The sound reproduction of audio equipment has a very close relationship with the acoustic characteristics of the building environment. In order to maximize the performance of the sound system, the listening room must be acoustically treated.
There are four aspects to consider for the architectural acoustic characteristics of the listening room, 1 reverberation time, 2 diffusion characteristics of reverberation attenuation, frequency characteristics of 3 rooms, and 4 ambient noise levels.
The acoustic characteristics of the building in the listening room vary, and the reflection and absorption of sound by different objects are also different. Therefore, the acoustic processing to improve the listening environment and the improvement of acoustic defects are very complicated. Whenever possible, it is best to avoid the size of any two sides of the room being equal, or one side that is exactly twice the other side, that is, a room with a square or aspect ratio, because this ratio of room will produce standing waves, low frequency acoustic resonance. , causing sound staining.
The sound formed by the repeated reflection of walls, ceilings, floors, furniture and people in the room continues to fading and is gradually attenuated, called reverberation (also known as reverberation). It is different from echo, which is not a smooth decay but a sudden return of sound. For the most important indicator of room acoustics, the first is the reverberation time, which is the time required for the attenuation of sound energy to drop to one millionth (60dB) of the original intensity. For a certain room, the reverberation time mainly depends on In the sound absorption process. For the reverberation time of the Hi-Fi listening room, it can take 0.4~0.5 seconds. The reverberation time is moderate, the music is full, the voice is full, the reverberation time is longer and the sound is more lively and rich, but when it is too long, the sound is easy to be ambiguous, the speech intelligibility is degraded, the tone lacks strength and rhythm, and the reverberation time is too short. The sound is harder, lacks anger, and there is no reverberant sound (such as outdoor) often with a sense of dullness.
The diffusion characteristics of the room are good, the sound attenuation is smooth, and the sound throughout the room feels even. Any convex surface has the ability to diffuse sound waves, including bevels, curved surfaces, and convex arc surfaces. When the diffuse acoustic wave frequency is required to be convex, the diffuser can be used for processing.
When a certain frequency in the sound is excessively strengthened or weakened for some reason, the uniformity of the sound in the room will be destroyed. This phenomenon is called sound coloration. For example, standing waves can change the original characteristics of the sound, and peaks appear in some frequency bands. The improvement is that indoor objects are placed to avoid symmetry.
The large space listening room not only helps the low frequency extension, but also makes the sound feel easier and more lively. China generally uses the room area of ​​the listening room to be about 14m2, about 2.8m high, and the volume is about 40m3. In this kind of room, as long as the acoustics are handled properly, it should be able to have a good listening effect. Since the wavelength of sound below 100 Hz is greater than 3.4 m, which is the same order of magnitude as the size of the room, only a few resonant frequencies can be generated in its space, and the low-frequency sound waves have less mutual interference, which sounds natural and round. However, the wavelengths of the medium and high frequency sounds are much smaller than the space size, and a large number of standing waves will be generated indoors. Under the mutual interference of the standing waves, the acoustic characteristics of the room at 100~500 Hz are generally poor, and the audio energy of this frequency band is very high. High, so pay attention and make appropriate treatment.
In the room between the opposite walls, standing waves are generated due to multiple reflections of the sound. When the standing wave occurs, resonance occurs. The frequency depends on the distance between the walls. The room is actually a resonator. The place where the standing waves cause the most sounding of the sound in the room is the corners of the two sides of the back wall of the speaker, which will reflect the unclean bass. This effect is called room booming. This low frequency standing wave is a common acoustic defect that causes the bass clarity to drop and requires careful handling. A good way to control standing wave reflection is to use a bookshelf full of books, the irregular shape of the book and the less powerful sound absorption to scatter the sound waves, thus reducing the effects of sound reflection. Marble and granite floors and floor-to-ceiling glass are the first choice for modern home improvement, but they are the enemy of sound effects. Frequently, the sound is blurred and noisy. The method of improvement is to place a properly sized carpet in front of the speaker and a thick curtain in front of the glass.
The ambient noise level refers to the noise sound pressure level when there is no sound source in the room. If the ambient noise is too high, sound insulation, vibration isolation, etc. may be adopted, or a certain sound absorbing material may be laid indoors. The sound insulation of the current living room is usually not enough, and the sound insulation of the solid wall is the best in the whole room, and the sound insulation of the door and the window is the weakest, so the important factors determining the sound quality of the room interval are the door and the window. Home theater network shopping guide network
The living room in the living room is not ideal as a listening room, because the living room is an open space, the aisle creates asymmetry in the space, and the floor-to-ceiling window causes low frequency loss. The extended space makes the sound reflection not well controlled, resulting in a sound image bias. shift. As long as there is not much furniture, the bedroom is a better choice for the listening room, because the confined space is easy to grasp the sound reflection problem.
