[Home Theater Network HDAV.com.cn] Home theater amplifier can be regarded as the most basic equipment in the home theater audio system, its main role is to amplify the weak electrical signal to drive its speaker to make a sound. The importance of home theater amplifiers can be imagined, but as people's demands for sound quality are getting higher and higher, more and more people join the ranks of enthusiasts!
Compared with speakers, home theater amplifiers are often a blind spot for people to buy home theater audio systems, mainly because people don't know much about the brand and effect of home theater amplifiers, which leads to many inferior quality products being shoddy in the market. Today we will share with you several common methods of inferior power amplifiers and their identification methods.
First, the common means of inferior power amplifier: the protection function is not perfect
The protection function mentioned here is not perfect. It is not that the inferior power amplifier does not have the function of starting the anti-shock protection. For this point, the profiteer wants to join the function without much effort, but rather the inferior The amplifier ignores the necessary overcurrent, overvoltage, and output DC protection. Simply put, the poor quality amplifier is too poorly reliable and will burn your speakers.
How to distinguish:
The easiest way is to short-circuit the short-circuit output. If the amplifier you want to start does not have protection action, it may cause damage to your speaker. If there is no physical object, you can use the circuit diagram to determine whether there is protection function, but if you want to do this, you still need to find a knowledgeable talent.
Second, the common means of inferior power amplifier: ignore important circuit design
This point is also a proof that the profiteers have grasped the consumer psychology very well, that is, using a tall design to attract consumers, and then there is basically no special design inside, which can be understood as a high appearance. , but to cover up the shortcomings of its internal circuit design. It is also common to use Class B fillings. This must be noted.
How to distinguish:
If you are not familiar with home theater amplifier products, the easiest way is to buy some big factory products, reliable and reliable, one penny. Or find a knowledgeable enthusiast, let him choose to buy with you, don't forget to eat afterwards!
Third, the common means of inferior power amplifier: really not sinking better
When many people buy home theater amplifiers, they will feel more and more good. In fact, a good power amplifier basically uses a fever-grade double-ring cow transformer, and the weight is not light. Inferior power amplifiers have also seen this, and also use double-ring cattle, but the silicon steel sheet and the winding process make people dare to compliment. After all, it is not a big factory product, it is difficult to pass the process, and its overall efficiency and power are not up to To the request.
How to distinguish:
In fact, this is very easy. It is a relatively quiet environment such as at home or in a shop. Listening carefully to the ring cow is not awkward. If there is, you should pay attention to it. Is it yours? Ring transformers are inferior products.
Fourth, the common means of inferior power amplifier: the capacitor is not bigger, the better
This kind of method is hard to find if you don't open the box of the amplifier. Many unscrupulous profiteers like to use large domestic capacitors to pretend to be small and bulky imported capacitors, and the capacitors will also choose some eliminated capacitors. , shoddy, with a large volume gives a feeling of calm, in fact, the pressure and capacity are not up to standard.
How to distinguish:
Resolving the capacitance is actually very simple, because many of the fake capacitors will be lighter than the high-capacity capacitors of the same volume, and you will understand the weight of your hand!
Five, commonly used means of inferior power amplifier: no dedicated decoding circuit
Although it is a poor quality amplifier, but in order to hide people's eyes and ears, many profiteers still design their inferior power amplifier products into 5-channel and 7-channel output, but this is mainly caused by the left and right channel series resistance, many inferior power amplifiers are not designed independently. The amplifier circuit has no dedicated decoding circuit and sound field processing circuit. Although labeled with Dolby Orientation, there are no noise tests and so on.
How to distinguish:
The easiest way to distinguish this is to see if the surround and center can adjust the volume separately. If you have a home theater amplifier with SRS technology, you can easily distinguish between true and false by opening different surround modes. If you have a M69032 Dolby decoder chip, but you don't have a Dolby label, it may be a counterfeit product. So be sure to pay attention.
In fact, when buying a home theater amplifier, just remember to use enough and easy to use, do not excessively pursue the design of the overall appearance of the amplifier. After that, the matching of the home theater amplifier and the speaker must be reasonable. Bring your own audition disc or choose the music you are familiar with in the store when you audition. Only the things that really suit your ears are good things. This is absolutely true. . More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.
Note: This article is transferred from Solan. The article is an independent view of the author and does not represent the position of the home theater network.
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