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Stones from other hills may serve to polish jade passenger vehicle networking systems of reference
Mainstream domestic passenger car business networking technology spread, intelligent operating system released in stages, for
networking in China s car industry go? Europe and developed countries, technology has matured, stone hills, or jade?
Europe and other countries, car networking technology overview:
U.S. and European car companies earlier application vehicle networking technology management team, such as Man, Volvo, Scania,
Mercedes and other companies, while passenger transport companies in Europe and America also actively use the relevant technology.
In addition to Europe, Japan and Taiwan in the vehicle management system development is also done a lot of attempts to obtain
good results.
Scania Fleet Management System Description:
Sweden s Scania s fleet management system introduced by GSM / GPRS, driver information and vehicle to achieve the wireless
transmission of data, can provide road passenger transport management, driver management, vehicle management. Management of
road transport include easy to understand and record the fuel consumption display, the vehicle condition display, to help drivers and
transport companies to quickly understand the content needs to be improved. This feature can monitor vehicle location, maintain the
fleet location and status tracking. Upon receipt of a new task, the system can view the status of the vehicle can be used, as well as
the progress of the task being performed, you can drive to maximize the efficient use of personnel and vehicles will help master the
exception occurred. When the v
subwoofer car audio installation purposes
There are car people for car audio sound quality very seriously, especially in the music s overall performance higher, after installing the
sound does not always feel nice little something, this is the lack of subwoofer. The purpose of installing the subwoofer:
Many people install subwoofer is blind, that felt great sound is good, and some people think that installing the subwoofer in order to
listen to “disco, rock and roll” and set up, do not listen to other music subwoofer, which are is wrong. So why is it to install
subwoofer? What is the purpose?
1, motor cars and friction in the tire and road noise, engine noise, wind and vehicle conditions often make the internal structure of
bass has been weakened, especially in fast speed, due to the impact of noise, heard very little bass. Install the appropriate high-
performance subwoofer to enhance the bass region, can be an ideal solution to this problem.
2, the general focus only on the host and install the audio treble, bass up to, for example: 6 × 9 inches, although the speaker of the
indicators give a wide frequency response indicator, but when the decay reaches the subwoofer area badly, so the performance of
this band is not prominent. Only dedicated subwoofer to compensate for this band, the bass extension, in order to make a complete
music player. Thereby maintaining the natural tonal balance, it sounds rich depth, breadth, fullness, and clear and pure.
engine four major parts can not be converted audio lighting etc can be
changed
Hot streets of Hangzhou recently killed people drag racing event, once again raises the concern of car modification. What are the legal
limits modified in the end? How to show off both modified and will not go wrong? Insiders pointed out that the performance of the
vehicle reborn transformation, should think twice. Any one of the car before going into production, vehicle performance and with the
various components are calculated through sophisticated, major modifications to the vehicle, may lead to security risks. Higher car
modification technology, general vehicle maintenance workers may not be able to manage.
Have modified the car essentials, first in security must be guaranteed under the premise of modification. Without changing the car s
dynamic performance, if not taken into account with matching brake, balance and other issues, will lead to significant security risks,
and even lead to accidents. To increase the roof, for example, modification changed the manufacturer verified through sophisticated
aerodynamic design elements, but also change the body s strength, impact traffic safety.
Four major parts of the engine can not be changed
The new “Road Traffic Safety Law” clearly provides that any unit or individual shall not be assembled motor vehicle or motor vehicle
registered without changing the structure, construction or features. The vehicle structure, including exterior color, length, width,
height and four rigid standards and engine-related technical parameters. Therefore, the legality of their vehicles, the key is to see
whether the vehicle and driving license photo on line, and technical parameters are consistent with the vehicle factory. Does not
comply, it can not pass the annual inspection.
The car has been licensed for modification, the Vehicle Administration should be declared, and its modification by the Vehicle
Administration technical report examined and approved only after the conversion. Conversion is completed, but also adapted to the
Vehicle Administration for the change. It is understood that the car body color, license plate number, engine number, chassis number,
etc. are very important in the motor vehicle registration project, and to take pictures archive sector management of these projects is
the motor Vehicle Administration, investigate traffic violations, traffic incident handling is an important basis and clues.
