1. General principles of equipment selection
The most basic features of a home theater are: large-screen high-definition graphics and high-fidelity surround sound.
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.
The role and adjustment of the 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, correctly connect the various components
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, 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 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. More fresh and fun home theater information, please pay attention to home theater network (WeChat: cnhifi) http://, the country's most influential home theater audio player interactive media website.
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