[page] How to make the home furnishings perfect, there has never been a consistent conclusion. However, people generally agree that it should be a place where the owner can live comfortably. It should also be a place where the owner can live with peace of mind. Under the premise of satisfying the above requirements, it should also be a reflection of the owner's taste. local.
These three simple requirements seem simple, but they are not easy. In most cases, the problem is that the person who is in the office is short of money, or is too rich.
Of course, there are some lucky ones that are exceptional. These people have enough wealth and appropriate appreciative power to fully infiltrate their own ideas and tastes into their homes, to create a comfortable living space, so that they can enjoy themselves in their own world. Enjoy the fun of modern urban life.
Mr. Zhang's home <br> <br> Mr. Zhang's home near Daning Greenland Zhabei District, a rather unimpressive top six houses. (Located in the westernmost part of the whole building, why would you choose such a location, there will be a confession below) The room area is about 130 square meters, and the regular room type of the north-south, three-bedroom and one-bedroom rooms seems to be somewhat outdated. Before the renovation, Mr. Zhang did not have much confidence in this, but after careful design and careful construction and layout in the past six months, all efforts have finally paid off. In Shanghai, among his peers, this is a home that no one can imitate. It makes Mr. Zhang very gratified.
I need to explain the background of Mr. Zhang: Mr. Zhang was born in Shanghai and went to Japan to study in 1989. During this time, he worked in a well-known electrical appliance store in Akihabara, Tokyo, and later worked on audio products. Before going to Japan, Mr. Zhang was an enthusiastic radio enthusiast. Today he has upgraded to a senior high-ranking "fan". In 11 years, he has returned to Japan from more than 20 times a total of more than a million yuan of audio equipment, and now they have all been in the home of Mr. Zhang, becoming the absolute theme of the entire room can not be replaced.
Dividing space with different audio-visual functions In order to meet the needs of my own music life, Mr. Zhang changed the original three-bedroom and one-room rooms into a two-bedroom and two-room layout, and divided the space with different audio-visual functions.
Opening the door, it is a living room about 9 meters long. It is divided into two areas. The sofa is placed on the head of the entrance, the left hand is a fake fireplace, and a set of equipment for daily background music is skillfully placed. Around the fireplace. In front of the sofa is a glass coffee table with a Victor LCD projector on the coffee table, the lens is facing the other side of the living room. There is a second space in the living room. The wall is equipped with a full set of AV equipment. At the end of the window is a seemingly bland floor-to-ceiling window, but it is actually hidden. When you press the remote control, a 120-inch screen will slowly descend. Turn off the lights and the entire living room is a mini theater.
If you think that these luxurious facilities in the living room represent the whole life of Mr. Zhang's audio, it is a big mistake. Walking through the living room, pushing a thick door to the right hand, it entered the essence and center of the room. At the end of this 20-square-meter listening room, the main audio equipment brought back by Mr. Zhang from Japan - three sets of heavyweight giant speakers, push their power amplifier, CD player, decoding equipment, LP record player, boost , stylus amplifiers... They were carefully placed on a special wooden frame to maintain a good standby. The two-sided walls are also the same style of wooden frame, with a variety of small pieces of auxiliary equipment, as well as CDs and expensive vinyl compact records that Mr. Zhang has collected for many years.
The other end of the speaker was originally a balcony, which was now converted into a small room and a low-rise side with a Japanese tea set. Twist the light, smash a cup of Whisky, put a vinyl record under the Yamashita, and let the sound come out from the JBL classic 4435 speaker, a solid and soft low frequency, a swirling note... This time, it is easy to experience The atmosphere of the jazz tea room described by Haruki Murakami's novel.
From the listening room, we went back to the living room. Mr. Zhang is obviously very satisfied with his hard work, and our topic continues to revolve around the decoration style of the entire suite.
The details of the life taste may be due to the fact that the time spent in Japan is too long. Mr. Zhang’s temper is already a bit like the Japanese, and the most impressive one is the serious attitude towards the details.