Sound, lighting and other parts can be modified
In the end what parts of the modification does not influence the vehicle driving pleasure and safety?
Reporters learned that this car is mainly converted more sound, surrounded by large, lights, tires and other parts. Modification is
surrounded by a large number of modified fan favorite, a large steel and glass, surrounded by Material carbon fiber two. Installation is
surrounded by large screws or rivets on, almost no damage to the body, and removable at any time.
Modification of lot lights. Light of the modification, no doubt good for eye-catching at night in the third. Owners can be changed to
xenon headlights lights, brake lights also can be in the post, trunk, tail and other parts of the installation of LED cold light, this
modification can improve the safety of driving at night. In order to enjoy the driving pleasure, like many of those who love drag racing
brake system and suspension modifications. Suspension system by modification of the damping device, the rod and the rod of various
modifications to improve handling stability, increase tire grip, so that the modified car turn more easily, and more sporty.
Safety of the car is basically no effect on the audio conversion. Be modified on the audio, be sure to pay attention to increase the
battery charge capacity, you can replace a battery. In addition, note that replacement of the line, to avoid wire overload due to fire.
with the release of market demand for technology – car audio car-specific development trends
China s auto market after the most to promote the concept of the role of a technology or invention that is “car only.” In essence,
dedicated car a few years ago the host of a general-purpose vehicle market segments, its direct role for all to see, host special car of
the car after the release of the maximum degree of market demand, and this process first-class will continue the momentum of inertia
was developed. From a technical perspective, the car is not a mystical special utility model invention, at best, only from the hardware
and the original car audio systems and establish a non-destructive of the agreement. In fact, popular car special reason, from a deeper
perspective of China s auto market after spending reflects the universal rule: non-destructive of the individual needs to achieve. In
other words, dedicated car built on a broad basis of consumer psychology, reality, the status as a luxury car still has not changed,
especially the midsize sedan, consumers do not want to destroy the original vehicle equipment or style, but effectively There are
audio-visual and other personal needs, this is a special car up to today s consumer psychology prerequisite, which is why the PND why
the first host in Car DVD navigation, and so far the best interpretation of the enduring.
Host dedicated open-car market car
Following the success of the host vehicle to car-specific as a stepping stone to make a million units-level market, automotive supplies,
automotive supplies, especially of immediately picking up special car, special visual reversing car, car-specific floor mats, car dedicated
LED special reading lights … … car car market with Chinese characteristics, a synonym, although car-specific process, there will be
some “cottage” of the case, but in the long run, private car is the domestic needs of the automotive products market segmentation is
able to effectively leveraging consumer market product development direction.
As an integral part of car audio, car-specific pre-and post-class car in full swing sound wants to come in stark contrast. October 2008,
the author in a show with a renowned company CEOs chat after class after class, when the future development trend, when talking
about car into the 4S shop dedicated host channels, the CEOs believe that the host into the 4S shop special car, the biggest
advantage for the 4S shop to solve technical problems, basically no pressure sales, which is car-specific host to the biggest potential
advantages of pre-installed. In fact, when the car stereo does not have to enter into the terminal 4S stores or mass retail channels,
the reason, there are also stark contrast to the profit compared to the host, saying “sake Reds face, gold heart moving Road”, 4S
shop certain retail channels or terminal “phase of ownership and the lesser evil”, select the profit margin is high and the pressure of
small car sales dedicated host.
Begun to taste the sweetness of the special car audio car
In fact, car audio car specialization there is no technical bottlenecks, only need to solve installation problem, that of the original car
horn bit and the original car audio adapter cable to the plug issue. Passage of time since last year, after the fierce class dedicated car
started to heat up, ready for domestic brands, and “focusing instead on a large fortune.” Tasted the sweetness, the foreign brands of
fashion, such as who the BMW 3 Series, 5 Series, 7 Series supporting Germany ETON, its domestic upcoming Volkswagen, Toyota
series car special audio products. I had and made a simple exchange of the manufacturers, they believe, in the U.S. and European
markets, similar to car-specific installation of this non-destructive of the original car has become a consumer concept, the Chinese car
market car audio exclusive has just begun.
