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Home Theater Amplifier Selection Standard
1, the output power: refers to the power amplifier is connected to the speaker on the energy obtained, for the power amplifier, the rated power (power on the conditions of distortion can be continuous output of the RMS power) is to evaluate the performance of the power amplifier is an effective indicator.
2. Output impedance: The output impedance of a 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. 
3. Signal to noise ratio: Signal to noise ratio refers to the decibel difference between the audio signal level and the noise level. The higher the SNR value, the smaller the relative noise of the amplifier and the better the sound quality.
4. Dynamic range: The level difference between the strongest part and the weakest part of the signal. For the equipment, the dynamic range indicates the equipment's ability to respond to strong and weak signals.
5. Degree of separation: The degree of separation refers to the ability of a surround sound decoder in an AV amplifier to restore an audio coded signal to individual channel signals. Power amplifiers with poor resolution will suffer from inaccurate sound image localization, lack of sound field, and poor sound and image continuity.
6. Damping coefficient: It refers to the ratio of the load impedance and the output impedance of the amplifier. It is a performance index that measures the magnitude of the damping effect of the internal resistance of the amplifier on the speaker.
7. 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 amplifier, the better the sound quality. 
Home theater amplifier purchase considerations
First, decoding capabilities.
The power amplifier's decoding capability is of primary concern and must be considered together with the selected player. Decoders in home theater amplifiers mainly include three basic movie sound decoders: directional logic decoder, digital Dolby AC-3 decoder and DTS 5.1 channel decoder.
In the more upscale home theater amplifiers, there are three new types of decoders: the Dolby Digital EX extension, the DTS-ES Matrix, and the DTS-ES-Descrite. If you buy a DVD, you can only use it if you only pursue a clearer picture and do not care about the positioning ability of the rear sound field. At present, this audio and video amplifier is very cheap. If the DVD players use DVDs and they want to have authentic 5.l channels, there will be more tricks.
Second, the power size 
Power is the main indicator of power amplifiers, and has a great relationship with the selling price. But in fact, when the home is used, the actual power is below 2w. The power of any audio and video amplifier is rich. The reason why inferior amplifiers are so low is that they only make one or twenty watts inside, and they dare to label 50W and 100W, knowing that you will not use such a high price. The power is large, but there is no distortion in the occasional extra loud sound, that is, the remaining margin is large. Purchasing home theater amplifiers does not need to consider power enough.
If the volume of the five speakers that are provided with them is not the same size, but the two most common ones are small and small, the requirements for equal power and full frequency band do not need to be constrained.
Third, control ability
Home theater amplifier control is also very important. In addition to the overall volume adjustment, the amplifier must have five independent volume adjustments. Rarely have a center volume; the front right and left and right surround sounds are independently adjustable, plus front left and right front balance and left and right surround sound balances. There are a total of five adjustable controls. Otherwise, the five-way volume cannot be adjusted and it will be inconvenient to use.
The center channel and surround channels should also have delay adjustments to accommodate different distances between the speakers and the audience. And these kinds of adjustments should be able to use remote control. Because the debugger should listen to the normal listening position, there is no need to use the remote control to walk around, it is difficult to adjust.
Fourth, audio and video interfaces.
There are a large number of audio and video input and output interfaces on the back of high-end home theater amplifiers. Many interfaces can be connected to the picture source audio device. In terms of audio, audio and video amplifiers with digital decoding capabilities must have digital interfaces; they can be used independently as multi-channel amplifiers and should have a set of 5 channel interfaces. If digital ripping is to be done in the future, digital outlets are also required.
Fifth, 0.1-channel and virtual surround sound. 
It is irrelevant whether there are 0.1-channel power amplifiers on the amplifier, and it is generally more convenient to use active speakers. The human ear is less sensitive to bass, and the power of a bass channel amplifier should be higher than that of several other channels.
Some 0.1-channel amplifiers in home theater amplifiers are used when two stereo sets are successfully used as midrange and surround channels, leaving them to the subwoofer. The power distribution is not reasonable at first. The virtual surround function is a technique that was previously used when only two speakers were used to simulate multiple channels. Now that the sound sources are all 5.1 channels, there is no need to go virtual multichannel.
Home theater amplifier essential features
1. Dolby Atmos
Movies using Dolby's panoramic sound technology can bring a full range of sound experience to the audience by adding channels from the top of the head. After two years of accumulation and operation, there are currently more than 120 Dolby panoramic sound films and more than 650 panoramic sound projection halls worldwide. Do you want to enjoy sounds made with panoramic sound technology at home and want to experience what it feels like to be “the thunderbolt†and to experience an immersive “surrounding� Then a cinema amp with Dolby Surround sound decoding essential. 
2, WiFi wireless network
The trend of development in recent years is that while enhancing the decoding function, the amplifier focuses more on the operability of the amplifier and the excavation of the music playback function. This depends to a large extent on the addition of the network function to the amplifier. Internet radio, DLNA, Air-Play, online streaming audio service, mobile music player, NAS HD audio playback, mobile phone/tablet remote control functions, all rely on network implementation.
3, HDCP 2.2
This is another feature that is closely related to the playback of high-definition video. With it, you can watch videos that have copyright protection. Although HDCP 2.2 is not a large number of playback devices, it is precisely one of the most deadly and attractive ones - the 4K source.
As we all know, the 4K film ecosystem is currently the most lacking source of native 4K sources. It is impossible for anyone to stare at several 4K demos repeatedly. Sony, itself a slicer-content provider, has partnered with China Hua Digital Media to launch a player for native 4K content. This player just needs to support HDCP 2.2 devices to connect with it if you want to watch it freely. 4K video, then HDCP 2.2 is particularly important.
4, HDMI 2.0
The major advancement of HDMI 2.0 compared to the 1.4 version is simple: The bandwidth is doubled, which increases the maximum refresh rate from 4K/30Hz to 4K/60Hz. what? Do you think such a high refresh rate is useless? Then you're Out.
If 4K/30Hz is enough to watch 4K movies, 4K/60Hz refresh rate must be used for 4K TV dramas. With the popularity of 4K video recording devices and the maturity of the hardware environment, the popularity of 4K TV dramas in the country is just around the corner. When you prepare a HDMI 2.0 amplifier, don't blame me.
5, Bluetooth connection
The Bluetooth audio function is an important feature for power amplifiers. Get rid of the shackles of the cable, sit comfortably in the sofa and play whatever you like, and use the home theater system to fully express the details of the music. Who doesn't want this easy-to-use, user-friendly feature?
6, Hi-Res HD audio playback
If your amp now does not support Hi-Res format audio, then you can't play with other small partners. Its data volume is up to six times that of CD, and the highest data accuracy of 192kHz/24-bit can be FLAC, WAV, DSD and other file formats, far exceeding the high frequency band of 20kHz infinite extension. Without it, how do you play high quality audio formats.
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Sofa butler industry home theater amplifier is what? It is the control center of the home theater system. Not only can control the playback volume, but also can amplify the sound signal to drive speakers, decode 5.1, 7.1, 9.1 and other surround effects, so that each speaker has its own responsibility, a clear division of labor, improve the overall effect of the home theater system. But do you know about home theater amplifiers? Today we talk about it.