In my own experience, electronic devices such as audio are often difficult to coordinate with the general style of the home, but in the suites of Mr. Zhang, they can't see their "destructive marks." The reason is that he has been thinking about the details of the processing, to reduce the "hard feeling" of the audio equipment to a minimum. He admits that the cost of decoration is not a problem, but it is overturned to consider how to design the house to meet the needs of his own fever, but also like "the place where the normal person lives." The living room is near the door, the daily living space, the equipment selection is mini size, the panel design is very simple, the color is also close to the teak color of the floor, greatly reducing their visual impact; * near the equipment on the fireplace A lot of photos of his girlfriends have the same effect. There are three large AV equipment cabinets on the other side of the living room. In order to reduce the discomfort between them and the room, the lighting is very dark, and the size of these devices is reduced as much as possible. As for the bedroom, there is no audio equipment. The explanation is that this is a pure and intimate space. At that time, there will be a most hidden Boss "leisure life" system. At present, there is no suitable equipment for the moment. Home theater network shopping guide
The attention to detail is also reflected in the decoration process: in order to achieve the effect of sound insulation, two layers of sound-absorbing cotton are laid under the floor to reduce the impact on neighbors; (when buying a house, the outermost set of the whole building is specially selected. For the sake of sound insulation, the windows in the room were all changed into double-layer vacuum plastic steel windows; the indoor doors were replaced with 50cm thickness. In order to make the sound as little as possible interfered, all the power lines have the same positive and negative trend; for a few days of wiring, people go to the scene every day to supervise, and the workers can't even eat. In order to let all the equipment make the best sound, it took a whole month and a half to put all the equipment - positioning, tuning, testing ... and strive to leave no regrets.
In Shanghai, I believe that people who have such economic strength as Mr. Zhang and are fascinated by audio equipment should not be in the minority. But it can be such a hobby that the individual's crazy hobby is so appropriate, and reveals some kind of elegant taste for life. In today's Shanghai, it may be really difficult to find. Here, money may not be the decisive factor.
To reach the realm of today, this Mr. Zhang spent time to pay for it. Who will spend 10 years collecting audio equipment, and at the same time, 10 years to learn from Japanese senior audio critics, see what kind of equipment they use, what kind of music they listen to, how to arrange their own room...
It is still good for the French: taste is a process of accumulation. [page] Some people buy imported audio equipment, but the cost is huge, but it sounds not good, compared with the cheap equipment made by the "organ gun" enthusiasts. After several "authoritative" people who knew this way, they went to audition and consultation, only to know that the listening environment in the home was too bad. Improving the listening environment has become one of the important means to improve the quality of audio playback.
1. The best shape and best location for home theater and music room. The best shape is rectangular. It is ideal to make the room size as large as possible. However, due to limited living conditions, there may be a variety of unsatisfactory The shape and area of ​​the room should be noted that the left and right sides of the main speakers should be placed as symmetrical as possible indoors. The square room is not ideal, and the main speaker can be placed symmetrically around the corner. The audio equipment and audio-visual position should be at the longer ends of the room. The distance between the two main speakers should be no less than 2 meters and an isosceles triangle or an equilateral triangle with the viewing position. The front of the main speaker should be slightly turned to the inside. The glyph, the outer and the back are preferably separated from the wall by more than 0.3 meters. The height is generally higher when the tweeter is slightly higher than the height of the ears when sitting.
2. It is best to consider the use of sound absorbing materials in the decoration of the living room. It is best to use some materials with certain sound absorbing functions, such as non-woven wallpapers and wallpapers with embossed patterns. However, it should also be noted that the sound absorbing materials should not be overlaid too much, otherwise the sound will be dry and dry, lacking a round and pleasing spatial sense, and will also lose the charm of music. If the living conditions are limited, it is impossible to create a home theater or listening room. In the living room, the sound and home theater or listening environment are selected. If the study or bedroom is used as a home theater or listening environment, The effect may be greatly affected. If one side is a cement wall and the other side is a large cabinet type of furniture, it is necessary to hang one or two sound-absorbing fabric decorative paintings or tapestries on the side of the cement wall to make some acoustic compensation treatment, so that the main speaker The acoustic performance on both sides is as close as possible to symmetry. If the map is simple and easy to use, you can also receive a certain sound absorption effect by using floor curtains and carpets. In doing so, it can effectively reduce the partial reflection sound and improve the clarity of the sound, thereby improving the listening effect.
3. To fasten the doors and windows, the soundproof and anti-vibration enthusiasts all have the experience that if the sound is loud when listening to music, a certain part of the room such as doors and windows or other small objects will sizzle along with a certain frequency of music. If this kind of resonance phenomenon is to be effectively avoided, it should be noted that the indoor ceiling can not be made into a cavity type, the furniture is also less preferred, and the open cabinet furniture should be avoided, because it is actually a cavity; in an acoustic environment It is also not appropriate to place lightweight shell craft ornaments. The glass of the doors and windows (including the door glass on the furniture) must be securely installed and pay attention to the gasket at the gap. If the listening environment is facing the street or near the downtown area, the noise is too loud, and soundproofing measures should be taken. In addition to sealing the gap between the doors and windows, it is better to change the door and window glass to double layer to greatly improve the sound insulation performance. In order to minimize the vibration, you can use the "I" or "Z"-shaped speaker stand to erect the speaker. Unconditional speakers can also be placed on the low cabinet, but the low cabinet is best to be firm and firm. .