Specialization course after class car industry is beneficial, beneficial owners of a good thing, but the car also need to grasp the special
direction of the process, such as built in the channel, is inherent in the traditional use of modified car audio shop, or the reconstruction
of the retail terminal channels? In the mixer, the need for specific models, the positioning of the audio equipment, and personal
listening needs to be treated differently. All in all, exclusive of car audio car is good, but not exclusive of each brand of car can be
accepted by the market, car special is the trend, the broader market segments, manufacturers launch products, but should focus on
plan ahead to meet future market demand.
Another terminal stores the future profit growth
On a deeper level, market development strategy, automotive car audio exclusive of the right time, the reason I say that is because
before, the market acceptance has been verified by a dedicated host for the car. Practice has proved that car-specific host-specific
since the introduction of the concept car, and achieved rapid growth, while domestic car the first car audio exclusive gold who has
tasted success “Hunxing.”
Domestic automotive supplies, particularly in the automotive electronics market, with examples of technology emerging market
demand for the release, As first steps, but a late start in the car industry-specific areas, car audio in the car market may be dedicated
to the final direction of the search , following the success of open end car audio specialty store has been modified, full access to
supplies an opportunity for the retail terminal channels, capital and labor to have a certain strength of the end retail stores, the special
car of car audio products will gradually grow to its mainstay business One of the next year or two, after the class car-specific products
will be converted end car audio shop, following another car after the host-specific long-term profit growth.
car audio conversion price and functionality is the key concern
More and more economic cars into people s home, can be said that the development of automobile industry in recent years led to the development of the whole chain of the automotive industry, and car after car audio has become the most frequent replacement of a project. How to choose an economy car for car audio has become a concern.
car subwoofer box
Now on the market is the absolute number of economy cars, and generally is a private car-based, open-economy cars so the crowd is very concerned about the car, will start from the car on the market a lot of contrast , including appearance, fuel consumption and function. So in the process of car use is the same, in terms of maintenance and modification, etc., want to give your car a more perfect choice to protect and improve methods.
Price and functionality are key
subwoofer box
In the choice of sound, we must first choose a brand of car audio. Some might say that, in fact, no difference between the brand not the brand, the key is the price and features. I personally do not agree with this view. What is brand? Brand includes many elements, but also that the brand represents the strength and commitment. Well-known brands have their own R & D, which represents their continued innovation, even under adverse conditions in the market will not blindly follow the trend, but rather play the role of industry leader, play a catalytic role for the industry, This can guarantee that these firms are not ephemeral, at least as a consumer is guaranteed. Consumers buy the brand product, you will naturally enjoy the brand s sale brought other additional services.
car audio subwoofer
As we all know, the current domestic car audio brands, divided into two systems, one is Japanese is now the first choice among everyone in the concept of product; one is the domestic products. The main representative of Japanese brand Sony, Kenwood, Alpine, Pioneer, and the main representative of brand domestics song rhyme, fly rhyme, Huayang, ultra-sound. This applies mainly economic car audio brand for example, of course, a professional audio conversion to relate to more foreign brands (including European and American countries). For now, there is the most low-end brands of car audio products prices are around $ 600.
Very similar to the current car stereo color TV a few years ago the industry. At that time, also the Japanese mainstream, while the domestics in its infancy, more worthy of our attention is that the current low-end car audio, the vast majority of Japanese products that are produced by the domestic OEM, that in fact the car in this grades sound, the sound quality is not much difference. It should be noted that Alpine can be said that an exception, because the concept of Alpine and other brands are not the same sound, that is focused only on quality, so the Alpine s most low-end products require about 1,000 yuan, of course, it would be of different quality , but can be a simple function can not be easy, only basic FM and CD functions.
From the product point of view, the most basic function is to car audio FM and CD, and then is to add MP3, WMA, shockproof, color screen, with USB interface, audio input interface, and so these features. Overall, each additional feature will be enhanced as part of a cost.
