First, a preliminary understanding of the speaker before the audition. A preliminary understanding of a pair of speakers can be identified through the steps of "observing, weighing, tapping and identifying": observing the process, weighing, tapping the box and identifying the nameplate. The concept of technology is to judge the quality from the first appearance of the speaker: the speaker made of natural logs is of course the best, including many world-famous high-priced supreme speakers such as chario and guarneri in Italy. Because of environmental protection, lack of resources, difficult processing technology and long time, it will never be as popular as the ubiquitous "Rejoice" shampoo. Therefore, the common speakers are decorated with a thin layer of wood veneer on the surface of mdf medium density fiberboard: solid wood veneer, beautifully decorated speakers, especially rare wood veneers such as rosewood, sparrow eye, pear wood, walnut, Zhennan and red oak, which have excellent natural wood grain visual effect and smooth and comfortable feel. Especially those pianos polished with symmetrical butterfly pattern solid wood skin after multi-layer coating can be regarded as high-end boutique speakers, and there are very few counterfeit products. Boxes covered with pvc (Shabili) plastic belong to daily necessities. Although the workmanship is fine, it can only be regarded as low-grade goods at best. However, although the box decorated with this kind of paper veneer looks extreme, it is more important to pay attention to whether the sewing behind the box and the digging process of the horn installation position are accurate. Fake and shoddy products generally don't pay attention to these details, and they can be judged correctly with a little care. Second, weighing: Good speakers mostly use 18 ~ 25mm high-quality mdf particle board, while high-end flagship speakers use overweight solid wood such as rosewood and yellow pomelo or multi-layer composite plywood, which is amazing in weight. Usually, the net weight of a pair of speakers reaches 50 or 60 kilograms. Most middle and low-grade customers eat soft particleboard, while fake and inferior products use inferior paper rubber board, so the weight is generally light. There is often a saying in the audio industry that "experts look at quality, laymen weigh it", and heavy speakers are definitely better than light speakers. However, it is necessary to be wary of unscrupulous merchants pouring sand and cement at the bottom of the sound body to gain weight and deceive consumers. The third is to knock on the box: knock on the front, back, left and right baffles of the box with your knuckles, and all sides of the box will be heavy and slightly brittle. It feels that the plate is hard and thick, supported by many reinforcing ribs inside, the box structure is reasonable and firm, and various sound insulation and standing wave prevention measures are adopted. This kind of box has high processing cost and great difficulty, and there are few fake and shoddy products. If you hit the box with your knuckles, it will make a "poof, poof" empty sound, indicating that the plate is too thin, the material is too poor and the structure is unreasonable. And there is no sound absorption material or reinforcement inside, which leads to a large number of diffuse reflection and standing waves in the box. You will never get a good playback effect if you buy this kind of speaker. The fourth is to identify the nameplate: the really good speakers have well-made gold-plated or chrome-plated nameplate signs, and the nameplate is generally engraved with distinctive trademarks, companies, names, places of origin and corresponding indicators. Imported boxes are in English, such as xxx manufacturing or manufacturing, corresponding trademarks, speaker indicator lights, etc. If only the design ... (XX design) or only a country name is vaguely marked, even apart from a few simple and extremely imprecise basic indicators, neither the place of origin nor the manufacturer can be seen, and the trademark has no registration mark. Most of these three products are suspected of counterfeiting. Brand-name speakers attach great importance to brand image and corporate visibility, so the attached nameplate logo is very standardized and exquisite, with all indicators, corporate names and places of origin available. Some nameplates are even thin metal plated with 24k real gold, and the fonts on them are still uneven. The product not only has the date of manufacture and production serial number, but also has the matching serial number and the ID card attached to the packaging box. For this kind of speakers, as long as the price is reasonable, you can generally choose with confidence. 5. Judging the quality of the speaker from the technical indicators mentioned above, a technical label is usually attached to the back of the finished speaker: the content is nothing more than the frequency range, sensitivity, carrying power and impedance of the speaker. Sensitivity is the most important indicator of the speaker, which largely determines what kind of power amplifier the box should be equipped with, how much power it needs to push, and so on. The sensitivity of most audio-visual home speakers is between 86 and 92 decibels. For the same power amplifier, at the same volume (for example, the volume is adjusted to 10), the higher the sensitivity, the louder the sound, and the lower the power requirements and requirements of the speaker for the power amplifier. This is what people often say: speakers are easier to push. The sensitivity of professional speakers used in many commercial ok halls exceeds 100db, so it's no wonder that many people think that singing karaoke in ok halls is very pleasant, and you can get a great volume with no effort. But don't think that the higher the sensitivity, the better. In fact, speakers with sensitivity over 92db are all thin metal pots and pp pots, which will destroy the control of speakers, resulting in thin, beautiful, exaggerated and tough sound quality, and lack of many musical details and charm. Not suitable for high-fidelity listening. However, many famous mouths with rich and soft voices and full of music are usually less sensitive. For example, the sensitivity of top speakers such as Emperor atc, Italian piano and Li Zhuo is only 82db. This kind of speaker is often extremely difficult to serve, and it needs a giant power amplifier with a large output current to make it work in the ideal linear region, and the cost will never be small. Another most important indicator is the frequency range. For example, the frequency range of the domestic boutique Xindeke Compass 1 bookcase is 60hz ~ 20 kHz 2.5 dB, and 60hz represents the extension value of the speaker in the low frequency direction. The lower this number is, the better the low-frequency response of the speaker is: 20khz represents the high-frequency spread that the speaker can achieve. The higher the number, the better the audio characteristics. The suffix +/- 2.5db indicates the distortion of the above frequency range, and the smaller the distortion, the flatter the frequency response curve will be. The distortion of some speaker labels is 3db, and its frequency range should