4. To use the power cord, the meter in the home should be replaced by 5 amps or more. Audio power, kitchen electricity, lighting power, air conditioning power, etc. must also set up separate lines, so as not to affect each other. If the conditions are limited, at least a dedicated line should be set up separately for the audio equipment, and it is best to use it with other household appliances at the same time. Otherwise, vacuum cleaners, hair dryers, microwave ovens, computers, air conditioners, etc. will generate electrical clutter, causing noise impact. effect. [page] The room used to enjoy the replay of music. Its listening environment largely determines the sound quality of the replay sound. The equipment is best, the environment is bad, and it is difficult to have good results, but this is often overlooked. The acoustic characteristics of the room are largely related to the interior and room layout. The shape and size of the ideal listening room should be in the golden ratio, and the three sizes (length, width, height) should not be integer multiples, so that the influence of the standing wave in the room is reduced, and the sense of hearing is improved. Secondly, it is necessary to make sound insulation, so that the inside and outside of the room will not interfere, and the sound will be diffused, and appropriate sound absorption should be provided to avoid the sound reciprocating reflection of sound waves to excite some natural frequency (normal frequency) sound interference, resulting in acoustic dyeing. However, in real life, the acoustic characteristics of the listening room are generally not ideal, so if the quality of the sound is very high, in addition to the signal source and equipment, some acoustic treatment should be taken on the room.
The sound from the sound source in the room is transmitted to the listener's ear through six channels, the direct sound of 1 speaker, the reflection of 2 floors, the reflection of 3 ceilings, the reflection of the back wall of 4 speakers, 5 The reflection of the walls on both sides, 6 the reflection of the wall behind the listener. As long as any reflection condition of the sound wave is changed, the sound changes. The intensity of the reflected sound must be appropriate.
The wall of the general room in our country is a rigid wall parallel to each other, and the height is below 3m. For a room of about 16m2, resonance is easy to occur in the low frequency band, so that the sound of a certain frequency is abnormally enhanced, causing the bass roaring and seriously affecting. The quality of the reproduced sound, which is the most common problem in home listening rooms. This kind of room resonance also makes the sound distribution of some frequencies (mainly low frequency) very uneven in space. The frequency at which the possibility of acoustic dyeing is greatest is 100 to 175 Hz, and around 250 Hz.
Acoustic treatment of the room, focusing on the side walls and ceiling. In principle, indoor sound waves should be treated more diffusely than absorbed, in order to reduce the resonance intensity, and to prevent excessive use of sound absorbing materials, so as to avoid the room's reverberation time is too short (< 0.3 seconds) to make the sound dry and not round. For the wall behind the speaker, it is best not to have a large piece of sound-absorbing material, usually no need to deal with it, brick wall or cement wall will make the sound full and full of vitality.
The side wall can evenly and appropriately set some sound absorption and diffusion materials. For example, a thick wool blanket is an excellent full-frequency sound absorbing object, and the thin carpet and the tapestry only absorb the medium and high frequency. The wooden doorless bookcase is a good sound diffuser, which is good for adjusting the low frequency. In addition, furniture such as tables, chairs, mattresses, sofas, etc. can adjust the sound transmission and can be used as an acoustic treatment. The most ideal acoustic treatment is to put a suitable diffuser on the side wall, but it is expensive and affects the appearance, which is difficult for the general family to accept. The convex arc is a good device for sound diffusion and sound absorption, and can be suitably used. In the sound absorbing process, the lower half of the wall is more important than the upper half, and can be treated with a resonant sound absorbing structure such as a perforated plate or a thin plate.
Thin carpets, curtains, tapestries, etc. mainly absorb the middle and high frequencies, and have little effect on the low frequency sound absorption. Too much use will cause the reverberation time of the medium and high frequency sounds in the room to be short, making the sound Lack of color, not bright enough. Wooden boards and other wooden boards can effectively absorb low frequencies, but there should be appropriate gaps between the walls and the walls when necessary. If necessary, place sound-absorbing materials in between. But remember not to nail a lot of splints to the wall, and don't put a lot of sound-absorbing blankets and curtains in the room. Otherwise, because the high frequency is absorbed a lot, it will cause the sound to dry, the details are reduced, and the volume is reduced. [page] placement of speakers
First, the impact of indoor acoustic environment <br> In the multi-channel audio system, currently the most representative of Dolby Pro Logic four channels, it is still the most popular multi-channel audio system. Because of the use of the surround channel Two surround speakers are used for the two surround channels, so the system requires five speakers. Since the advent of the Dolby AC-3 digital multichannel system, the discrete 5.1 channel has quickly become the new multi-channel standard for home theater.
