The playback system of the home theater system, which is often said by people, consists of four major parts: audio and video players, AV decoding and power amplifiers, speakers and video equipment systems. The four lacked any playback system that could not be called a home theater. The home theater audio system we are going to introduce today is only part of the home theater. It is mainly composed of power amplifiers and speaker systems. However, in the installation guide, we will set up a complete home theater system for everyone.
AV power amplifier selection
As the name suggests, A (audio) means audio and audio, and V (video) means audio and image. Therefore, the AV amplifier is an audio-visual amplifier that combines audio and video processing. It emphasizes the atmosphere of the sound field and is dedicated to home theater. Mainly composed of signal source selector, signal processing preamplifier and post-stage power amplifier, it can switch signal source, process signal, and finally drive multiple speakers through power amplifier, generally with front, center, surround, etc. 4 to 7 Output of channel power, with Dolby Pro Logic Surround Decoder or AC-3 decoder, DSP digital sound field processing, FM/AM digital tuning, and a variety of audio and video input and output interfaces, like Axis, fiber, HDMI interface, etc. Home theater network shopping guide network welcomes you!
How to choose AV power amplifier
The AV amplifier is the core of audio playback and functions as a multi-channel sound playback function. When it comes to multi-channel playback, it is inseparable from the standard of surround sound. When choosing an amplifier, be sure to pay attention to whether the amplifier has the popular surround sound standard certification: 1. Dolby prologic surround sound. 2. Dolby Digital surround sound. 3, DTS surround sound. 4. THX Surround EX surround sound (7.1 channels). 5, DTS-ES Discrete surround sound (6.1 channel) and so on. A home AV amplifier must have at least the decoding and playback function of Dolby Digital Surround, because Dolby Digital is the mandatory audio standard for PAL DVDs specified by the DVD Alliance in December 1997. Whether the AV amplifier has this function is the user. The basic point of choice. Other certifications are a direct manifestation of this amplifier level.
In addition to the obvious certification, there are many indicators and parameters to evaluate the quality of an AV amplifier.
1. Output power: refers to the energy obtained by the speaker connected to the power amplifier. For the power amplifier, its rated power (the effective value power that can be continuously output under the condition of no distortion) is an effective indicator for evaluating the performance of the power amplifier.
2. Distortion: The output of the device cannot completely reproduce its input. The distortion of the waveform or the increase or decrease of the signal component is called distortion. The smaller the distortion of the power amplifier, the better the sound quality.
3. Dynamic range: The level difference between the strongest part and the weakest part of the signal. For the equipment, the dynamic range indicates the ability of the equipment to respond to strong and weak signals.
4. Damping coefficient: The damping coefficient is the ratio of the load impedance to the output impedance of the amplifier. It is a performance index for measuring the damping effect of the internal resistance of the power amplifier on the speaker.
5. Output impedance: The output impedance of the power amplifier refers to the equivalent internal resistance of the output terminal to the speaker. It should be consistent with the rated input impedance of the speaker.
6. Signal-to-noise ratio: The signal-to-noise ratio refers to the decibel difference between the audio signal level and the noise level. The higher the signal-to-noise ratio, the smaller the relative noise of the amplifier and the better the sound quality.
7. Separation: Separation refers to the ability of a surround sound decoder in an AV amplifier to restore an audio coded signal to each channel signal. A power amplifier with poor resolution may have poor sound image localization, insufficient sound field, and poor sound image continuity.
Perhaps these indicators make ordinary people puzzled. The simplest point is the driving ability (that is, the power) and the weight of the amplifier. Although the relationship between output power and driving force is not so direct, but has a relatively close relationship, the output power is easily found from the indicators in the specification, 100W, 200W, 400w or more, but the driving ability sometimes needs to be These indicators are behind the real listening to have a real say. This is to mention the choice of the speaker, the latter power amplifier is driven for the speaker, the stronger the driving ability, the more able to control the speaker, the more convenient the power output, the more potential the speaker can be discovered, so the United States The AV amplifiers are as large as the cars they produce, and the high-powered low-impedance sound is more than enough. However, the AV amplifiers produced in Japan occupy more than 80% of the market, which also explains the uniqueness of its technology. Therefore, it is important to use high-power post-stage power amplifiers in exchange for more comfortable control and instantaneous dynamics. a little. Speaking of the weight of the amplifier is perhaps the most easy to perceive, because the power amplifier needs a strong power supply support, so the heavier the power amplifier, the larger the transformer index of the power supply equipment or the use of larger capacitors, these are the guarantee of the quality of the power amplifier, and the power amplifier The heavier the stability, the better the sound quality can be avoided by unnecessary vibration.
Speaker system selection
The speaker, also known as the speaker system, is the end of audio playback and is the most neglected part of the home theater system, because the sound quality of the speakers has a great impact on the entire sound system. A good speaker involves acoustics. Electromagnetism, mechanics, materials science and many other disciplines are the key to affecting audio playback. It's not just a few pieces of wood with a few speakers and capacitors that can be called a speaker. In the home theater system, the subwoofer has a vital position. The subwoofer can enhance the bass effect. The most powerful subwoofer can well represent the bass below 100Hz, and it is also an important output terminal for the listener to shock. Welcome to the home theater network shopping guide network!
The most ideal home theater speakers, in addition to providing subwoofers that shake the bass, the sound of each speaker must be consistent - the main speakers on the left and right sides of the listener have the highest requirements for sound quality playback, the center speaker and The surround speakers on the rear can be slightly worse than the main speakers, but must match the tone of the main speakers. Speakers with good diffusibility are more practical. During the purchase process, you should listen as much as possible and compare them. You can find the different characteristics of each speaker through careful listening to low, medium and high frequency sounds. In addition, in the process of purchasing, we must also pay attention to the fact that most speakers can not balance the dynamic and meticulous sound quality. The speakers suitable for music appreciation are often delicate and dynamic, and are specially designed for the music of multi-channel AV speakers used in home theaters. The tone is often unremarkable. If the two are taken into consideration, it is a high price. Therefore, in the purchase of home theater speakers must all give up, it is impossible to take care of both at the same time, but also to match the corresponding AV amplifier to match the speaker to play the maximum power of the speaker to achieve the maximum sense of dynamic audio and video effects.
Performance indicators of the speaker system:
1. Frequency response (effective frequency range): This indicator reflects the main frequency range of the speaker operation. The wider the range, the better the sound reproduction characteristics. Generally, the frequency response of the high-fidelity speaker box is 20-30KHz, which is lower than 20Hz. Sound people can hardly perceive through the ears and can only be felt through other organs.
2. Rated impedance: refers to the impedance value measured at the input end of the speaker at a certain working frequency (intermediate frequency). The rated impedance given by the manufacturer is usually the impedance modulus at which the maximum work is obtained in the rated frequency range. The rated impedance is generally specified as 4 ohms, 8 ohms, 16 ohms, 32 ohms, etc., and 3 ohms and 6 ohms are also used abroad.
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