Five points of home theater acoustic decoration design goals
A sufficient loudness (sound pressure level)
In the absence of noise, the replay sound heard by the audience should not be felt, and the ears are not felt. Usually, the average sound pressure level of 85DB is required, and the sound of the sound is not distortion-reproduced, and there is a 10DB margin. The digital surround system should have a dynamic margin of 20-30DB.
B uniform sound field distribution
Uniform distribution of the sound field ensures uniform distribution of sound energy at all points in the hall. The loudness heard by the audience in each area is basically the same, but the maximum sound pressure level and the minimum sound pressure level in the entire hall should not exceed 6 DB, maximum/minimum. The sound pressure level and the average sound pressure level sound are preferably not more than 3DB.
C Suitable reverberation time
Reverberation time is an important parameter that affects the sound quality of the theater. When the reverberation time is controlled properly, the speech clarity and tone fullness can be improved.
D frequency response and effective frequency range
The frequency response refers to the characteristic that the output sound pressure varies with frequency when the speaker is pressed (generally 1/10 frequency-densified noise power voltage) and the speaker is on the reference axis from the reference point. The ability of the loudspeaker to radiate sound waves of different frequencies. The frequency response is usually expressed by the speaker output sound pressure level as a function of the frequency change, called the frequency response curve.
E sound and noise ratio meets the requirements
Indoor ambient noise will cause dryness and masking for normal hearing. The noise in the cinema should be no less than 42DB.
To meet the above conditions, we give the following suggestions on the layout of the audio-visual room: Welcome to the home theater network shopping guide!
1, the placement of room facilities Because the audio-visual room has certain requirements for the length, width and height ratio, it is difficult to achieve a perfect golden section. However, the placement of the sofa wall will result in the loss of the surround effect, resulting in a decline in audio-visual sound quality. The overall arrangement of the room can be considered for 90° rotation, and the sofa is located in front of the door, and the position of the “center†is behind.
2. Reverberation time control The optimal reverberation time of the home audio-visual room at 500HZ is 0.4~0.6s. According to the Sabin formula, the total sound absorption coefficient of the room can be calculated. According to the site conditions, you can refer to the following settings:
a. Wall sound absorption settings. Dark wood acoustic panels are used on the front and side walls (see the description of the sound insulation section) to ensure adequate sound absorption. The color is dark, in order to better restore the visual effect.
b. In order to avoid the occurrence of standing waves, set a low frequency trap (for a quarter cylindrical sound absorber) at the corner of the front wall. At the same time, a diffused sound absorbing structure is arranged in the first reflecting area of ​​the top surface (the "cross grid + sound absorbing body" can be adopted); the side wall is provided with a diffusing body (can be in the form of a continuous semicircle or a triangular cylinder, and the surface layer is Sound absorbing material).
c. Ground In order to avoid excessive sound reflection, cork flooring is used, and a certain thickness of carpet can be placed in the sofa area.
3, indoor furniture furnishings in the audio-visual room, should be arranged some sound-absorbing materials, such as wall hanging blankets, floor carpets, soft bags, soft wood, etc., to avoid large areas of glass, stone and other mirror materials. A decorative frame such as a dish rack is placed on the side wall to realize the function of the diffuser. The choice of the back of the sofa is not necessarily too high, generally lower than the normal listening height of the indoors.
4. The arrangement of audio equipment needs to consult a special supplier. Of course, if the requirements for viewing conditions are not very harsh, the second point c and the third point can be selected as reference points in the decoration. In addition, sound-absorbing materials such as soft packs are not necessary to be fully covered. Excessive sound absorption and insufficient reverberation will cause the sound to be too dry. The wall should also be properly arranged with diffusers. The main control area is the first reflection and Two side walls. Determining the audio-visual effects of the audio-visual room, the proportion of equipment and interior space design is almost equal, which is worthy of attention.
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