The indoor acoustic environment has a certain influence on the indoor sound field created by the multi-channel speaker. Different room sounds have different spatial acoustic characteristics. The multi-channel sound system uses multiple speakers to represent the sound image and create a surround sound effect. This is not an easy task. If there is no ideal indoor acoustic environment to match, then the comprehensive sound effect will not be good. According to the theory of acoustic psychology, the early reflection sound of less than 1ms in the interior is delayed. Significant interference with direct sound will make the sound become more turbid, which will affect the sound image localization. The early reflection sound between 1~30ms will have less interference to the direct sound, and it will be combined with the direct sound. It helps to increase the loudness, but it may change the tone of the direct sound. As for the reflected sound after 30ms, the human ear usually thinks it is a reverberation sound. For the above reasons, we must do a good job of sound absorption and diffusion in the audio-visual room. Acoustic processing such as sound insulation, otherwise, excessive reverberation will reduce the clarity and consistency of the sound and affect the playback sound.
In order to illuminate the grand stereo field of the theater, the room for audio-visual use should not be too small. If possible, sound-absorbing materials should be added.
Second, the speaker placement <br> Under the premise of a good indoor acoustic environment, the more accurate the sound image positioning, the more realistic the sound, the more you can show the vivid effect of the sound of the sound. First look at the placement of the speakers in the theater. The picture below shows the speaker layout for each channel of the actual theater with surround sound.
The left and right channel front speakers are separated from each other by almost the same distance as the movie screen. The front speakers are usually discharged behind the movie screen, and they can pass the sound to the audience through the small gap of the screen. Therefore, this speaker can be placed at half the height of the screen. Home theater network shopping guide
The subwoofer is not necessarily placed in a symmetrical position in the front speaker cluster;
The standard theater has a lot of surround speakers, which together with the front speakers really "surround" the audience.
After referring to the above examples of speaker placement, let's go back and see how the speakers should be placed for the best sound. Here, we have to pay attention to the problem that the indoor play space we encounter may be much smaller than the real theater. Below, we will discuss the placement of three front (left, center, and right) speakers, then surround the sound box, and finally study the placement of the subwoofer.
1. Positioning of the center channel speaker <br> The front center speaker is generally placed as close as possible to the center of the image screen. The center channel speaker has the greatest influence on the sound quality of the movie dialogue, in order to ensure accurate positioning of the dialogue. The center of the screen and the sound is clear, you should use a separate speaker designed specifically for the center channel, instead of using the ordinary bookshelf speakers or speakers inside the TV.
Most of the center channel speakers use a horizontal horizontal box, the best place for the top of the TV (if you use the front projection display screen, then placed behind the screen), that should be as close as possible to the screen. If due to room space Restriction, a more economical placement scheme can be adopted, that is, no center speaker is provided. However, the working mode of the AV amplifier should be placed in the "phantom" channel mode, so that the information of the center channel is from left and right. The speaker is balanced and released, and its sound is just in the center of the screen. This is suitable for small listening rooms. Of course, it is better to set the center speaker separately.
2. Left and right channel main speakers are placed <br> These two speakers are placed in a certain relationship with the position of the center channel speaker. In order to ensure the smoothness of the left and right movement of the sound image, they should be placed on both sides of the center channel speaker, and the three speakers should be at the same distance from the position of the best listener in front of the screen. In general, the center speaker should be placed a little longer than the left and right speakers until the sound field can be completely combined to create a truly unified sound image. The distance of the back is related to the size of the space, the listening position and the speakers used, which can be determined by experiment. In addition, the vertical height of the left and right channel speakers is preferably not higher or lower than the center speaker's axis by 0.3m (preferably slightly lower), otherwise the left, middle and right three The height difference of the speakers is too large, and the front sound image gives a sound jump when it is laterally displaced. Generally, floor-standing speakers can meet the above requirements. If you use a bookshelf speaker for the left and right speakers, you should fix them on the speaker stand so that it meets the above requirements.
The distance between the left and right channel speakers leaving the screen is related to the size of the screen. If you use a large, medium-sized screen color TV in a small room, the left and right channel speakers can be placed on both sides of the screen. If the screen is small, you can make them a little further away from the screen to get a wider stereo field. But don't go too far from the screen, so as not to give people a false feeling because the sound image position is too far from the picture. From this point of view, there is a shortage of "innate" - the environment is too small. In summary, the sound directivity of the left, middle and right three-channel speakers is heavier than the diffusivity, that is, the radiation angle range of the three channels should be oriented toward the optimal listening position. This reduces the effects of reflected sound from the floor, walls and roof, and properly ensures the clarity of the sound image.