be wider. Some speakers do not indicate this indicator, and the frequency expansion range will become very wide. For example, if the above compass box 1 does not indicate that the distortion is controlled within the range of plus or minus 2.5 dB, the frequency range can be marked as 40 Hz ~ 23 kHz. It should be pointed out that it is meaningless not to mark the frequency range of distortion. If manufacturers knowingly commit crimes, they can only suspect that they have ulterior motives and deliberately deceive consumers. At the same time, it also shows that the speaker indicators are not standardized, manufacturers lack confidence in their products, and it is difficult for people to buy with confidence. Bearing power is a reference index of speakers, expressed in watts. This index does not explain the quality of the speaker, but only provides a reference for selecting the power amplifier. For example, the bearing power of a pair of speakers is marked as 10 ~ 200w, which means that the power amplifier needed to drive the speakers must have at least 10~200w output power, but it is forbidden to use the power amplifier above 200w for full power output. Otherwise, there may be concerns about burning boxes. Generally speaking, home speakers will never be pushed, only the problem of pushing well and pushing badly. The carrying power below 200 watts is much more than that of ordinary families, and it is not deliberately pursued too high. Another indicator of the loudspeaker is the impedance value, which is generally 8 Ω as its nominal value. The impedance value of most dual-frequency bookcases is 8 Ω, and multi-unit multi-frequency floor speakers also have 6 Ω and 4 Ω. The smaller the impedance value, the greater the current to be driven and the higher the power amplifier required. In my opinion, it is best to choose 8 Ω power amplifier with good impedance for home speakers. 6. A good speaker should have an obvious personality. In modern audio equipment, the speaker is the oldest and most magical member. Some people say that it has "spirituality" and "life", and it is the precipitation of a country's national style, history and culture. Indeed, as far as brand speakers are concerned, speakers made in different countries and nationalities are branded with the cultural literacy, natural endowment and personality traits of the nationals of the producing countries. Especially for speakers with higher quality and higher grade, this personality will be more obvious. Secondly, for users, the same excellent speakers with different personalities still have a taste, and they like a certain style. As the saying goes, "turnips and cabbages have their own tastes", some people like graceful and passionate demeanor, some like gentle and gentle hermit personality, some like grand symphony, heavy metal percussion and rock music, and some prefer small-scale pastoral classical music, elegant and graceful solo and sweet and heavy vocal reproduction ... Of course, you can choose the ideal speaker according to your own taste. If you don't understand the truth, you will be disappointed to choose the right speaker with your own taste! After all, this investment is not cheap. So I suggest that you might as well know more, listen more, run more authentic audio products, listen to the opinions of friends and experts before buying. Meanwhile, what style do you like? I might as well ask myself a few more times, what did I buy this speaker for? Listen to music? Watch DVD? Sing ok? Or ... as far as the style of the speaker itself is concerned, the so-called American sound, British sound, European sound and so on. Very popular in the audio industry. American speakers pay attention to strong strength and great power, especially those produced in the western United States, such as jbl, bose, genesis and so on. It often shows a free and easy, rough and generous timbre personality. This may be related to the heroic temperament of cowboys galloping in the grasslands of North America in the western United States. The United States has a vast territory, steep mountains on the west coast, lush forests, beautiful blue sky and rich products. Coupled with the wild and unruly character of the cowboy in the west and the infiltration of Hollywood culture and art, the speakers produced in the west have bright and beautiful timbre, clean and neat sound, wide opening and closing, and a kind of confidence and confidence are revealed in the rough and unrestrained. The surplus of each index is very large, especially suitable for rock, jazz and heavy metal percussion, professional ok hall and other occasions. However, in violin solos and classical strings, the music is a little light. The speakers produced in the eastern United States are more influenced by British and European civilizations because of geographical factors. In addition, the famous Philadelphia Symphony Orchestra advocates classical symphonies and influences regional culture with a large number of performances every year. Therefore, speakers produced in the eastern and western regions, such as infinity and westlake audio, have a soft, delicate, broad and bright style. No matter from the analytical power, sense of speed, sound stage positioning and fragrance, it is obviously different from western speakers, and it is very popular in Europe and the Far East. 7. A good speaker should be very tolerant of listening. I don't know if you have ever experienced it. When you turn on the stereo and enjoy music with great interest, the sound is good at first, and the sound is strong enough, especially the middle and high frequencies are bright and moving, and the low frequencies are also satisfactory. But after listening for a while, I felt uncomfortable. I was so tired that I had to turn off my cell phone and go. This kind of "tired" speaker can't keep the guests, because it makes people feel "noisy" and annoying. A "noisy" speaker means that the box is distorted and uncomfortable to listen to. Certainly not a good speaker. Listening to a good speaker with good quality is like tasting a 30-year-old flower carving daughter line buried deep underground. The owner feels sweet and refreshing, and the beer is long. That kind of "sweet" and "warm" music charm will make you forget time, space and even your own existence and indulge in the ocean of music. No matter how long you listen to it, you will never get bored. A good speaker has extremely low distortion. So no matter the volume, it will make you sound very pleasant. Even if the volume is turned up to the maximum power, the speaker will burst into earth-shattering sound. The low frequency will roll like thunder in midsummer, which will only make you feel realistic and even horrible, but it will never let you escape. Generally speaking, speakers with thin voice, hard timbre and fast speech are not very pleasant to listen to. We can be sure that it is caused by the thin speaker, poor sound absorption, simplified frequency divider and low grade speaker. Nature is not a good speaker. A good speaker is very resistant to listening, it can not only retain guests, but also the longer you listen, the more cooked you cook, the better your timbre will be. No wonder so many audio lovers enjoy it and have a high fever!