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Grow Bulb Horticultural Grow Bulb ,Led Grow Light Par,Indoor Grow Bulb,Indoor Plants Grow Bulb Shenzhen Wenyi Lighting Technology Co., Ltd , https://www.wycngrow.com With the improvement of people's living standards, it is no longer a luxury to enjoy cinema-quality audio-visual movies at home, but how to move the theater's audio system into your home is a big problem for many friends. Today Let's take a brief look at the home theater audio system purchase and installation guide, to help those who are ready to improve the sound quality of their ears.
Home theater basics
First of all, we must first introduce the home theater system. Home theater system, English Speakers, A/V & Home Theater. The home theater system is an audiovisual system that enjoys movies and enjoys music in a family-like environment. The home theater system allows users to enjoy movies that surround the cinema at home, listen to the sound quality of professional-grade audio, and take care of the general karaoke entertainment equipment system. In general, a home theater requires three parts: signal source (Blu-ray player, DVD player, HD player, HTPC, CD player, etc.), power amplifier and terminal output device (projection, HDTV, hi-fi speaker) Wait).
The playback system of the home theater system that people often say is mainly composed of three parts, namely audio and video player, AV amplifier and speaker system. The three lack any playback system that cannot 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 for the speaker to drive, the stronger the driving ability, the more able to control the speaker, the more powerful the power output, the more potential of the speaker, 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.
3. Power: The power level of the speaker is one of the important indicators for selecting a speaker. The nominal power of a typical loudspeaker is rated power. Rated power or rated noise power is the input power when the speaker can work continuously for a long time without generating abnormal noise.
4. Sensitivity: Characteristic sensitivity refers to the sound pressure level measured at 1m in the axial direction when the speaker is added with a pink noise signal voltage equivalent to 1W of the rated impedance. The sensitivity of a speaker has no decisive influence on sound reproduction. Because people can get enough volume by adjusting the output of the amplifier. However, in the speaker production, the sensitivity of the speaker is a parameter worthy of attention. The sensitivity of each speaker unit in the frequency band that is responsible for playback must be basically the same, so that the whole speaker is balanced in high, medium and low sound during playback. Especially for stereo speakers, the units used in the left and right channels must be strictly screened and matched. It is required that the output sound pressure level difference of the unit used for the left and right channels should be within plus or minus 1 dB, otherwise the sound image will be affected. The sensitivity of professional speakers is above 95dB/mw, even as high as 120dB/mw. The sensitivity of the home speaker is small, and it can be 92dB/mw even if it is very large.
5. Directivity: Directivity is used to describe the ability of a loudspeaker to radiate sound waves into all directions of space.
6. Distortion: The distortion of the speaker system includes chopping distortion, intermodulation distortion and transient intermodulation distortion. The distortion characteristics of the speaker are more likely to cause deterioration of the characteristics than a single speaker.
These indicators still make us scratch our heads. While observing the parameters of the speakers, audition is an indispensable part of the purchase of speakers. By using the audition CD or part of the professional audition, the audition can be the most important means of sound. Make full use of your own hearing and the ability to perceive the speakers, feel the dynamic analysis of the speakers, the impact is the king of the choice of speakers, when you buy a home theater speakers, you can choose such as: "U571", "Pearl Harbor" The overall effect of Hollywood blockbuster speakers such as "Iron Man" and "Transformers".
Speaker notes
1. The general new speaker needs to be used after a period of running-in to achieve its excellent performance. This is called “煲â€. Otherwise, its playback sound will appear too hard and too bright, or can not be opened, this time process can be very different for different speakers, ranging from tens of hours to dozens of days, "ç…²" speakers are not It is necessary to use audio such as professional white noise, and it can also achieve the effect of “煲†directly through use.
2, small bookshelf speakers due to physical space constraints, its bass dynamic range can not be too large, so even if its low frequency extends very low, its practical significance is not large, visible low-frequency lower limit of the pursuit of small speakers, the actual The effect is not ideal.
3, the box we usually say is a good push, is also an indicator that we need to focus on the purchase of speakers. The nominal impedance of the speaker is usually 4Ω and 8Ω. The speaker with 4Ω impedance has higher requirements on the power amplifier. Although the power amplifier can output more power, the output current capability of the power amplifier is required because the impedance is low. Higher, this is why some power amplifiers with insufficient power supply margin tend to cause increased distortion, and low-impedance speakers are detrimental to damping, which affects low-frequency control. In addition, the impedance of some speakers may be reduced to less than half of the value for some frequencies during actual operation, so it is better to select a speaker with an impedance of 8 Ω.
Home Theater Installation Guide
We have already said that a home theater includes: signal source (Blu-ray player, DVD player, HD player, HTPC, CD player, etc.), power amplifier and terminal output device (projection, HDTV, hi-fi speaker, etc.) In addition to the acoustic treatment of the house, we will not briefly describe the installation method of the home theater system.
