car audio modification concept
car audio modification-the original car audio system is modified and upgraded to improve the sound stage environment and sound quality in the car to meet the "fever" demand of car owners for music.
space
Please click to enter the picture description
Instructions for car stereos
According to statistics, the cost of modifying the primary car stereos ranges from 1, to 7, yuan, and some car owners will put the price first when choosing car stereos. Most car owners admit that they are not "enthusiasts" in terms of audio, and they prefer to spend a little money to improve the sound stage environment and sound quality in their cars, so they often "choose what is cheap" when choosing car audio or refitting shops. However, "a penny for a penny" is not unreasonable.
under normal circumstances, the price of goods will be directly proportional to the functions and characteristics of goods. car owners must consider reasonable prices while clarifying their own needs, so as to buy high-quality and low-priced car audio products. It is worth mentioning that in order to ensure driving safety and minimize the interference of in-vehicle equipment, everyone will have higher requirements for in-vehicle equipment, so a car stereo with good performance will be more expensive than a home stereo. World-famous car audio brands are: Dynaudio? , Harman/Kardon, Burmester, BOSE, Bowers &; Wilkins（B & W）、Bang & Olufsen（B & O) etc.
space
Please click on the input picture to describe
Why do you want to modify the car stereo
As we all know, urban traffic congestion will keep drivers in a state of mental tension, fatigue and drowsiness will increase the danger of driving, and pleasant music can effectively relax the tense nerves. With the increasingly fierce competition in the automobile market, manufacturers have increased R&D costs in terms of appearance and dynamic performance. Under the pressure of cost control, the original car's audio system bears the brunt: in the production and development process, the original car's audio system does not pay attention to unprofessionalism and pursues low cost, resulting in poor sound effects. A good horse is equipped with a saddle, and beautiful music needs a high-quality sound system and speakers to carry it. It is very necessary to modify the original car sound system.
car audio modification steps
1. Know your favorite music style
Some car owners think that good quality audio must be suitable for all styles of music, but it is not. Music is special, and car audio manufacturers will produce different types of speakers according to different music styles. For example, the R6.2 speaker of DLS in Sweden has excellent sound quality reproduction ability, and the vocal interpretation is very pure, while the RM6.2 speaker of the same brand is more suitable for the interpretation of big dynamic music, because it has strong bass performance and sufficient penetration. So you must know exactly what kind of music you like, which is very important for car stereo modification!
space
Please click to enter a picture description
2. Everything should proceed from reality and seek truth from facts
As the saying goes, "You should wear shoes as big as your feet", and the same is true for car stereo modification. 2, yuan can be converted into a car stereo, and 5, yuan can also be converted into a car stereo. The car mainly modifies and upgrades the car according to its own actual situation, and does what it can. Don't put too much pressure on yourself for the so-called vanity, which is not worth the candle.
3. Choose a formal professional car audio refit shop
In fact, most car audio refits in China are carried out in car beauty shops or car accessories sales shops, where technicians have little experience in refitting. They often over-promote the relevant equipment and products to the car owners, so that the car owners who had little knowledge of car audio modification thought that this was "all". In fact, the process of audio modification includes many steps. Car owners can judge whether the car audio modification shop they are looking for is professional or not from the following aspects:
1. Does the modification technician really want to know your needs
2. Does the modification technician know the characteristics of the sound
3. Is the sound insulation construction rigorous? Will there be abnormal noise after construction? 4. Is the selection of wires and insurance reasonable? 5. Is it nondestructive installation
6. Is it professional audio debugging
7. Does it affect the car warranty after modification
Even if the same car audio product is installed by different technicians, it may have different effects. It can be seen how important it is to choose a formal and professional car audio refit shop! Xiao Bian's suggestion is that car owners should find ways to check the evaluation of different customers in advance before choosing a modified shop, or go to the shop to see the construction process of the merchant in person, so as to be aware of it and save unnecessary trouble.
space
Please click on the input picture to describe
Noise generated by vehicles
Sound is generated by vibration, and vehicles will generate a lot of vibration during driving. The engine will vibrate, the exhaust pipe will vibrate, the friction between the car body and the air will vibrate, and even the vibration caused by the friction between the tire and the ground will be transmitted to the car through suspension, all of which will form noise. Terrible is that if the natural frequencies of some parts on the car body coincide with the frequencies emitted by these vibration sources, it will produce * * * vibration (* * * vibration is one of the important reasons for premature aging of vehicles), and after * * * vibration, it will produce more noise.
space
Please click on the input picture to describe
The concept and principle of car sound insulation
Car sound insulation products were collectively developed by a group of American car audio enthusiasts in the late 198s, in order to enjoy the fun brought by car audio better and more carefully. These automobile sound insulation products can not only help the vehicle reduce the noise generated during driving, but also improve the sound pressure and timbre of the car stereo, which can be said to kill two birds with one stone. However, there are advantages and disadvantages. Retrofitting the vehicle with sound insulation will increase its fuel consumption and weight, and the drainage function of the window will also be affected to some extent, which will make the door panel more prone to rust.