When the self-made brands
Economic choices are brand car audio products is another important reason is that after-sales service. The reason why the price of domestic brands than similar products on the Japanese brands low prices a notch, very important reason is that the service above, the reason why many people do not want to buy domestic products, not because the product causes, but because of the after-sales service no confidence, which is mainly a few years ago a lot of domestic companies in this industry since the drop caused by the brand at that time a lot of brands have mushroomed flooded the market, but few really can stick to long-term, which also led to the purchase of product in the event of a problem and not deal direct damage caused to the user. But as the industry reshuffle, more and more domestic enterprises have to pay attention to this problem, several domestic brands mentioned above be in the current one of the few domestic brands have their own perfect service system, several home. Sound economic car purchase can refer to three steps:
A product according to personal preferences.
Second, while the choice of products to choose well-known brands.
Third, choose the product features.
After all, car audio needs modified in time to change the original car s audio line, so the conversion look even when converted stores is safe and reliable. Sometimes the same model with the brand s products in different price difference a lot of business, the difference in what it? Naturally adapted technology. To give a very simple example, the modified lines need to use heat tape wrapped multi-professional, and the conversion of poor shop may simply wrapped with ordinary adhesive tape, this will easily lead to vehicle running in the heat tape ignited, causing Auto ignition. Here we recommend the best companies to have direct conversion certificate authority store, that would be more at ease.
detail the Audi A6 Audio conversion: not the most expensive but the best
For ordinary consumers, the Audi A6 2.8 of the original car s audio configuration has been very good. However, the owners but
then the sound system was not very satisfied. Although not a pure sense of the enthusiasts, but the dedication of the music, the
owner has their own unique perspective: “The car in the rapid development of modern civilized society, no longer a byword of
transport, but the family and society with a high degree of progress body, while the music can mold character, can express their
emotions and feelings of loneliness can comfort, but also ease the work produced under high-intensity pressure so the car stereo is an
inevitable product of social progress, and I installed sound neither Herd, also not show off, but because I like and need. “
In the audio equipment that are not expensive is good, but for their own is the best. After repeated listen, the owner with a typical
American-style brand blessing audio equipment. Used to good fortune before the sound field distribution in the Mainland s top suit
speaker X162S, after the sound field using speakers to suit fu P162S, generally speaker can only handle 10-30W of power. Fu-band
horn was not to limit, they are designed to be able to hear beyond the scope of our real, can handle more power in the case, to
ensure accurate reproduction of all music.
amplifier used to blessing PUNCH 4004 and PUNCH 6001, respectively, to drive around the sound field and PUNCH P310D4 two 12-
inch bass. Within the amplifier to have a blessing PUNCH called TOPAZ (U.S. Patent No.: 5.751.823) of the patented noise
cancellation circuit, amplifier and audio simultaneously when connected, pre-amplifier before the formation of a “kill zone”, so that the
input to connected with the chassis ground connection between the shield, and can generate 30-40 dB improvement, so PUNCH
amplifiers have higher efficiency, less noise and higher output.
The two sets of the system to increase the bass sound system also give the two octave bass, increasing the bass impact and clarity,
so that the entire system more powerful bass and a strong relaxation. The host is using the Alpine CDA-9855, with upgrade potential
of a high-end host. Alpine can be connected to the digital processor, adjustable 512-color color panel, support Apple s ipod player
connection, compatible with MP3 and WMA format music and CD, mouse button control, comes with a booster, to prepare for car
voltage lack of need, MX function is to help you burn a CD or reading a CD in MP3 format, the loss of some data come back, to ensure
the authenticity of sound quality, no wonder the owner of this host also favor for me.
Because Audi sealing itself to be slightly better than ordinary cars, sheet metal must be thicker, to the car to do noise reduction works
very hard. Audio output line selected silver woven wire, power transmission using the 4th oxygen-free copper wire, insurance is a safe
and reliable use of race-class gold-plated waterproof insurance.
