How can we judge the good and bad of its advantages and disadvantages for audio amplifiers? Today, the Jazz Dragon Spelling Engineer gives you some suggestions to let everyone do not have headaches and troubles when facing such problems.

First, many people think that the amplifier is "better and better". Most of the inferior amplifiers use ring -shaped transformers, and many of them use a fever double -ring cattle. However, the quality of silicon steel sheets of this type of ring cattle is very poor, and the winding process is not closed. It causes low efficiency and small actual power, especially when quiet, it is easy to hear the ring cattle "humming".

Second, it is a large -capacity domestic capacitor with a large -capacity domestic capacitance. Some manufacturers even use the early staged capacitor update to be updated and packaged from the new capacitor. The actual pressure and capacity of these capacitors did not reach the standard value at all. Such capacitors are generally lighter.

Third, to resist medium and high -end amplifiers such as 4558 or 082 charging 5532. Sometimes it is found that many so -called 5532 actually came from 4558. There is also the most fakes that are used in the inlet tube, especially Toshiba.

Fourth, inferior amplifier often has 5 -channel or even 7 -channel output. However, in fact, the surrounding and middle -setting channels of many amplifiers are connected by the main sound of the left and right pronunciation. Although some amplifiers have independent amplification circuits, they are only simple delayed. There is no dedicated decoding circuit at all. Harmony field processing circuit. If you find that the surrounding and middle -setting channels cannot be adjusted alone when you find that this type of amplifier is found, it must be a fake surround that comes from the main channel.

If the nominal Dolby's directional logic decoding function is not available without noise testing, or when the speaker is surrounded by only a single -channel signal, the amplifier belongs to the pseudo -ring winding power amplifier. For power amplifiers such as SRS and Q-Sound, it can also be identified by comparing the interviewing and turning around the surrounding function and selecting different surround modes. Here we need to remind everyone that although some audio manufacturers really use Dolby decoding chips such as M69032, they have not passed the Dolby certification and pasted the Dolby logo. Such power amplifiers cannot ensure that the necessary channels such as channel separation are also ranked by counterfeit.

Fifth, there is a lack of complete protection functions. Although inferior machines have the function of preventing impact and protection, most of them have omitted the necessary overcurrent, overvoltage, and output DC protection functions, resulting in poor reliability of the whole machine. The expensive speaker unit. For the identification of this kind of fake method, first, check the circuit diagram to determine whether there is a perfect protection function; the second is the short -term short -circuit output terminal, if the amplifier does not have a protection action. It is likely to save these protective circuits, at least it is also poorly adjusted.

6. It is based on category B and one -sided pursuit of multi -function and appearance to ignore the level of circuit design, and use this as a selling point. This belongs to the "advanced" fake method. For these "distinctive" amplifiers, if consumers are not familiar with audio equipment, it is best to ask people who know how to choose, and try to choose the products of the audio manufacturer.