In general, as long as the vibration is reduced or the sound is absorbed, the purpose of sound insulation and noise reduction can be achieved. At present, there are four popular treatment methods.
firstly, the damping coefficient of the car body is increased by the shock absorber, and the noise is reduced in the sound source.
second, use sound-absorbing cotton to absorb noise.
refit technicians usually combine these two methods, that is, first stick a layer of shock-proof plate on the car body, and then stick a layer of sound-absorbing cotton on the shock-proof plate (the effect of sound-absorbing cotton is more obvious where there is a cavity). The refitting technician may also lay a kind of mixed material called "Low Frequency King" directly on the automobile chassis to reduce the low frequency noise.
space
Please click to enter a picture description
Third, modify the double-decker sound insulation glass to directly isolate the noise outside the car.
The laminated glass with double-layer composite structure is usually used in automobile sound insulation glass, and the sound insulation and damping glue (film) in the middle of the laminated glass plays a role in weakening sound transmission, which can directly and effectively isolate the noise outside the vehicle. Well-known luxury models such as Buick LaCrosse and Cadillac ATS-L all adopt double-layer sound insulation glass design. Worst of all, most cars in sound insulation glass are dedicated to private cars, so it is difficult to buy them in the market.
fourthly, replace comfortable and quiet tires to reduce tire noise.
Usually, the cost, grip, fuel consumption and durability are considered comprehensively, and comfort and quietness may not be taken into account, especially for some sports tires and explosion-proof tires, the tire noise is comparable to that of rock concerts. It is the most effective way to reduce the noise by directly replacing a set of quiet and comfortable tires. The principle of silent tires of different brands is basically the same, that is, using special design of tire patterns, structures and materials to reduce the tire noise. The excellent silent tires on the market are: Goodyear Royal II, German brand MC5/CC6, Pirelli new P7, Michelin Haoyue 3ST and so on. Silent tires usually have a soft tread. Compared with sports tires, they have weaker grip, shorter service life and slightly higher fuel consumption.
space
Please click to enter a picture to describe
Car sound insulation steps
The car sound insulation treatment of the system generally includes three steps: shock absorption, noise reduction and sealing, and it is impossible to achieve better sound insulation effect only by making fire walls.
most of the noise is transmitted into the car through the suspension system, trunk, chassis and doors, so the first step is to reduce the vibration of the four doors and trunk, and then complete the vibration reduction of the floor, engine compartment and roof in turn. Second, the whole vehicle is treated with sound absorption and noise reduction. The third step is to seal the interior of the car body. It should be noted that the interior of the car body should not be over-sealed. The car body sealing project is the basic project to reduce the noise spread from the outside to the inside. Excessive sealing will cause oxygen deficiency in the car and do harm to the owner's health. Therefore, the refitting technician should keep the car body well sealed and keep the air pressure in the car balanced.
General sound insulation works can reduce the noise by 2-3 decibels, and the noise inside the car can be reduced by 5-8 decibels by selecting good sound insulation materials, and even by 13 decibels in the best case. If the construction workers tell you that they can reduce the noise by 2 decibels after completing the sound insulation treatment, then you have to think about whether you have been fooled.
space
Please click on the input picture to describe
Selection of sound insulation materials
The shock absorber is divided into two parts, namely aluminum foil and adhesive layer. The genuine rubber layer will be made of environmentally friendly materials, and the defective products will be replaced by asphalt. The material of genuine rubber layer is mostly butyl rubber, and the temperature has little effect on its state, and it will remain like plasticine during the warranty period. In contrast to asphalt, temperature has a great influence on its state. There seems to be no problem at low temperature, but at high temperature, asphalt will melt directly and emit various toxic gases, which is definitely not suitable for use in cars. Because the price of asphalt is low, and the shape at normal room temperature is very close to rubber, some unscrupulous manufacturers will make inferior rubber layers to be inferior and confuse customers.
is there any way to tell whether the material is true or false? Xiaobian will teach you now!
method 1: tear off a small lump of glue layer and knead it in your hand. If it is asphalt, your hands will leave stains that are difficult to remove. If it is butyl rubber, your hands will still be clean.
method 2: tear off a small lump of plastic layer and burn it with fire. The state of asphalt is very unstable, and it will melt immediately when it encounters high temperature, so the inferior rubber layer will help to burn and gradually turn into liquid when it encounters fire. If it is butyl rubber, it needs a period of fire to burn itself and does not support combustion.