Signal line and connection selection
Audio/video signal: HDMI cable
Audio signal: digital fiber line, digital coaxial line, analog audio line
Video signal: Component Video color difference / component line, S-Video S terminal line, Composite Video composite video line
1, audio signal transmission: HDMI, fiber, coaxial connection is recommended. HDMI has a large bandwidth and can transmit HD audio signals. However, the source of Blu-ray or high-definition movies output from the player, I recommend using HDMI or fiber optic output to the power amplifier. Compared with the coaxial line, the signal transmission speed is faster and more. Directly, the effect of pushing the amplifier to the speaker will be more obvious and bursting. If there is a certain requirement for music, it can be replaced by coaxial transmission, and the sound quality of the music will be relieved.
2, transmission video signal: recommend the popular HDMI cable, HDMI bandwidth is large, can transmit high-definition 1080P HD signal, but need projection or TV interface support. The color difference/component line supports up to 720P HD signals, and the rest of the wires are not recommended.
General video connection: video output device (Blu-ray player, DVD player, HD player, HTPC) → HDMI cable → Amplifier → HDMI cable → TV / projector.
Simple video connection: video output device (Blu-ray player, DVD player, HD player, HTPC) → HDMI cable or color line → TV / projector
Sound system connection
Since the general home theater X.1 speakers are passive, they are driven by the power amplifier unit. Therefore, in addition to selecting the appropriate power amplifier, the choice of audio cable is also very important. Only when the road is smooth and undisturbed can it be ensured. The quality of the transmitted signal. Now there are more optional wire brands on the market, such as foreign time-space, line holy, supreme, Yabao, etc., domestic Huamin is also good, and try to choose the DC resistance as small as possible, the higher the pure copper Good and better than 2.5 square meters of wire, the brand's finished line and scattered line are optional and not difficult to make. Wire investment should be degree, the investment ratio should generally not exceed 20% of the total audio, not too cheap to affect the quality of audio and video and there is no need to "fever".
General audio connection method:
Video output device (Blu-ray player, DVD player, HD player, HTPC) → HDMI cable or fiber (coaxial) → amplifier → speaker / subwoofer.
The connection is only the basis of the home theater system. It can be heard. It can be seen that the picture is half of the success. How to debug, how to do the simple operation of the audition structure in the house is also an important part.
X.1 speaker placement requirements:
The main speakers and surrounds need to be audited many times or with professional equipment to achieve the best results, but the general family experience and equipment are limited, but we can also achieve better audiovisual effects through some simple methods, first The two main speakers must be on the same level. Generally, the excellent speakers do not need to face the listener. They only need to be placed in parallel. The listener should ensure a better stereo effect in the superimposed area of ​​the two speakers. Surrounding in the establishment of home theater system is also an indispensable part, 5.1 or even 7.1 THX standard needs to have higher requirements for surround, because the surrounding speakers are generally bookshelf, so if the surround is supported by the bracket, the general speaker height is slightly It is higher than the height of the ear when the listener is sitting. If it is a wall-hanging method, the angle of the surrounding can be adjusted appropriately to match the directivity to achieve the best surrounding effect. The center is mainly used in the X.1 system to play the replay function of the movie dialogue, etc. It is recommended to place it under the TV or the projection, and the angle is slightly raised. If there is a condition and it is the projection method of the translucent curtain, Placed in the back of the curtain will be the best choice.
Subwoofer placement and commissioning:
The subwoofer is a particularly important aspect of the home theater system. Since the subwoofer emits low-frequency sound and the sound has poor directivity, the placement of the subwoofer is low, but since it mainly works at low frequencies, it is recommended. The subwoofer can be placed on the floor of marble or tile to increase the sense of dive and speed. When placing the subwoofer, be careful to avoid resonance and affect the sound quality.
Home decor enhances sound:
In the ordinary family, the living room is generally used as a simple audio-visual room. The structure of the house and the interior furnishings will have a bad influence on the sound effect. The decoration or addition of some simple items will improve the sound effect. First, due to the living room. It is relatively empty, and the house has a large reverberation. It is necessary to make certain indoor attraction through some decorations. For example, carpets are laid on the ground, especially the tiles, and some decorations are placed on the walls. The corners of the houses are made of some large green plants. These are some methods to prevent audio reflection. Some items that increase indoor sound absorption can absorb the sound energy in the room, reduce the reverberation time, and reduce the indoor noise to reduce the reverberation and improve the sound effect.
Of course, if you consider the audio-visual effect to complete the sound absorption and diffusion of the wall ahead of the renovation, it will achieve the cinema-level effect, but the engineering and cost are still unacceptable to ordinary families. 
November 06, 2020