location of the left and right main speakers needs to be symmetrically planned on both sides of the center speakers, not too close to each other, and the distance between the front and back of the center speakers is better, and the listening position is the center of the arc shape. The up and down position is preferably 0.3 meters above and below the center line of the main speaker's mid-tweeter unit. Similar to placing it directly on the ground or on the ceiling will cause the midrange position to deviate from a better angle, making people feel that the sound field is disordered. If you are using bookshelf speakers, it is better to install the bracket without a speaker cabinet to ensure that the height of the speakers is moderate. The function of surround speakers is mostly to create the diffusion and breadth of the sound field, so it is more suitable to be placed about half a meter away from the top. The presented sound field needs to be adjusted according to your personal feelings. Due to the low directivity of the bass, there is generally no hard requirement for the placement of the woofer. If you are not a professional enthusiast, the location of the woofer only needs to be out of the way.

Acoustic running-in needs are step-by-step: the use of sound is the same as that of a car, and the running-in period is also required, especially for newly purchased acoustic systems. In the initial stage of use, do not use it as a karaoke room speaker. Turn the sound louder at once. We recommend that you control the volume at about a quarter of the larger output in the initial use. After 72 hours of use After that, the output can be appropriately increased to about one-half. Usually we do not recommend that you turn the volume up to more than two-thirds and stop using it. When the volume is too loud, it will not only break through the better output state of the rated power of the pronunciation unit, but also the excessively strong sound field will not be conducive to the positioning and performance of various timbres and musical instruments. It can only sound like a mess, except for the shocking momentum. There is no sense of beauty.
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