3. Surround channel speaker placement <br> Surround speakers are used to create an atmosphere, and occupy a very important position in the entire speaker system.
A. Types of Surround Speakers <br> At present, there are two types of surround speakers, one is a common unipolar small speaker, which is usually placed on the speaker stand or hung on the wall. Another type of surround The speakers are THX-recommended dipole speakers. Each speaker has two back-back speakers, which are connected in reverse phase. The speakers are only high-frequency sounds from the front and rear. Low-frequency sound (even if you input low-frequency signal, it can't make bass due to offset). Why is this? Let's look at the working process of the dipole speaker. The speaker has two speakers on the back*. The two speakers are fed with opposite phase signals, and the A speaker inputs a positive polarity signal, and the paper cassette moves forward to compress the front air (increased density). At the same time, the B speaker inputs a negative polarity signal. The low box moves backwards, so that the air in front of it is sparse (reduced density). The direction of the sound waves in front of the two speakers is opposite. If the two speakers feed in the full-band signal, the low frequency is strong because of its long wavelength. The low frequency sound from the A speaker will wrap around When it hits the B speaker, it is weakened (cancelled); while the medium-high frequency signal has a short diffracting power, the mid-high frequency sound on both sides of the speaker is small, so the offset effect in front of the speaker is not obvious, so the two Only the speaker emits high-frequency sound to the front and rear, and no low-frequency sound is produced. The purpose of using the dipole speaker is to avoid excessive directionality.
For the audio industry, the dipole speaker is a very strange type. This kind of speaker needs to be developed to mature. This kind of speaker is not full frequency band, because the frequency below 100MHz has been cut off. Therefore, the speaker is used because it only sounds forward and backward at the same time and never sounds to the side where the listener is located, and the sound is heard before the listener is filled with the listening room, so that a hearing habit can be created. Surrounding sound.
B. Surrounding speaker placement <br> The arrangement of the loop speaker should be different depending on the listening environment (room condition) and the type of loop speaker. The left and right surround speakers of the two channels have diffused sound. Should be more directional, which is conducive to create a rich surrounding atmosphere. When placing dipole-type speakers, we must consider two factors: resonance and self-fading. The best anti-resonance is 20% from the ceiling (or ground). The height of the indoor space (such as the indoor height of 2.5m, the best position is 50cm above and below). In order to make the frequency response smoother, a new device called low frequency "trap" (absorbing low audio) can be added to eliminate the reflection that causes the sound to decay.
For direct-radiation loop speakers, there are many options to consider. For example: fixed on the walls on both sides and pointing them to the rear corner; fixed on the rear wall, making them open and upward in an inverted figure-eight shape and Facing the combination of the side wall and the ceiling; placed on the floor of the two sides* wall, pointing upwards to the junction of the wall and the ceiling, etc. Many other schemes can be designed according to the specific conditions of the room. The surround sound field of the home theater is mainly * indoor Each anti-sound is formed by the acoustic reflection and refraction of the surrounding speakers, and the room acoustic conditions of different rooms vary widely. As long as the patience test and careful comparison, the best placement plan will be found.
4. The subwoofer is usually placed near the corner of the front wall, preferably more than 1m from the corner, which can reduce the interference of standing waves. You can also put the subwoofer on both sides of the best listening position. Keep the proper distance, because the human ear is not sensitive to the directionality of the subwoofers from both sides, so the subwoofer will not interfere with the original sound image localization of the front three channels. Of course, the best pendulum The placement position should still be determined by experimentation.
The method described below may be helpful in finding the best placement of the subwoofer. Place the subwoofer in the best listening position (temporarily remove the nearby debris), connect its speaker cable and play a strong bass repeatedly. The effect of the music, then carefully around the room to listen. Listen, ask the ear to stick to the ground, roughly at the height of the subwoofer. When listening, find the most stable, deepest, clearest point of the bass, that is super The best placement of the subwoofer. [page] The home listening room should have both good acoustic performance and a beautifully decorated living room with a warm atmosphere. To this end, several suggestions for renovation were proposed.
1, door and window processing <br> The purpose of handling doors and windows is sound insulation, sound absorption and dust.
A lot of noise enters the room through doors and windows. A good wooden door can reduce the indoor noise level after the door is closed (10-20) db. If the door frame is covered with a sealing strip, the noise level (14-18) db can be reduced.
If the outdoor sound is noisy, it is recommended to install double-glazed windows. Generally, the width of the living room window sill is about (12-15) cm, and a glass window can be added to the edge of the window sill to protect against dust, noise and warmth. Double glazed windows reduce outdoor noise (14-18) db; if covered with a sealing strip, it can be reduced by (18-20) dB. If the conditions permit, aluminum alloy window can be installed to make push-pull type, save space, easy to use, not easy to deform, good sealing performance, and its performance is better than steel window.
