[Home Theater Network HDAV.com.cn] Private home theater is a space where people enjoy life and experience entertainment at home. In the actual case, many people have designed this space as a multi-functional audio-visual entertainment room, which is a combination of watching movies, listening to music, karaoke, and game entertainment. Among them, watching movies and K songs is the most popular. The combination of choices. This will cause many people to ask a question. The KTV room and the movie room are different in acoustic characteristics. Combine these two functions in the same private home theater. Does it have conflicting acoustic effects? How do private home theaters like this solve acoustic problems?
First, the basic acoustic requirements of small private home theater
The acoustic aspects of small private home theater design need to meet objective technical indicators and subjective technical indicators, while the subjective technical indicators including acoustic evaluation are divided into:
1, no obvious acoustic defects
2, accurate tone reduction
3, balanced sound
4, clear language dialogue
5, clear music playing
6, accurate sound image positioning
7, the real sense of space surround
8, a vivid sense of presence
In terms of acoustic indicators, the following points are critical:
One is that the background noise does not exceed 35dB (A), including under normal operating conditions of air conditioning equipment, ventilation equipment and projection equipment.
The second is the air sound insulation requirement. When the sound source emits 90dB (A) or more of pink noise in a private home theater, the sound pressure level difference from the adjacent sensitive room (horizontal and vertical) is not less than 45dB (A).
The third is that the reverberation time of each frequency band follows a certain index, and the room below 200 square meters, the reverberation time is controlled between 0.15-0.35 seconds. The reverberation time frequency characteristics of each frequency band should be within the standard range, the intermediate frequency requirement is straight, the low frequency can be slightly higher, and the high frequency can be slightly lower, but should not exceed the upper and lower limits.
The fourth is the difference between the maximum and minimum octave sound pressure levels in the range of 100Hz-4000Hz in the viewing area during normal screening, which should not be greater than 6dB, and the difference between the maximum value and the average value should not exceed 3dB.
The fifth is that in terms of optics, the exterior finish material, texture and color are elegant. Under the premise of conforming to the principle, the user's preference for color is met, which meets the user's psychological requirements. The color tone of the interior decoration should meet the audio-visual needs of private home theaters and should not affect the effect of viewing. The color of the main body can be dark or gray, and it is not suitable to choose light or white.
Second, to create a private home theater and KTV space considerations acoustic processing skills
In the process of creating a private home theater and KTV space, how to transform some key elements, and can be carried out in relative savings?
To create a room combining traditional KTV with a private home theater, pay attention to the following issues in acoustic processing:
One: Jiansheng treatment: avoid excessive hard surface-based decorations, such as large-area glass, stone, etc. This decoration is too strong for high-frequency reflection, which will affect the clarity of multi-channel cinema sound. Increase soft sound-absorbing sound absorbers, such as soft bags, fabric sofas, etc., to reduce high-frequency reflections. If the diffuse reflection type diffuser and the corner low frequency trap and other sound building devices can be properly used, the effect is better. There are also sound insulation effects such as doors and windows to be taken into account, so as to avoid the sound leakage affecting the viewing effect of the adjacent room.
Avoid the use of large areas of glass and stone, and use fabric and soft bags.
Second: speaker placement and high-frequency compensation: private home theater multi-channel speaker placement, try to follow the principle of the speaker's positive axis aligned with the listening area, so as to ensure the sound details and sound field reduction. If the speaker position needs to be placed in a higher position due to conditions, try to use an adjustable angle bracket to point the horn of the horn to the listening area, and match the AV receiver with automatic tuning function (such as DENON Tianlong AVR). Series), frequency calibration to compensate for the high frequency response of the loss.
Third: the bass position and adjustment: the private home theater ultra-low speaker position should be as close as possible to the front main channel speaker, which is conducive to the phase connection between the low frequency and the main speaker, improving the clarity and strength of the low frequency. Try to avoid placing the subwoofer in the listening area next to the sofa and away from the main channel, which will increase the difficulty of sound adjustment. If there is a serious low-frequency standing wave in the room, you need to increase the low-frequency trap; if there is low-frequency offset, the side needs to reduce the large hollow objects (such as cabinets, empty walls, etc.) that exist in the room, and cooperate with the AV with automatic tuning function. The receiver performs frequency calibration to reduce the impact.
Fourth: Optoelectronic system isolation: If the room has strobe lights, laser lights and other effects lamps in use, then it is necessary to pay attention to separate the lamp circuit and the audio circuit, not the same phase in the power supply line, to avoid the pulse generated when the lamp is used. Interference with the home theater sound system.
Third, audio equipment for the acoustic application of private home theater
Multi-functional private home theaters need to be more perfect for the functions of watching and singing K, but not just one link. KTV is usually dominated by singing, and the film requires both large dynamics and detailed expressions, while traditional KTV speakers are not fully satisfied. Because the room where you sing K wants to watch movies, you need to add bass and center. For the requirements of low frequency dynamics and vocal dialogue, there is a big difference between KTV and KTV. Then you need to adjust the corresponding acoustics, including the sound insulation of the room. Sound absorption and so on are also. Acoustic treatment and modification of cavity, diffusion, sound absorption, etc. can usually be performed according to the situation of the room.
In terms of home theater equipment, because KTV and cinema have their own characteristics and differences in sound focus, many practical solutions use two systems and equipment, which cannot be compatible.
Fourth, to solve the sound needs of multi-functional private home theater with professional systems and equipment
From a strict technical point of view, KTV and theater have different reverberation time for space, which is different. However, the impact is not too obvious from the user's perspective. However, in terms of systems and products, the division of labor in the world is very clear. The home theater audio system is a spacious, delicate and clear sound that focuses on the cinema effect. The KTV sound system focuses on energy, sound pressure level, and lacks many details. .
High-quality systems and equipment can satisfy the effects of singing K and watching movies.
5. Singing and watching movies are two different experiences.
Singing K and watching movies are completely different sound experiences, and all require a very special difference in design.
Singing and watching are two different experiences, with a strict distinction between space environment and technology and equipment.
First of all, the layout of the room is difficult to coordinate. Generally speaking, the traditional KTV rooms are all enclosed, horizontal and short, often 3 meters away. Private home theater requirements are vertical, and the distance required for viewing is 4-5 meters. It is a TV set for singing, and a projector for watching movies. The equipment such as speakers and controls are also different. And KTV rooms generally go to 120dB-130dB, it is difficult to completely soundproof, which will have an impact on the room next to it.
Of course, the current practice of some users is to distinguish between KTV and private home theater. Some rooms are karat, and some rooms are watching. The rooms are independent, each using different systems and equipment, so there is no such entanglement in the acoustic processing. This may also be one of the best ways to get a KTV and cinema in the future.
Separating the K song room from the viewing room should be a more feasible way.
Acoustic technology issues in small private home theaters are a fundamental discipline for the audiovisual industry. There are also issues such as subjective and objective conditions between theory and application. Is the use of systems and equipment to achieve the integration of viewing and singing K, or is the theater and K-room completely independent? Two options, which one do you agree with?
Of course, for the technical points of the construction and acoustic processing of small private home theaters, the current audio-visual industry is still based on the accepted THX technology theory at home and abroad.
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.
Note: This article is transferred from Solan. The article is an independent view of the author and does not represent the position of the home theater network.
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