The first thing to declare is: I am not an acoustics expert, so this article does not talk about theory. The second statement is: I have n’t tried some methods myself, but I have experienced them in some seniors ’homes. The third focus is: starting from the needs of the living room and audio room in the general family. If you are specialized in acoustics, you don't need to read this article, you should know everything I'm talking about. If the hostess at home does n’t allow you to make great efforts in building, you ca n’t stick to the west, or you do n’t agree to spend money, but you are suffering from the rumbling mid-low frequency standing waves when listening to the sound. Welcome to try it together, maybe Find a solution.
Is the mid-low frequency standing wave so terrible? In fact, every room has a standing wave, but the frequency distribution is different. The larger the space, the lower the frequency of standing wave, and the smaller the impact. How do you know the standing wave frequency of the room? The distance of the sound wave traveling every second of the wave is 340 meters by the distance of the longest side of the room. For example, the length of the room is 5 meters: 340/5 = 68, calculated as a half wave, there will be a relatively large protrusion at 32hz. And the standing wave is not only a single frequency, multiples of 32hz like 60hz, 128hz ??? also have weaker standing waves. Not only that, there are three sets of opposing walls in an enclosed space, so there will be three different sets of standing waves. Even if a pair of super speakers with a frequency response of ± 0db in a quiet room are placed in a common space, the spectrum analyzer looks like the low frequency band is still high and low, the main reason is here.
As long as they cleverly handle or use low-frequency standing waves, they are not as terrible as expected. I have heard of a pair of ultra-small speakers from the American Legacy. Of course, in the space of more than a dozen pings of magazines, it can be realized that it has a low frequency extension that exceeds the volume, but it also pays the price of a high-power amplifier. Later, the agent opened in Tianmu ’s store. The same pair of small speakers were "grown up" in the display room on the first floor. The drum sound was low and strong. The double bass was very crispy, and the amplifier used was rather powerful. smaller. People who have n’t believed that the small speakers can have such a sound, and even doubted whether the subwoofer was secretly received, but my speculation is that the space has helped a lot. The moderate amount of low-frequency standing waves makes the music more thick and heavy.
Unfortunately, not everyone is so lucky, the standing wave frequency generated in space is not necessarily what you need. When the standing wave energy is concentrated at about 100hz, the resonance of the drum point and the subsequent drum body will be too swelled, or even paste together with a bang. At the same time when the bass and drum sounds appear, the two are also easy to mix together and cannot have a clear melody line. At this time, the vocals usually also have some nasal sounds, as if they did not take medicine for a cold, and there is no transparency or details at all. In case this standing wave energy is too strong, the speaker can't be opened to listen loudly, otherwise the windows and cabinets will shake together. In the home space in Taiwan, the most frequent annoying standing wave is about 50hz. Find a test piece to try it and you will know that usually the sine wave signal will shake the whole house and rattle. The best way to avoid it is of course to plan a dedicated audio space, such as the golden ratio of 1: 1.25: 1.6 and 1: 1.6: 2.5 to build the audio, the IEC International Electrotechnical Commission also recommends this, but it is impossible for apartment families to realize their dreams. Don't mention it. You can also start by choosing the right sized speakers to avoid being greedy and squeezing subwoofers in the large space of Sanping. Another thing is to use some props to overcome.
In my personal experience, when dealing with low- and mid-frequency standing waves, diffusion is more effective than absorption. In professional recording studios and small concert halls, they have another way to deal with standing waves, that is, tailor-made low-frequency empty boxes. The manufacture of this kind of empty box has a set of formulas that can be calculated. The material is mainly mdf board, which is then stuffed with glass fiber wool. Its main function is to absorb a certain range of frequencies. When the sound wave enters the empty box, it will be attenuated and absorbed due to the energy conversion effect. The reason for the calculation is that the conditions in each space are different, and the frequency and energy to be attenuated are different, so this kind of thing cannot be produced in large quantities. In the control room of the recording studio, there is no more than six pings, but you can hear the very low frequency of 20hz completely and straight. The main secret is here.