Misunderstanding of car audio modification
Misunderstanding 1: Data is paramount, and the greater the wattage of speakers, the better
Xiaobian found that many car owners' concept of car audio modification is that the greater the wattage of speakers, the better. Actually, there is no best, only the best. Why do you say that? On the one hand, 95% of the original cars have no independent power amplifier, that is to say, the horn unit on the car is driven by the integrated power amplifier with less power in the main engine. The host of the original car is divided into two types: CD and DVD (some are equipped with MP5, so let's classify them as DVD). The peak power of CD is generally within 3W, and that of DVD is generally within 5W. If rated, both are generally around 2W. In general, the refitter will suggest that the power of the selected amplifier is slightly higher than that of the horn, and the power of the refitted horn basically starts from 4W (the rated power of the horn is defined as the power that the horn can bear continuously. Note that it is sustained, not sustained).
In today's market, the genuine fish is the genuine pearl. Many well-known brands boast that the rated power of their speakers reaches 9W (as shown below). Don't believe it. Therefore, it is basically impossible to configure the horn according to the thinking that the greater the wattage of the horn, the better. On the other hand, a high-power speaker needs special equipment (DSP) to drive it, otherwise it will not play its due level at all. In addition, Xiaobian has to remind car owners that the power marked by many products is actually fake. Merchants all know that "the greater the power, the higher the price". Using the psychology of "data first" of car owners, marking the power higher than the actual power can make them earn more profits.
space
Please click to enter the picture description
In addition, the speaker has a very important but often overlooked parameter-sensitivity (a speaker with a sensitivity of 9db can be regarded as a high-quality speaker). This is the most important data for junior car audio players, because the sensitivity can tell you whether the speaker is easy to drive.
Myth 2: Modification is a very simple matter
In the eyes of most people who don't know about car stereo modification, changing speakers is as simple as changing the chassis. As soon as the screw of the original horn is loosened, the new horn is installed upwards. Done! But this is not the case. Basically, all the original car horns are integrated with the original car horn gasket, and they are also closely attached to the sound guide cover on the door trim, so it is impossible to remove them casually. Here, Xiaobian will explain the correct speaker installation steps for you.
1. Observe whether the treble is on the door panel. If not, consider where the frequency divider is most suitable.
2. Carefully remove the door panel, and then remove the original car horn.
3. Measure the gasket height and diameter of the original horn, and calculate how many gaskets are needed for the new horn. If the gasket can't adjust the new horn to the ideal height, it is necessary to re-make a new sound guide cover that matches the original door trim.
4. Waterproof the gasket, and the horn needs to be equipped with a waterproof cover.
5. Determine the installation position of the frequency divider to ensure that it can avoid interference. (There is an inductive coil in the frequency divider, which is easy to pick up the surrounding electromagnetic signals and cause interference)
6. Carefully wire and connect.
7. After installation, test whether the modified audio has * * * vibration phenomenon with large dynamic music and test whether the phases are consistent with each other with a phase meter.
Car stereos are different from home stereos. Without formal and professional technical support, even the best host, speakers and amplifiers can't exert their real strength.
Myth 3: The more expensive the audio equipment, the better
Although Xiaobian has repeatedly emphasized that "you get what you pay for", the more expensive the audio equipment, the better. Car owners should choose equipment according to their actual situation and their own needs, and do what they can. Don't blindly choose the high-priced ones because of vanity, and don't blindly choose the low-priced ones because of greed. In fact, for the primary car audio refitters, even if some well-known brands of audio equipment are selected, the overall modification cost does not need to exceed 1, yuan.
In addition, under normal circumstances, the construction cost of installing the audio will be around 3-5 yuan. If the overall price of the car audio set (package installation) you choose is too low, you should consider whether the merchant has cut corners in the manufacture of the product to deceive customers. For example, if you buy a car audio set with six speakers and two frequency divisions (including installation), but its retail price is lower than that of 9 yuan, then your risk of stepping on thunder will be very high.
Myth 4: Blind pursuit of "foreign brands"
Many car owners have a "foreign brand complex" and think that foreign brands must be better than domestic ones, but they are not. Many excellent audio products are made by domestic brands, and most of the "foreign brands",