If the air conditioner is installed in the home, the air conditioning duct is the inlet air outlet and the noise entrance; if the TV room is installed
The antenna and the antenna input are also noise inlets. These pipes should be silenced with extreme interfaces.
Curtains, curtains and tapestries are important sound absorbers, and they are more delicate and luxurious decorations. The use of velvet and velvet as curtain material and curtain material can reduce the reflection of sound waves and the resonance of glass windows. The sound absorption coefficient of the velveteen curtain is 0.31-0.47, the sound absorption coefficient of the curtain made by the medium and long fiber is 0.15-0.27, and the double-layer velvet has the largest sound absorption coefficient of 0.69-0.82.
2. Indoor side treatments <br> Sound and sound absorption should be handled on the ground. It is best to lay a carpet, which is ideal for sound absorption and sound insulation. Generally, ordinary woven carpets are about 0.5-0.71, while real wool rugs have a sound absorption coefficient of about 0.68-0.82. It is better to set up the wooden floor. If it is limited to the conditions, it can be changed. The sound absorption coefficient of wooden floors is about 0.03--0.05. Sometimes people are willing to lay plastic bricks or tiles, their sound absorption and sound insulation performance is poor, the sound absorption coefficient of plastic floor is 0.02=--0.04, terrazzo scene sound absorption The coefficient is about 0.01--0.03.
The ceiling is also an important way to introduce noise. Those with poor quality and thin slab ceilings are easy to transmit the roof, beautiful and soundproof, with little impact on the height of the room.
Also deal with the four walls. Ordinary walls are dry plastered brick walls. The sound absorption coefficient is very small. About 0.02--0.04 can make four walls into wooden walls; or make wooden wall skirts with heights (0.8--1) m, wall skirts. Keep a certain distance from the wall, not less than 4cm, form a cavity between the walls, which can increase the low-frequency sound absorption effect. There are many kinds of concrete wall skirts. Users can also create new ones. If you can change the wall into a wave, arc, patch, etc., you can improve the acoustics in the interior. condition. China Home Theater Network
Usually the walls are white or sprayed with ash, spray paint, color spray or other paints, and their sound absorption effect is similar. In addition, the condition can be concerned with the decorative cloth on the wall, and the wall cloth is suitable for the wall (3-5) cm. This kind of wall cloth can enhance the sound absorption and beautify the living room.
3, the furnishings of indoor furniture
(1)Typical data <br> Many home listening rooms can enjoy music, and can also receive guests, to achieve the unification of audio-visual enjoyment and aesthetics. At present, the height of the ordinary room is relatively low, only (2.4-2.8) m. In order to balance the listening effect, the length and width should be close to 1.7:1. Generally, the area of ​​the listening room is more than 15 square meters, so that when the stereo is reproduced, the distance between the two speakers is about (2-2.5) m, which is advantageous for expanding the stereo image group.
(2) Display skills <br> The placement of indoor furniture should strive to be convenient to use and elegant in the living room. When placing furniture, try not to take a symmetrical shape to prevent acoustic dyeing.室内勿放置引起振动的物å“，如金属画ã€å£³è–„质轻的陈列å“ç‰ï¼Œå®ƒä»¬çš„振动将影å“放音效果。