Then it's just as good as home cooking and absorption? No way. Commercially available sound-absorbing materials, such as the fire-proof sonex, have the thickest absorption frequency of about 500hz. If this kind of sound-absorbing material is abused, the low-frequency standing wave may not be solved, but even the precious intermediate frequency is sacrificed. Adding a wood partition to the concrete wall is a method, but one project is relatively large. Second, you cannot know exactly what frequency will be absorbed (rarely there is a single frequency of absorption material). It is also one of the ways to make arcs with large curved surfaces, but to change the sound path of 100hz, the required curved surface is 1.7 meters (340/100/2), how many rooms can you make? A more practical way is to put some empty boxes, wooden cabinets in the corner of the room, or put some high-quality objects, such as boxes filled with books, chairs made of solid wood, etc. These props have the effect of absorbing or dispersing standing waves, but it is at which frequency and the degree of influence that the focus is on. You have to try it before you know it. The wooden cabinet made of sturdy materials is quite easy to use. It can be said to be a copy of the low-frequency empty box in the studio. Whether it is used to turn off the air or place a record, it is ideal. It should be noted that the wooden cabinets need to be moved in one by one to try, large and improper will have side effects. In addition, placing a few large sofas also has some effects.
You probably found out that there are uncertain factors in the above mentioned methods. Some people find that the improvement is obvious after using it, and some people may be indifferent. Uncertain factors include the size of the room, the use of equipment, environmental structure and other variables, I can not provide you with any answers. On the contrary, it is easier to deal with mid-to-high frequencies, and the commercially available "Poly Diffusion Plate" made by Styrofoam or various prgs are very useful. If you want to take care of the beauty, you can place artificial bonsai behind the horn and near the first reflection area of ​​the side wall. It is best to choose a fake tree with relatively large leaves, just as high as the people. Are there any more scientific items with data to refer to for purchase? The commercially available Styrofoam diffusers are only effective for mid-to-high frequencies. Regardless of the imported or Taiwan-made wooden rpgs, they are also designed on the basis of 1000hz. They are familiar with low frequencies. A year ago, I had to shrug my shoulders at the mid- and low-frequency standing waves. Please ask others to experiment with the above methods. Whether it can be cured is all luck. Recently I saw an advertisement from Taipei Luohua Company. They designed a large wooden diffuser for 100hz ~ 3100hz. I am very interested to borrow it and give it a try.
When a large truck comes with four diffusers, it really shocks people! How to put such a big thing? How big is the diffuser for low frequency? How big is the diffuser for low frequency? The height is about 120 cm, the length and width are 60 cm, and all are made of mdf boards. Two strong men are required to lift it. But since I borrowed it, I had to go home with a hard scalp. Luohua's diffuser plate is also made according to the theory of quadratic remainder sound diffusion proposed by the German mathematics professor manfred richard schroeder, but the calculation method is changed to 1/4 wavelength, otherwise a 100hz diffuser plate will be long and wide. More than one meter, no one can put it down. In terms of production quality, the appearance of the mdf board sprayed with black flat paint this time has improved a lot compared to the first veneer finished. I privately hope that Luohua can also make some lacquer products. The wood color is less stressful in the home environment, and it is easy to match with furniture.
My large listening room has about 13 pings. The ceiling and the back wall of the speaker and both sides of the wall are treated with some prg diffusers. Behind the listening position is a piano and a large wall blanket. There are also sofas and wooden cabinets. , Carpets and other furnishings. It turned out that there was a depression around 125hz. After adding two m & k subwoofers, the spectrum analyzer was used to adjust it. Below 200hz, it could maintain an ideal state within ± 2db. Of course, these four Big Macs will not have an aggressive sense of oppression only when placed in such a large space. I divided them in the four corners of the room, hoping to further improve the resolution of low frequencies. In the past, we dealt with arcs or sloping plates at the corners of the walls, which usually have effects on mid- and high-frequency. The placement of room trap or roon tune is also designed to absorb mid- and high-frequency so that it will not have excessively compact energy. They are helpless about low frequencies. Nevertheless, the use of these methods has clearly helped the expansion and clarity of the back row of the sound field. Would n’t it be great if Luo Hua ’s diffuser board could handle even low frequencies?
A total of more than a month, I moved back and forth, swayed left and right, and performed unprecedented manual labor. Due to the fact that the Luohua diffuser is so large, it often changes its position and even the equipment must be moved, and these post-stage expansion maneuvers are more than fifty or sixty kilograms. Fortunately, the weather is still cool, or heat stroke will be necessary. In my large listening room, the Luohua diffuser did not bring about earth-shattering changes. It should be said that there is no serious low-frequency standing wave in this space, so it can't let it exert its strength. However, if you compare them carefully, you will still find that the sound below the mid-frequency is relaxed. The dorian sacred "pipe organ" symphony is still very low-frequency caused by air fluctuations, but the energy is evenly spread; It also shakes the floor, but the disgusting stimulus is reduced; the special effects of the "Starship Adventures" by tararc are scary, but the turbulent shock waves will not make the dirty organs roll over.
