How can I make the sound effect of the home theater the best?

                       How can I make the sound effect of the home theater the best?

1. General principles of equipment selection

The most basic features of a home theater are: a large screen with high-definition pictures and high-fidelity surround sound effects.

The core of the home theater system is the surround sound decoder, which can be built into the source equipment or AV amplifier, or it can be independent. For the convenience of connection and use, the family usually chooses a built-in signal source (such as a laser disc player) or an AV power amplifier, but if it is not necessary for equipment configuration, generally do not choose a built-in signal source decoder but a built-in AV power amplifier. The decoder, because the former cannot compare with the latter in terms of the convenience of line connection and performance.

When purchasing equipment, it is necessary to take into account the investment proportion of the entire home theater. The general point of view is that in a home theater, the audio and video equipment affects the sound quality as follows: speakers account for 50%, AV amplifiers account for 30%, and signal sources account for 20%. This cannot be used as a standard, but it can be used as a reference.

2. Selection of AV amplifier

(1) Buy brand-name products AV amplifiers are an important part of the home theater system, and you should try to choose products with high technical indicators and excellent performance. When purchasing, try to go to a reputable merchant and choose a well-known brand product.

(2) Determine the type of built-in decoder AC-3 has begun to be widely used with the recognition of the world film industry, and its software DVD discs have gradually matured and will become the mainstream of the market. Buy an AV amplifier with a built-in AC-3 decoder It is the need to follow the trend. But DTS is a surround sound system with more advantages than AC-3 to some extent, and the number of software is increasing. Therefore, it is a more ideal choice to purchase an AV amplifier with built-in AC-3 and DTS dual decoders.

(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 for the actual use of the speaker. Usually, 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. If the output power is too high, it will cause unnecessary waste; if the output power is too small, there will be a small horse-drawn cart, so that the speaker cannot get enough driving power, and the entire audio system cannot play the best sound effect. .

How to determine the required output power when choosing an AV amplifier? The output power of the power amplifier should be determined according to the size of the listening environment, sound absorption conditions and the sensitivity of the speakers used. The output power required in actual use is often much smaller than the theoretical calculation value. If the volume control knob of the power amplifier only needs to be rotated to 1/3 of the maximum volume during use, the volume reproduced by the speaker can meet the actual listening requirements. If it is needed, it means that its output power can meet the requirements of use, and the selection is more appropriate.

The function and adjustment of AV amplifier

In order to facilitate heat dissipation, the heat dissipation holes on the amplifier should be kept unobstructed, and should not be placed overlapping with other audio and video settings used in the home theater system; for multi-channel AV amplifiers with decoders, its use and adjustment are more complicated. The system cannot work normally, not because there is a problem with the matching of the system hardware, but because of the improper use and adjustment of the system, the problems mostly occur in the following aspects:

1. Correctly connect all components

There are many input and output terminals of the AV amplifier. When wiring with various signal equipment and speaker systems, it is necessary to ensure that all connections of each audio component and video component are correct, such as L (left) to L (left), R (right) to R (Right), "+" vs. "+", "-" vs. "-". Some components need to be connected with different connection methods and the terminal names are also different, such as COAXIAL (coaxial), OPTICAL (optical), S-VIDEO (S video), VIDEO (video), AUDIO (audio), etc., each The terminals are different from IN (input) and OUT (output). It is necessary to ensure the correct connection between different types, input and output terminals, which is the prerequisite for the normal operation of the system.

2. Correctly select and set the 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 movie interplay system), etc., depending on the type of program source to be played Only by choosing the input mode correctly can the system perform at its best. The preferred order of signal selection is: digital signal encoded with Dolby Digital or DTS → ordinary digital signal (PCM) → analog signal (ANALOG); when the input mode is set to AUTO (automatic) position, the input from the signal source Signals are selected in the following order of priority: COAXAL (coaxial) terminal → OPTICAL (optical) terminal → ANALOG (analog) terminal. Note: Some modes are mutually restrictive. Improper selection will cause the system not to work normally. Be sure to read the instruction manual carefully before using the amplifier.

(2) Selection of sound effect mode To use the EFFECT (sound effect) switch correctly. When the system is playing standard stereo sound sources such as CD records or dual-channel tapes, it is best to turn off the sound effect speakers (center and rear) to get the original sound field effect; also when enjoying movies or playing encoded program sources Correctly choose the sound processing program:

PROLOGIC, AC-3, DTS or various CINEMA DSP (Digital Audio Processor for Movie Theaters), whether the choice is appropriate is very important for whether it is appropriate or not, and whether it can have a good surround sound effect.