房间内摆放组åˆæŸœã€å§å®¤æŸœã€å¤§æ²™å‘ç‰ï¼Œå¯¹æ”¹å–„å¸å£°æ•ˆæžœå¾ˆæ˜Žæ˜¾ï¼Œç‰¹åˆ«å¯¹æ”¹å–„低频效应尤为明显。一般居室ä¸èƒ½å®‰è£…ç©¿å”æ¿è°æŒ¯è…”ï¼Œå› è€Œä¸ä¾¿äºŽå¸æ”¶ä½Žé¢‘。摆放衣柜åŽå¯ä»¥å…‹æœè¿™ä¸ªç¼ºç‚¹ã€‚
玻璃窗挂厚窗帘，墙å£æŒ‚å£æ¯¯ï¼Œåœ°é¢é“ºåœ°æ¯¯ï¼ŒåºŠä¸Šé“ºåºŠç½©ç‰ï¼Œéƒ½å¯ä»¥æ”¹å–„声å¦æ¡ä»¶ã€‚挂帘对低频的é€å°„性能较好，而玻璃窗对低频的å¸å£°æ€§èƒ½è¾ƒå¥½ï¼Œå®ƒä»¬ä¹‹é—´å…·æœ‰äº’补作用。
（3）混å“时间微调 <br> 室内混å“时间应当控制在一定范围内。若混å“时间过长，声音有拖尾ã€å›žå£°ã€å¯ä»¥é€šè¿‡é“ºè®¾åœ°æ¯¯ã€æŒ‚装饰帘ç‰åŠžæ³•æ¥å¢žåŠ å¸å£°é‡ï¼Œç”šè‡³å®¤å†…摆设布娃娃ã€ä¸ç»’玩具ã€èŠ±è‰ç›†ç‰ï¼Œéƒ½å¯ä»¥æ”¹å–„å¸å£°æ•ˆæžœã€‚若室内混å“时间过çŸï¼Œå£°éŸ³å¹²æ¶©ï¼Œåº”å½“å¢žåŠ åå°„é¢ï¼Œå¯ä»¥æŒ‚玻璃镜ã€æŒ‚大型玻璃镜框的图画ç‰ï¼Œæ¥æ”¹å–„室内音质。
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有些人怕振动，时常将ＣＤã€æ‰©å¤§æœºç›´æŽ¥æ”¾åœ¨åœ°ä¸Šï¼Œç”šè‡³ç”¨åœ°æ¯¯ä½œåž«ï¼Œå¸Œæœ›æœ‰å¸æŒ¯çš„作用，ç†è®ºä¸Šå¥½åƒåœ°æ¿ç¡¬ï¼ŒæŒ¯åŠ¨æœ€å°ï¼Œ 似乎行得通，但在我们的试验ä¸ï¼Œå£°éŸ³å´æ˜¯æœ€ç³Ÿç³•çš„一ç§ï¼Œä¸€æ–¹é¢åœ°æ¿æ˜¯æœ€å¤§é¢ç§¯çš„声音é¢ï¼ŒæŒ¯åŠ¨çš„能é‡ç›¸å½“大，å¦ä¸€æ–¹é¢å£°éŸ³çš„分低频是在下方，我们知é“低频能é‡æ˜¯æœ€å¤§çš„，这ç§æ”¾æ³•æœ‰è¿å«ç”Ÿçš„原则。
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好的音å“架首é‡ç¨³ï¼Œè‡ªç„¶æ质宜愈钢性愈好，有的音å“架用粗的架å，但在架上放的å´æ˜¯è–„的夹æ¿ï¼Œå¥½ä¸€ç‚¹çš„是用"é’‰"å°†æ¿å†æ’‘èµ·æ¥ï¼Œè¿™éƒ½ä¸å¥½ï¼Œæœ€å¥½çš„是用厚一点的垫æ，ä¸é—´æŠŠå®ƒæŒ–空，åªç•™ä¸‹å››å‘¨è¶³ä»¥æ”¾å™¨æçš„ä½ç½®å³å¯ï¼Œå¦‚æžœå¯èƒ½ç©ºçš„部份放片隔离网效果会更好。这ç§åšæ³•çŽ°ä»Šå¸‚é¢ä¸Šæ怕还没人åšï¼Œä¸è¿‡æ²¡å…³ç³»ï¼Œå’±ä»¬æ¥æ”¹ã€‚
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Take a deep breath, close your eyes, the world has the freshest oxygen ... Yu Quan's "Deep Breath" is well known to us, but as the environmental problems become more and more serious, the haze sky also increases, PM2.5 PM10 and so on Vocabulary has also been mentioned more and more, and air purifiers have quickly become popular on the market with this "air quality" trend. Along with this, the air-clean brand has sprung up, and various technologies are dazzling. Which ones are indeed effective and which are just tasteless propaganda? How does the Air Purifier bother us to get rid of pollution? And look at the editors for you.
Analysis of air purifier
The critical value of PM2.5 content is 75 μg / m3
The pollutants in the air mainly include soot, total suspended particulates, inhalable particulates (PM2.5) and fine particulates (PM10). The smaller the diameter of the particulates, the deeper the part that can enter the respiratory tract. 10 micron diameter particles It is deposited in the upper respiratory tract, and particles below 2 microns can penetrate 100% into the bronchiole and alveoli.
Air purifier Air Cleaner Home air purifeir sales increased by 90.5% compared with last year
According to a report recently released by the China Electronics and Information Industry Development Institute, due to the haze weather, air purifiers have become the most concerned home appliance products, with sales of nearly 2.4 million units nationwide last year, a year-on-year increase of 90.5%; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%.
HEPA filter needs to be replaced
The filter of the air purifier is the same as the filter of the water purifier, and it is not effective for a long time. After long-term use, the accumulation of dust on the surface of the filter will also cause the filter to gradually fail. Therefore, when the haze is more serious, the non-washable HEPA filter needs to be replaced every three months.
Negative Air Purifier,Negative Air Cleaner, Air Purifier Manufacturer in China
Ningbo Zhe Kai Electric Appliance Co.,Ltd , https://www.cnairpurifiers.com