Mr. Luo Huayao suggested that these diffusers would be more effective when placed in a small room, so they moved to a small listening room of about six and a half inches. Here, the two side walls are filled with records, deliberately creating uneven diffusion surfaces, and behind the listening position is another wall of books. As for the floor-to-ceiling windows with curtains behind the speakers, the green hills and green waters that are rare in Taipei are outside the windows. There are often cool winds blowing in summer, and I am reluctant to modify them. After a lot of diffusion treatment, the middle and high frequencies are quite smooth and flexible, but there are still some low-frequency standing waves with large fluctuations below 50hz. Finally, it is difficult to "plug" the four low-frequency diffusers into the four corners. The visual pressure has increased a lot. This is something that buyers who are interested must pay special attention to.
Sure enough, the low frequency diffuser played a role here. The low frequency of the magnepan mg-35 flat horn extruded through the front and rear stages of aragon is strong and powerful, with tight control and excellent transparency. However, in this space, the lowest part of the electric bass is prone to a low-frequency peak, and listening to some Mandarin songs is also prone to rumbling uncomfortable sounds. After the diffusion process, the low-frequency peaks are gone, and the sensation of rumbling is gone. The pair of flat speakers can finally sing loudly here, giving a very natural and transparent sound. It should be noted that the sense of low-frequency volume is not reduced, but spreads evenly. When the volume is turned up, there is no particularly concentrated energy, and the sense of hearing is much more comfortable. According to Mr. Luo Huayao, his audition room is only three pings large. After using the low-frequency diffuser, the landing loudspeaker sings bravely and powerfully, without the trouble of low-frequency standing waves. Mr. Yao often participates in discussions on the bbs computer network. Those who want to know more may wish to consult him directly.
Although the low-frequency diffuser is quite effective, due to its large size, readers are still advised to measure their own space first, and do n’t be surprised if they buy it home. But I would particularly recommend Luohua ’s other diffusion plate for mid- and high-frequency use. Its volume is 61 × 121 × 21cm, and its weight is also more than 30 kg. It is designed according to the theory of quadratic remainder diffusion, but the data is changed to 1 / 4 wavelength calculation, so the stepping is doubled than the common soap prg, and the diffused waveform is more uniform. I placed the Luohua diffuser plates on both sides of the large listening room to replace the original rpg, and also placed it behind the speakers in the small listening room (that is, in front of the floor-to-ceiling windows), and found that they are more effective than rpg. The smaller the room, the more you can realize what the ad slogan said: the room seems to be gone!
Is the mid-low frequency standing wave so terrible? In fact, every room has a standing wave, but the frequency distribution is different. The larger the space, the lower the frequency of standing wave, and the smaller the impact. How do you know the standing wave frequency of the room? The distance of the sound wave traveling every second of the wave is 340 meters by the distance of the longest side of the room. For example, the length of the room is 5 meters: 340/5 = 68, calculated as a half wave, there will be a relatively large protrusion at 32hz. And the standing wave is not only a single frequency, multiples of 32hz like 60hz, 128hz ??? also have weaker standing waves. Not only that, there are three sets of opposing walls in an enclosed space, so there will be three different sets of standing waves. Even if a pair of super speakers with a frequency response of ± 0db in a quiet room are placed in a common space, the spectrum analyzer looks like the low frequency band is still high and low, the main reason is here.
As long as they cleverly handle or use low-frequency standing waves, they are not as terrible as expected. I have heard of a pair of ultra-small speakers from the American Legacy. Of course, in the space of more than a dozen pings of magazines, it can be realized that it has a low frequency extension that exceeds the volume, but it also pays the price of a high-power amplifier. Later, the agent opened in Tianmu ’s store. The same pair of small speakers were "grown up" in the display room on the first floor. The drum sound was low and strong. The double bass was very crispy, and the amplifier used was rather powerful. smaller. People who have n’t believed that the small speakers can have such a sound, and even doubted whether the subwoofer was secretly received, but my speculation is that the space has helped a lot. The moderate amount of low-frequency standing waves makes the music more thick and heavy.
