[Home Theater Network HDAV.com.cn] Each room has different acoustic characteristics. Each sound space has different unique sound characteristics due to space size, proportion and decoration design. So even the same audio equipment, In different sound spaces, different sound characteristics will also be produced. The successful sound space will create a charming sound charm. The following small series will introduce you to the 12 criteria for acoustic processing of home theater audio:
First, soft-tuning space is more suitable for listening to music
Floors, ceilings, walls with plywood, gypsum board or wooden boards are soft-tuned spaces. The space of reinforced concrete or brickwork is called hard-adjusted space. At present, most of China's living environment is hard-adjusted.
Because the hard-adjusted space can't properly absorb the extra high-pitched and mid-bass, it causes the treble of the music to be too harsh or the bass is too dull. Although the soft-tuning space may also have the disadvantage of excessive bass absorption and insufficient bass, but practice Prove that soft-tuning space is still more suitable for listening to music.
Second, the use of reflection, absorption and diffusion
Carefully blending reflection, absorption and diffusion sound waves, the purpose is to get warm, full, soft, rich, clear, transparent sound.
Third, the big space is better than the small space
The volume of the large space is large, and the sound waves emitted by the speakers are less affected by the distortion of the boundary (six-sided wall), and the obtained sound is relatively correct. In a large space, if properly deployed, the obtained sound will be easier, uniform and correct. And the low frequency dive deeper. As for the standing wave, although the large space can not be completely avoided, but the degree of harm is relatively low.
Fourth, equipment should be appropriate
Each sound space will have its own sound characteristics. These sound features also need to match the appropriate speakers to play the effect of safflower green leaves. The better the sound space layout, the wider the range of matching. Conversely, if the sound space is not ideally arranged, Only a small number of equipment can be found to adapt to such a biased space. The size of the space is different, and the matching speakers are different. It is futile to use a large speaker in a small space or a small speaker in a large space. This depends on a wealth of experience to achieve perfection. Effect.
5. Rational enthusiasts should minimize exclusivity
It is inevitable that each enthusiast will develop his own listening habits and preferences because he is in his own audio space for a long time. Based on these habits and preferences, it is easy to judge other people's audio space and listening habits and preferences. Therefore, when you hear different sound performances, don't make any exclusive comments first, but try to find out the strengths of others' sound effects.
Sixth, try to transform the hard-adjusted space into a soft-tuned space
If you want to turn the hard-adjusted space into a soft-adjusted space, you can first transform the four-sided wall. For example, use a gypsum board to nail the interlayer, and the interlayer is covered with fiberglass. This will not reduce the space of many interlayers, but also improve the sound insulation effect. The reason for using gypsum board or splint is that thin splint or wooden core board is easy to absorb midrange, and gypsum board is heavy, absorbs more bass, and has less negative impact on listening music. In addition, gypsum board is fireproof material. Used to make the sandwich is safer.
Seven, the second remainder diffuser is very easy to use
Diffusion is the sound wave emitted by the speaker, which is reflected uniformly in all directions, no matter from which direction. Generally, the sound reflection is usually oriented. In theory, as long as the length of the reflection surface is larger than the wavelength of the sound wave, all the sound waves with shorter wavelength than the reflection surface It will be reflected in a certain direction. The sound space needs diffusion, not directional reflection. Because the diffusion will make the sound waves in the room more uniform, and the directional reflection will only affect a certain part.
Eight, the sound effect of the sound space should be based on live music
The standard of sound space sound effects is not unique, but multiple. The standard of sound effects is based on the performance of live music. The sound effect of live music is not unique, but multiple. In terms of classical music, There are many outstanding concert halls in the world, each with different sound characteristics. Some are warm, some are full, some are clear and transparent, some are low-frequency, some have a good sound, and the sound characteristics of these concert halls are different. Have a long time.
Affected by the unknown sound recording site sound characteristics, sound recording equipment sound characteristics, replay equipment sound characteristics and sound space sound characteristics, enthusiasts can only be based on the performance of live music, and is a multiple standard.
Nine, standing wave should only be taken
Standing wave is the resonance phenomenon of space. As long as the distance between two opposing parallel walls is equal to an integral multiple of half wavelength, resonance will occur and a standing wave will be generated. If the standing waves generated by the three parallel walls in space have overlapping frequencies, Will form a stronger standing wave. Standing wave is not only a single frequency, its frequency range is very wide, people can not accurately "offset" it with some measure. At the same time, the energy of standing wave is very strong, usually than normal music. The sound pressure is much higher than decibels, so you can't use the "fine tuning" tuning technique. The best way to deal with the standing wave is to avoid it by using the speaker position and changing the listening position.
Ten, the space should be surface treated
After changing the sound space from hard to soft, it should be surface treated according to the method of "pre-hard, medium-suction, and post-diffusion". The so-called "front hard" refers to the front part of the room (between the back wall of the speaker and the speaker) Try not to add absorbing materials, otherwise you must increase the output power of the amplifier to make the sound solid. If the output power of the amplifier is not very large, the speaker is not very large. It is recommended that the wall should not be nailed. The so-called "middle suction" is The sound-absorbing surface treatment is applied to the two walls between the speaker and the listening position. The purpose is to weaken the first reflection sound, improve the positioning and clarity, and avoid the sound is too bright and too harsh. The "sucking" method is many, the cheapest and effective. The material is glass wool. For example, a glass wool with a thickness of 5 cm and a weight of 20 kg per cubic meter is used. It has a sound absorption rate of up to 85% for frequencies above 500 Hz. It can be wrapped in glass wool. Do not expose it.) As the shape of the imaging frame, it becomes the first reflection of the sound absorber on both sides of the wall.
The so-called "post-diffusion" is to spread the area from the listening position to the back wall. The correct way is to put two diffusing plates in the two corners of the back wall, and then put a diffusing plate in the center of the back wall to play the real Diffusion effect. After the sound wave is evenly diffused, the sound wave reflections heard everywhere in the listening area are average, and the listening position is not limited to the "emperor position"; and it can significantly improve the sound quality, tone color, layering, depth, etc. .
XI, space decoration skills
The indoor items absorb and reflect the sound waves and naturally adjust the reverberation. The heavier weight items absorb more mid-low frequency or low frequency, sometimes reduce the influence of low- and medium-low standing waves. The surface is multi-fiber, porous soft. The quality of the article has a strong absorption of high frequency, such as the surface of the flannel sofa, carpet flannel, etc. It is worth noting that all kinds of furniture in the acoustic space do not use glass doors.
12. The quadratic residue diffuser has a special diffusion characteristic.
If the center frequency is used as a reference, its diffusion low limit can be extended down to about half the frequency below the center frequency (if the center frequency is 1000 Hz, the half frequency is 750 Hz), and the upper limit can be as high as the center frequency N- 1 time. Assuming a center frequency of 1000 Hz, the step of the quadratic residue diffuser is 7, and the upper limit of the diffusion range is about 6000 Hz. More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.
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