Audi modified only from the appearance do not see, any clues, I discovered that there are tricky to open the boot: two 12-inch
woofer to the blessing stood neatly on both sides, PUNCH 6001 amplifier upright standing in the middle. Insurance, capacitors and
wire are also all in their duties, did not do any acrylic plate, did not do any painting and cover the skin, but the original car s speakers
blanket material to do their clothes, plus faint blue light, shows a steady and elegant temperament. This seamless style modification,
audio, car, people on this perfect blend.
car audio brands account for 30% domestic market share of around
According to the global authority to monitor the company GFK consumer durables retail market for the latest car audio monitoring
data, China s car audio sales are still growing. Data show that China currently GFK monitored monthly in 10 major cities in total sales car
audio host 33,300 units, representing an increase of 8% over the same period last year.
With the 2005 new car factory to improve the overall staffing levels, sales of car audio as a whole is still growing. Meanwhile, the
overall pattern of the market there are some new changes point, the low-end market began to shrink, while the rapid rise of domestic
brands, have occupied about three percent of the share.
GFK research shows, can only play CD, deck of low-end models the market began to shrink. According to GFK latest monitoring data,
the four major cities in the CD player over last year sales were down 7 percent in Shanghai and Shenzhen have fallen even more to
39% and 21%; the average price from 1200, declining to 1,100 yuan.
At the same time, can play DVD or other type of multimedia software fantastic. Can play DVD or other multimedia software models of
the market by the beginning of 2005 less than 10%, rose rapidly to 23 December 2005. One VCD, DVD host s market share grew to
8% and 3%, liquid crystal display has accounted for 6% of market share, high-end DVD, display one machine has reached a total of
5%. Shows, car audio products have changed in the past people that upgrade to a CD from the deck of consumer trends, to begin
the pursuit of a CD by the pure auditory enjoy the products to video, audio, navigation and other multimedia enjoyment product
“upgrade” of the consumer.
GFK latest data show that before 2005, car audio market, consumption is mainly CD host, the market control in the hands of foreign
manufacturers. As the market changes, the original main overseas manufacturers subcontract, or the main overseas markets, domestic
manufacturers will sell quickly adjusted to focus on the domestic market. With the high cost, a wealth of product structure, market
share of domestic brands in early 2005, rapidly increased to 10% now 31%.
car audio equipment – the way to play music
Music is an art, relying on the art audio equipment is to play out this way, through continuous improvement of equipment, with a
reasonable variety of equipment, in order to finally get a good music.
car audio conversion industry, the main reason resulting from people s love of music. Music can mold character, you can relax, listen to
music while driving can increase your concentration and reduce fatigue. It is precisely because there are many benefits, it makes the
music and the rapid development of automobile industry process is linked, it is the people living in the further advancement.
Most current models on the market are equipped with audio, but professional point of view, the original car is equipped with sound
can only be installed a machine to speak out, can not effect, to determine the texture it. For this reason, many music fans in the car
just after the car stereo will be modified, it means throwing away the old, put on new. Maybe some people think they are purely
children “burn bag”, not to spend money, but if you communicate with them, you will find that they are some of the very mind, work
very rational person, it is because of this, they did not pursue things perfect.
Owners in September 2005, Mr. Liu bought a Geely Free Cruiser, due to his childhood love of music, he just got in the car after the
car went to the converted stores will host speakers to replace all, and adds bass and amplifier, according to his words, “change the
sound to be happy than when that car.” However, the effect of modifications to Mr. Liu was injured. In addition to the host vehicle
was equipped for the JVC brand, others are Hawker series, although the configuration of medium level, but the auto parts store not
only the installation of the city s conversion technology gap, but nothing new on the car audio conversion, let alone for the
equipment with reasonable and accurate positioning of the sound field. Recalled the first modification, Mr. Liu was very excited: “I was
sitting in the car, feel the sound all over the pass from behind, a little sense of hierarchy are not, in the end there is a rape of the ears
is loud music, the feeling.”
Mr. Liu is the only modification to the idea of ??time, through a friend s introduction, Mr. Liu and the bi-weekly audio weeks old
acquaintance, the two hit it off in the understanding of music, old and decided to help Liu weeks to re-build the car audio
environment .