Unfortunately, not everyone is so lucky, the standing wave frequency generated in space is not necessarily what you need. When the standing wave energy is concentrated at about 100hz, the resonance of the drum point and the subsequent drum body will be too swelled, or even paste together with a bang. At the same time when the bass and drum sounds appear, the two are also easy to mix together and cannot have a clear melody line. At this time, the vocals usually also have some nasal sounds, as if they did not take medicine for a cold, and there is no transparency or details at all. In case this standing wave energy is too strong, the speaker can't be opened to listen loudly, otherwise the windows and cabinets will shake together. In the home space in Taiwan, the most frequent annoying standing wave is about 50hz. Find a test piece to try it and you will know that usually the sine wave signal will shake the whole house and rattle. The best way to avoid it is of course to plan a dedicated audio space, such as the golden ratio of 1: 1.25: 1.6 and 1: 1.6: 2.5 to build the audio, the IEC International Electrotechnical Commission also recommends this, but it is impossible for apartment families to realize their dreams. Don't mention it. You can also start by choosing the right sized speakers to avoid being greedy and squeezing subwoofers in the large space of Sanping. Another thing is to use some props to overcome.
In my personal experience, when dealing with low- and mid-frequency standing waves, diffusion is more effective than absorption. In professional recording studios and small concert halls, they have another way to deal with standing waves, that is, tailor-made low-frequency empty boxes. The manufacture of this kind of empty box has a set of formulas that can be calculated. The material is mainly mdf board, which is then stuffed with glass fiber wool. Its main function is to absorb a certain range of frequencies. When the sound wave enters the empty box, it will be attenuated and absorbed due to the energy conversion effect. The reason for the calculation is that the conditions in each space are different, and the frequency and energy to be attenuated are different, so this kind of thing cannot be produced in large quantities. In the control room of the recording studio, there is no more than six pings, but you can hear the very low frequency of 20hz completely and straight. The main secret is here.
Then it's just as good as home cooking and absorption? No way. Commercially available sound-absorbing materials, such as the fire-proof sonex, have the thickest absorption frequency of about 500hz. If this kind of sound-absorbing material is abused, the low-frequency standing wave may not be solved, but even the precious intermediate frequency is sacrificed. Adding a wood partition to the concrete wall is a method, but one project is relatively large. Second, you cannot know exactly what frequency will be absorbed (rarely there is a single frequency of absorption material). It is also one of the ways to make arcs with large curved surfaces, but to change the sound path of 100hz, the required curved surface is 1.7 meters (340/100/2), how many rooms can you make? A more practical way is to put some empty boxes, wooden cabinets in the corner of the room, or put some high-quality objects, such as boxes filled with books, chairs made of solid wood, etc. These props have the effect of absorbing or dispersing standing waves, but it is at which frequency and the degree of influence that the focus is on. You have to try it before you know it. The wooden cabinet made of sturdy materials is quite easy to use. It can be said to be a copy of the low-frequency empty box in the studio. Whether it is used to turn off the air or place a record, it is ideal. It should be noted that the wooden cabinets need to be moved in one by one to try, large and improper will have side effects. In addition, placing a few large sofas also has some effects.
You probably found out that there are uncertain factors in the above mentioned methods. Some people find that the improvement is obvious after using it, and some people may be indifferent. Uncertain factors include the size of the room, the use of equipment, environmental structure and other variables, I can not provide you with any answers. On the contrary, it is easier to deal with mid-to-high frequencies, and the commercially available "Poly Diffusion Plate" made by Styrofoam or various prgs are very useful. If you want to take care of the beauty, you can place artificial bonsai behind the horn and near the first reflection area of ​​the side wall. It is best to choose a fake tree with relatively large leaves, just as high as the people. Are there any more scientific items with data to refer to for purchase? The commercially available Styrofoam diffusers are only effective for mid-to-high frequencies. Regardless of the imported or Taiwan-made wooden rpgs, they are also designed on the basis of 1000hz. They are familiar with low frequencies. A year ago, I had to shrug my shoulders at the mid- and low-frequency standing waves. Please ask others to experiment with the above methods. Whether it can be cured is all luck. Recently I saw an advertisement from Taipei Luohua Company. They designed a large wooden diffuser for 100hz ~ 3100hz. I am very interested to borrow it and give it a try.
When a large truck comes with four diffusers, it really shocks people! How to put such a big thing? How big is the diffuser for low frequency? How big is the diffuser for low frequency? The height is about 120 cm, the length and width are 60 cm, and all are made of mdf boards. Two strong men are required to lift it. But since I borrowed it, I had to go home with a hard scalp. Luohua's diffuser plate is also made according to the theory of quadratic remainder sound diffusion proposed by the German mathematics professor manfred richard schroeder, but the calculation method is changed to 1/4 wavelength, otherwise a 100hz diffuser plate will be long and wide. More than one meter, no one can put it down. In terms of production quality, the appearance of the mdf board sprayed with black flat paint this time has improved a lot compared to the first veneer finished. I privately hope that Luohua can also make some lacquer products. The wood color is less stressful in the home environment, and it is easy to match with furniture.
