As the saying goes, three-point equipment, seven-point environment, the first is to buy suitable home theater equipment ("Old Snail teaches you to match the budget allocation of home theater"), and then create a perfect audio-visual environment ("Old Snail: Chat Home theater decoration acoustic treatment of that thing"), but we often forget the great role that equipment debugging can play, the same set of sound, debugging can play 200% of the performance, debugging is not good even half of itself The effect of this can not be seen, this sentence projector is also applicable, today we will talk about how to debug and enhance the home theater sound effects.
1. General principles for the selection of home theater equipment
The most basic features of a home theater are: large-screen high-definition graphics and high-fidelity surround sound. AV or PDVD laser disc players are preferred for audio and video playback equipment. AV amplifiers should be equipped with surround sound amplifiers with independent 5.1CH input/output terminals and amplifier circuits. The speaker system should have at least five L, C, R, SL, SR or L, C, R, SL, SR, SUB six speakers.
At the heart of the home theater system is the surround sound decoder, which can be built into the source device or AV amplifier, or it can be independent. For the convenience of connection and use, the family usually chooses to be built in the signal source (such as laser disc player) or AV amplifier, but if it is not necessary for the equipment configuration, generally do not choose the decoder built in the signal source and should choose to be built in the AV amplifier The decoder, because the convenience of the line connection or performance, the former can not be compared with the latter.
When purchasing equipment, it is necessary to take into account the proportion of investment in the entire home theater. The general view is that in home theaters, the impact of audio and video equipment on sound quality is: 50% for speakers, 30% for AV amplifiers, and 20% for signal sources. This cannot be used as a standard, but it can be used as a reference.
2, AV amplifier purchase
(1) Buying brand-name products AV amplifiers are an important part of home theater systems. Products with high technical indicators and excellent performance should be selected as much as possible. When purchasing, you should try your best to get a reputable business and choose a branded product with a certain reputation.
(2) Determining the type of built-in decoder AC-3 has been widely used with the recognition of the world film industry. Its software DVD disc has matured and will become the mainstream in the market. AV amplifier with built-in AC-3 decoder is available. It is the need to adapt to the trend. However, DTS is a somewhat superior surround sound system than AC-3, and the number of software is increasing. Therefore, it is more ideal to purchase an AV amplifier with built-in AC-3 and DTS dual decoder.
(3) It is very important to choose the appropriate output power. The rated output power of the AV amplifier should be determined according to the driving power required by the actual use of the speaker. Generally, the output power of the AV amplifier should be 1.5~2.0 of the rated power of the speaker used in the system. Times. The output power is selected too much to cause unnecessary waste; if the output power is too small, there will be a situation of small horse-drawn carts, so that the speaker can't get enough power to push, and the whole sound system can't exert the best sound effect. .
How to determine the required output power when selecting an AV amplifier? The power amplifier output power should be determined according to the size of the listening environment, the sound absorption conditions, and the sensitivity of the speakers used. In actual use, the required output power is often much smaller than the theoretical calculation. If the power amplifier's volume control knob only needs to be rotated to 1/3 of the maximum volume, the volume reproduced by the speaker can satisfy the actual listening. If necessary, it means that the output power can meet the requirements of use, and it is more suitable.
3, the role and adjustment of AV amplifier
To facilitate heat dissipation, the vents on the amplifier should be kept clear. Do not overlap with other audio and video settings used in home theater systems. For multi-channel AV amplifiers with decoders, the use and adjustment are more complicated. The system does not work properly. It is not a problem with the system hardware matching. It is caused by improper use and adjustment of the system. The problems occur in the following aspects:
1) Connect the components correctly
There are many input and output terminals of the AV amplifier. When wiring with various signal devices and speaker systems, you must ensure that all audio components and video components are connected correctly, such as L (left) to L (left) and R (right) to R. (Right), "+" vs. "+", "-" vs. "-". Some components need to be connected by different connections and the terminal names are different, such as COAXIAL, OPTICAL, S-VIDEO, VIDEO, AUDIO, etc. The terminal has the difference of IN (input) and OUT (output). It must ensure the correct connection between different categories, input and output terminals. This is the prerequisite for the normal operation of the system.