Mood needs:
Mr. Liu, a soft spot for music from an early age, he can Break a variety of musical instruments, in the 1990s with a few friends set off
the band. And he is like the biggest types of characteristic span is very large, from heavy metal to opera, he can hear gusto. So in
addition to a set at home, and effects are very good quality sound, but he hopes to drive the process also enjoy your favorite music.
However, although the principles of sound playback sound are similar, but somewhat exclusive, different brands of equipment for
playback of different music types, not a sound can contain various types of music, which before conversion required Mr. Liu put
forward their own in the car most want to hear the music type, and then asked to choose for this equipment, installation,
commissioning. Mr. Liu, the ultimate idea is to listen to some of the fast-paced music, one to guarantee a clear head while driving, and
second, most of their friends are not able to accept the heavy metal or opera.
Equipment selection:
Proposed a two-week old program, the first set is not to replace the original host, but will focus on the replacement on bass, and bass
replacement after re-wiring and tuning; second is the replacement of the host, replacing bass, plus mounted amplifier, and after re-
tuning in the replacement of equipment, positioning the sound field. Specifically, the host can choose to pioneer P1Y, amplifier can
choose Bo Shida, bass can be considered to focus on the blessing of P2.
The final choice:
Mr. Liu chose the first set at the beginning of the program, only to be replaced by blessing of bass P2, after re-tuning, the overall
effect has been greatly improved than before, but also to Mr. Liu regain the confidence of the audio conversion . However, after
contact with other audio enthusiasts, this audio to find themselves still many areas for improvement, so in less than a week, Liu
proposed the replacement of the host, and the installation of the power amplifier requirements, made the old week second re-
implement the program. In addition, in order to save costs, while in the car watch the DVD, Mr. Liu has installed an equalizer, audio
and video through it for the conversion of DVD video breeze car prices cheaper, and also very effective .
Effects of experience:
Pioneer host ability to read the disk, and the sound quality of transmission is very stable, its stylish appearance that the car vibrant.
Hawker high school after re-tuning the subwoofer positioning, play the best effect, combined to ensure the welfare of the P2 bass
playing fast-paced music in the sense of depth.
The original Hawker amplifier is now the main push high-woofer, a new installation of Bo Shida blessing bass amplifier to provide for the
adequate support. Modified, in playing a strong texture and magnetic properties of vocal music class when the results. Vehicle in the
sound field positioning down a lot of work, learning through music, Mr. Liu told us: before the change in the auto parts after the city
put the music in stereo, all the music feel from the rear, is now finished change After feeling front dashboard is a stage, sound and
orderly introduction ears, so they took the time to listen to a symphony say, can clearly feel the trombone sound from right in front of
you, because I learned long before the number, So this thing is sure.
Future plans:
Then fitted a bass, two treble and two tenor, in the trunk, to install some of the decorative lights and sharp flash, seen in the disco
after the kind of feeling. Most important is the installation of 5.1, 5.1 can not understand at first what kind of effect, then a friend
gave me an example: Suppose there is an enemy fired a shot in front of you, behind you hit a people, have the effect of using 5.1,
you can hear the gun hit the person is lying on the ground that the voice came from behind you, and shells falling on the ground in
front of you voice. Was listening to a friend s introduction, I very much hope that as soon as possible to experience such an effect.
car audio conversion tips audio wiring
As the car audio system for listening listening environments have many adverse effects of impact, so the car audio system installation
wiring put forward higher requirements.
1 choice of car audio wiring
(1) the smaller car stereo wire resistance, power dissipated in the wire the less, the higher the efficiency of the system. Even if the
wire is very thick, as speaker itself will cause some loss of power, without making the overall system efficiency of 100%.
(2) the smaller the resistance wire, the greater the damping coefficient; damping the greater horn of redundancy, the greater the
vibration.
(3) wire cross-sectional area larger (more coarse), the smaller the resistance, the tolerance of the line current is larger, allowing
greater power output.