My large listening room has about 13 pings. The ceiling and the back wall of the speaker and both sides of the wall are treated with some prg diffusers. Behind the listening position is a piano and a large wall blanket. There are also sofas and wooden cabinets. , Carpets and other furnishings. It turned out that there was a depression around 125hz. After adding two m & k subwoofers, the spectrum analyzer was used to adjust it. Below 200hz, it could maintain an ideal state within ± 2db. Of course, these four Big Macs will not have an aggressive sense of oppression only when placed in such a large space. I divided them in the four corners of the room, hoping to further improve the resolution of low frequencies. In the past, we dealt with arcs or sloping plates at the corners of the walls, which usually have effects on mid- and high-frequency. The placement of room trap or roon tune is also designed to absorb mid- and high-frequency so that it will not have excessively compact energy. They are helpless about low frequencies. Nevertheless, the use of these methods has clearly helped the expansion and clarity of the back row of the sound field. Would n’t it be great if Luo Hua ’s diffuser board could handle even low frequencies?
A total of more than a month, I moved back and forth, swayed left and right, and performed unprecedented manual labor. Due to the fact that the Luohua diffuser is so large, it often changes its position and even the equipment must be moved, and these post-stage expansion maneuvers are more than fifty or sixty kilograms. Fortunately, the weather is still cool, or heat stroke will be necessary. In my large listening room, the Luohua diffuser did not bring about earth-shattering changes. It should be said that there is no serious low-frequency standing wave in this space, so it can't let it exert its strength. However, if you compare them carefully, you will still find that the sound below the mid-frequency is relaxed. The dorian sacred "pipe organ" symphony is still very low-frequency caused by air fluctuations, but the energy is evenly spread; It also shakes the floor, but the disgusting stimulus is reduced; the special effects of the "Starship Adventures" by tararc are scary, but the turbulent shock waves will not make the dirty organs roll over.
Mr. Luo Huayao suggested that these diffusers would be more effective when placed in a small room, so they moved to a small listening room of about six and a half inches. Here, the two side walls are filled with records, deliberately creating uneven diffusion surfaces, and behind the listening position is another wall of books. As for the floor-to-ceiling windows with curtains behind the speakers, the green hills and green waters that are rare in Taipei are outside the windows. There are often cool winds blowing in summer, and I am reluctant to modify them. After a lot of diffusion treatment, the middle and high frequencies are quite smooth and flexible, but there are still some low-frequency standing waves with large fluctuations below 50hz. Finally, it is difficult to "plug" the four low-frequency diffusers into the four corners. The visual pressure has increased a lot. This is something that buyers who are interested must pay special attention to.
Sure enough, the low frequency diffuser played a role here. The low frequency of the magnepan mg-35 flat horn extruded through the front and rear stages of aragon is strong and powerful, with tight control and excellent transparency. However, in this space, the lowest part of the electric bass is prone to a low-frequency peak, and listening to some Mandarin songs is also prone to rumbling uncomfortable sounds. After the diffusion process, the low-frequency peaks are gone, and the sensation of rumbling is gone. The pair of flat speakers can finally sing loudly here, giving a very natural and transparent sound. It should be noted that the sense of low-frequency volume is not reduced, but spreads evenly. When the volume is turned up, there is no particularly concentrated energy, and the sense of hearing is much more comfortable. According to Mr. Luo Huayao, his audition room is only three pings large. After using the low-frequency diffuser, the landing loudspeaker sings bravely and powerfully, without the trouble of low-frequency standing waves. Mr. Yao often participates in discussions on the bbs computer network. Those who want to know more may wish to consult him directly.
Although the low-frequency diffuser is quite effective, due to its large size, readers are still advised to measure their own space first, and do n’t be surprised if they buy it home. But I would particularly recommend Luohua ’s other diffusion plate for mid- and high-frequency use. Its volume is 61 × 121 × 21cm, and its weight is also more than 30 kg. It is designed according to the theory of quadratic remainder diffusion, but the data is changed to 1 / 4 wavelength calculation, so the stepping is doubled than the common soap prg, and the diffused waveform is more uniform. I placed the Luohua diffuser plates on both sides of the large listening room to replace the original rpg, and also placed it behind the speakers in the small listening room (that is, in front of the floor-to-ceiling windows), and found that they are more effective than rpg. The smaller the room, the more you can realize what the ad slogan said: the room seems to be gone!
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