How to reduce the low frequency standing wave in a small audio-visual room

[Home Theater Network HDAV.com.cn] Before an enthusiast enjoys a beautiful movement, it usually takes a lot of effort to correct and repair the acoustic environment of the listening room. Among them, standing wave is one of the most troublesome problems in building a listening room. Without specific treatment, the influence of standing wave not only affects the overall sound performance, but also affects the listener's emotions and induces other problems. occur.

Generally, a large listening room may be more tolerant in the treatment of standing waves, but in a small listening room of less than 20 square meters, it is much more difficult to deal with standing waves, so there will be a network rumor that "you need to burn the sound." The jokes of burning the house first. So, is the standing wave of a small listening room really so difficult to handle?

This "New Video and Audio Life" will start from the small listening room and share some experiences to improve the standing wave so that the lovers can enjoy the beautiful music in the small listening room.

▌ It is important to deal with the estimation of the standing wave.

First estimate the standing wave generated by which frequency, so that it can handle the general direction of the indoor environment, even if it has not been tested in detail. Here I will first provide a room size that the author once visited: 4.2 meters long, 2.8 meters wide, and the height is about 2.8 meters. Since the average speed of the sound per second is 340 meters, it is estimated by the estimation that the frequency with respect to the height is 120 Hz. Since the width and height of the room are close to each other, it can be preliminarily determined that the room has a strong standing wave at 120 Hz.

At the same time, combined with the length of the room, it can be estimated that the room will be affected by the 80Hz secondary strong standing wave. I don't know if you noticed that between 120Hz and 80Hz is an integral multiple of 40. Fans with certain experience may know that the harmonics of the common earthquake are mostly calculated by integral multiples, so this room can be calculated to have 40Hz. Harmonic resonance of 80Hz, 120Hz, 160Hz, 200Hz, etc.

▌ Slightly analyze the positioning direction

In terms of human hearing, the frequency of too low is generally not very sensitive, so it does not matter if it is 40Hz. If you feel too much from 80Hz, it will put pressure on your ears. Especially at 120Hz and 160Hz, people with sensitive ears will have obvious discomfort. At the same time, since the wavelength of 40Hz is 8.5 meters long, the length of this room as exemplified by the author is not able to reproduce the true 40H, so the main response is 80Hz, 120Hz, 160Hz, especially 120Hz, 160Hz as the main solution.

After the above estimation, it is known that the listening room is affected by the low-frequency standing wave, and then the standing wave can be processed by different methods, but it should be noted that most methods do not eradicate the standing wave, but Reduce the intensity that the human ear can accept without affecting listening.

打造 Create a listening room in good proportions

The first method is the most fundamental method, and it is also a method that is difficult for ordinary people to do. It is based on a good ratio of length, width and height. What is a good ratio of length, width, and height? As long as the source of the standing wave estimated above is reversed, it can be known that the ratio of three lengths can not be multiplied. This is the common "listening". The ratio of space to gold".

In the general home room, there are about three commonly used ratios, one of which is 1.00: 1.14: 1.39, the second is 1.00: 1.28: 1.54, and the third is 1.00: 1.: 2.33. If you think that these three sets of numbers are not easy to remember, you can also only record the two sets of numbers: 1:1.25:1.6 and 1:1.6:2.5. In practice, increase or decrease the length and width of the numbers.

▌ Corners are beveled or rounded

Due to the limited space in the small room, there may be no way to absorb the low-frequency standing wave according to the above ratio. Therefore, the second method can be used: acoustic treatment is performed using the corner, and the general treatment is to use wooden objects, triangle cabinets or Arc cabinet. However, if you seal the corners with a bevel or arc, you need to consider the angle size, material and filler.

Regarding the angular size, through the acoustic theory analysis, the angle of the bevel or the curved surface determines the diffusion frequency. If it is ideal, it needs a larger angle to process the standing wave in the middle and low frequency bands (every centimeter increase, diffusion) The frequency is about 340Hz), but in the small listening room, you only need to control the angle by 60-100cm.

If the material is wood, the filler can be placed with glass fiber. Of course, it can also be put into old clothes. The main function here is to absorb the resonance of the cavity, and the packing density does not need to be too dense. can.

▌ wood furniture also works

If there are more wooden furniture in the small room, it can also reduce the influence of the low-frequency standing wave, but at the same time, remember not to place too many glass materials in the room, otherwise there will be no effect on the low-frequency standing wave reduction. For the rest, please refer to our previous information on speaker placement and power handling. If the above methods have been tried, the low-frequency standing wave is still serious, then only the smaller size speaker can be replaced, so that the energy in the low-frequency is reduced.

Conclusion: Most of the standing waves generated by environmental problems can be solved by simple methods; even for small listening rooms, the corresponding methods are solved. If you are a lover who insists on a fever in a small listening room, I hope that you can solve your confusion about standing waves through this article and enjoy the moving music as soon as possible.

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Note: This article is transferred from the new life of audio and video. The article is an independent view of the author and does not represent the position of the home theater network.