(4) Power insurance options. The main power line fuse box near the car battery the more the better, the size of the insurance value
to be determined according to the following formula:
Insurance value = (total system amplifier power of the set and × 2) / average vehicle power supply voltage
(2) the audio signal line wiring
(1) the audio signal with insulating tape tightly wrapped around the cable joints to ensure insulation, joints and body when in contact,
can produce noise.
(2) to maintain audio signal lines as short as possible. The longer the audio signal line, the more susceptible to noise interference.
Note: If you can not shorten the length of the audio signal lines, long part of a fold, not roll.
(3) audio signal line wiring to the computer unit and leave the driving amplifier s power cord at least 20cm. If the wiring is too close,
will pick up the audio signal line to the sensor noise. Best audio signal and power cables separate from the driver s seat fabric on both
sides of the driver s seat and vice. Note that when close to power lines, wiring micro-computer unit, the audio signal lines must leave
them more than 20cm, if the audio signal and power cables need to cross each other, we suggest the best intersection of 90 °.
3 power line wiring
(1) the selected value of the power cord of the current capacity and the power amplifier should be equal to or greater than the value
of connecting the fuse. If you use sub-standard wire for the power cord, AC noise and will produce serious broken ring sound.
(2) When using a separate power cord to the number of amplifier power, from the point to separate wiring of each amplifier should
be the same length and structure. When the power line bridge, the various potential difference will occur between the amplifier, this
potential difference will lead to exchange of noise, which severely damaged the sound quality. When the host directly from the power
supply, will reduce noise and improve sound quality.
(3) the power supply (battery) connector completely remove the dirt, and tighten the connector. If the power connector is dirty or
not tightened, there will be contact resistance joints. The presence of contact resistance, the exchange will lead to noise, thus
seriously undermining quality. Frustration with fine sandpaper and remove the dirt joints.
(4) When the vehicle power system wiring should be avoided in the vicinity of the generator and ignition wiring, alternator and ignition
noise can radiate noise into the power cord. When the factory-installed spark plugs and spark plug cables into the high performance
type replacement, stronger spark ignition, the ignition time will generate more noise.
(5) cloth body in the car audio wire power cord and fabric of the same principles.
4 methods of ground
(1) body with sandpaper to remove paint at the ground clean, the ground wire fixed tight. If the body and the ground between the
residual paint will make the ground produce contact resistance. And the previously mentioned power connector similar to the color of
dirt, contact resistance will lead to the generation of AC noise, which seriously damage the sound quality.
(2) the sound system in each module of the ground in one place. If you do not focus on them a grounding, sound exists between
the various components of the potential difference will lead to noise generation. Note: The host and amplifier should be grounded
separately.
(3) When current consumption is large, the battery ground must be firm. Improve the power performance of the method is grounded
in the power and ground wire between the use of large diameter cabling, such as twisted strands. This connection can be
strengthened to effectively suppress noise and improve sound quality.
(4) Do not close to the trip computer wiring. Remember, the host computer ground point near the ground vehicle or fixed point, the
computer will generate traffic noise.
The classification and the role of the speaker magnet
Magnet is to provide energy product the size of the foundation. Now the popular car audio market with the ferrite magnets and
magnet generally NdFeB magnet:
Ferrite magnet: is the most common magnet, which is formed by the sintering of iron oxide; As a result of the purity of the different
magnetic field strength of different sizes, due to the strength of a magnetic Y20 to Y35 of the hierarchy, the general The table is
based on the magnetic strength of magnet to distinguish, Y20 level of the lowest, Y35 highest. The disadvantage is that a larger
body, fragile, and low coercivity is relatively easy to demagnetization.
NdFeB magnet: iron is added in the rare element neodymium, boron and other elements made of cast high coercivity of the magnet,
because of its high coercivity, resulting in easy magnetization or demagnetization, requires special charge magnetic machine to
magnetization. It has small size, the characteristics of high magnetic field strength, but influenced by temperature because of its
relatively large, in general, to over 75 ℃, the magnetic field strength with increasing temperature, decreased significantly. Now the
market has started to heat NdFeB magnets is high temperature and magnetic field strength for the decline in R & D out of the
product.