2) Correct selection and setting of working mode
(1) Input mode (INPUT MODE) selection amplifiers generally have a variety of input modes to choose from, such as AUTO (automatic), ANALOG (analog), DTS (digital video system), etc., depending on the type of program source being played. The input mode is chosen correctly for the system to perform at its best. The preferred sequence of signal selection is: digital signal encoded with Dolby Digital or DTS → normal digital signal (PCM) → analog signal (ANALOG); input from the signal source when the input mode is set to the AUTO position The signals are selected in the following order of priority: COAXAL (coaxial) terminal → OPTICAL (fiber optic) terminal → ANALOG (analog) terminal. Note: Some modes are mutually restricted. If you choose improperly, the system will not work properly. Be sure to read the instruction manual carefully before using the amplifier.
(2) Selection of sound mode To use the EFFECT switch correctly. When the system plays a standard stereo sound source such as a CD record or a two-channel tape, it is best to turn off the sound speakers (center and rear) to get the original sound field effect; also when watching the movie or playing the coded source Choose the sound processor correctly:
PROLOGIC, AC-3, DTS or a variety of different CINEMA DSPs (shadow theater digital sound processors), whether the choice is right, for the right, is essential for a good surround sound.
4, home theater audio settings and adjustments
When the home theater system works in surround sound mode, the effect of the surround sound field is not only related to the quality and performance of the speaker system itself, but whether it is correctly set and adjusted is also an important factor that cannot be ignored.
(1) Setting the operating mode of the speaker According to the size of the system (speaker), whether or not the center speaker (CENTER SP), rear speaker (REAR SP), main speaker (MAIN SP), and subwoofer output are correctly set. (BASS OUT), put it in the right working condition. There are three types of center speaker operating modes (CENTER MODE): normal (NORMAL) mode - suitable for small size and moderate performance of the center speaker; wide (WIDE) mode - suitable for center speakers and The front main speaker band, the load power and other indicators are equivalent; PHANTOM mode - this mode is used when the system does not configure the center speaker. In some AV amplifier instructions, the above three modes are often referred to as SML (small speaker), LRG (large speaker), NONE (no speaker), but the selection principle is the same as above. Similarly, the main and rear speakers also have to choose the right mode of operation based on their size and performance. The subwoofer channel is available in two different modes depending on whether or not the subwoofer is connected. In addition, there are two working modes: 3CH (three-channel mode) - omitting the surround back speakers, leaving only the front and center speakers: OFF mode - the center and surround channels are off, no output, suitable for Play standard stereo sound sources, such as CD discs.
(2) Speaker volume balance adjustment (output level adjustment) Adjusting the output level of each channel to balance the power of each speaker is a key step to achieve the best overall sound. Adjust with the test audio signal: Set the total volume control to 1/3, and set the BASS, TREBLE, and BALANCE controls to the “0†position to turn on the test signal ( Press the “TEST†button), the test audio signal (like random noise) will be heard from each speaker in the following order: left main speaker→center speaker→right main speaker→right rear speaker→left rear Set the speaker, adjust the output level of each channel to match each other, that is, the sound level of each speaker is balanced. An AV amplifier without a test signal can be adjusted using a feature film with surround sound, the basic process is the same as above. Genuine multi-channel encoded DVD discs currently on the market are often accompanied by test audio signals.
(3) Adjusting the loudness Listening to surround sound To achieve a satisfactory presence, you must have enough loudness, a loudness comparable to real sound. The method of adjusting the loudness is as follows: first adjust the level matching of each channel, select a film with only dialogue, adjust the main level of the system (MAINLVL), and make the whiteness of the total volume control knob at a lower position to a suitable degree. Amplifiers without main level adjustment can only control the loudness with the total volume knob. Of course, to achieve a certain degree of loudness, there are certain requirements for the power amplifier configuration (power of each channel). In order to achieve better cinema effects, it is advisable to turn the volume slightly larger.
5, delay time and dynamic range adjustment
When using a processor such as Dolby Pro Logic, Dolby Digital or DTS Decoder, you can adjust the delay time between the main sound and the sound effect according to your preference, that is, adjust the start time of the main speaker and the sound of the rear speaker sound. The time difference between the start times to get the sound field effect that suits you.
In short, to make the sound of the home theater system "squat", it is necessary to properly match the system equipment, but also to use and adjust correctly. To some extent, proper operation and adjustment of the various devices in the system is more important than equipment selection. No matter how good the equipment is, the sound effect is not as good as a set of ordinary equipment. More home theater technical information, welcome to pay attention to home theater network WeChat: cnhifi.
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