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Car horn how to carry out routine maintenance and overhaul
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outdoorspeaker – China Manufacturer
Thank you for inquiry my outdoorspeaker, Tel: +86.573.8468.1673, E-mail: futuresound@mailzj.cn
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The car horn is the frequent use of the device while driving, if the speaker fails, the car will be very inconvenient. Sometimes according to the speakers, the sound is not like a mosquito called, is very hoarse, even voice. This is exactly what is causing?
Let\\ s look at the speaker is how it works. When the horn button press on the steering wheel or other location, the current from the battery through a circuit toward the horn relay, solenoid coil, solenoid coil to attract the moving contact of the relay switch is closed, current will flow to the speaker at the . The current speaker internal electromagnet, so that the diaphragm vibration and sound.
According to the author\\ s experience in many speaker failures, there is a problem often is the fault of the speaker itself. In particular, speaker installation location of some of the automotive design is flawed, and very easy to make the speakers to rain water when it rains, causing damage to the speaker. Common parts of the fault when the speaker does not ring, no more than 3:00, that is, the speaker itself, the speaker switch contacts, as well as the speaker wiring harness, when failure to refer to the following steps to check.
Sometimes does not ring horn switch, if the speaker is sometimes loud and sometimes does not ring, multi-speaker switch contacts within the contact is not good, but also some of the speaker itself.
Second, hoarseness multi-plug connection is bad, especially the steering wheel around the various contacts, due to frequent use, easy to make contact frayed.
Three and did not ring the first to check the fuse to see if the fuse, and then disconnect the speaker plug with a multimeter to measure whether there is electricity here in the horn switch. If there is no electricity, should check the speaker wiring harness and horn relay; if there is electricity, the speaker itself, then you can try to adjust the adjusting nut on the speaker, if it does not ring, you need to replace the speaker.
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DIY car audio noise conversion of the modified
Do car audio noise after conversion conversion there are many reasons, some people in order to upgrade their car audio, car noise,
some people are too much. But for whatever reason, the car owners, converted audio conversion price of the market do not sound
cheap, especially to do the whole car noise, no more than 5,000 do not work. On the contrary, make their own noise conversion is
another matter, in fact, the owners not only save money this way, you can get a DIY sense of accomplishment.
Engine noise sound-absorbing cotton attached hood and firewall
Engine room sound insulation, sound-absorbing cotton to buy a block wave (sub-fire with no fire protection, fire more unpleasant
taste), buy spray cans. No heat in the engine room when the spray, then sound-absorbing cotton affixed to the hood.
In order to obtain better sound insulation, engine room fire wall can block sound-absorbing cotton pad or shock absorbing system, the
method is the shock absorbing pad of cotton or cut a small piece of the system (due to the engine room fire-wall clouds and
therefore need to cut pipe into a small piece), depending on the size of the actual situation of their car or the system pasting shock
absorbing cotton pad to complete the engine room noise, engine noise can effectively inhibit the incoming car.
Doors, door frames and other noise, and noise of the joints attached
Door noise, or noise can buy cotton insulation tape or insulation wool felt attached to the door of the seams, to complete the door
insulation. As a result, can effectively suppress wind noise and some noise of passing car.
Need some soundproof door disassembly techniques, such as door handles need to remove a screw in place, and finally removed to
the door, the whole project is not large, the use of that skill on it. Remove the door and the door at the location or the system
pasting shock absorbing cotton pad, and then loaded on to complete the door insulation. This can effectively reduce or outside the
car door because horn noise caused by vibration or noise, but also to enhance the acoustics within the room.
A, B, C pillar and roof insulation election paste filling foam sound-absorbing cotton or
A, B, C pillar sound insulation, reinforcement. The A, B, C-pillars with PU foam filling voids of about 40% of the blowing agent (as it will
foam expansion), can effectively prevent the metal vibration caused by the different tone and increase body rigidity, completion of A,
B, C pillar sound engineering.
Car door fixed noise (that is, we go to car repair workshop, car top up that place), open the car door set trim, a split latch latches,
screws with screws removed, and then point Kunugi the plaque with the brute force Remove the. Remove the latch from the hole
on the PU foam filling, about 40% can be (as it will foam expansion), this would effectively prevent resonance caused by the different
metal sound and chassis noise, increased body rigidity and more complete the car door fixed noise.
Roof, ceiling insulation, the latch can be removed the screws are removed, and then paste the sound-absorbing system shock
absorbing pad or cotton, so can effectively inhibit the roof caused by rain due to vibration or noise.
Interior noise chassis disassembly required professional guidance complex
Interior noise is noise in the chassis, the most difficult project, proposed to the stereo shop or repair shop for a professional help, you
can buy their own materials, spend time charge. Otherwise, because of lack of understanding of the disassembly and assembly of the
differences caused by sound, but sound can not be caused not only across the different sounds it is just the opposite of the
assembly.
Indoor carpet chassis noise must be open, be demolished door set trim, seats, center console. Plaque with screws removed screws,
not to use the point Kunugi removed. Part of the demolition to be split, rear seat side chairs generally have a fixed latch open or have
a fixed ring pull, and then paste in the interior of the chassis part of the system of shock absorbing pad, and then paste mixed flowers
cotton insulation or sound-absorbing cotton.
Note that when the materials posted do not block noise screw hole, then put the site has been open that can restore the advantage
is effectively inhibited by driving the car caused by traffic noise coming from the chassis.
Outdoor chassis split fender acoustic PU foam filling
First, the noise outside the chassis in the engine room fender screws removed, filling the PU foam, about 40% of the blowing agent
can be (as it will foam expansion), so you can effectively reduce tire noise, but also can enhance body rigidity. In addition, you can also
remove the plastic piece underneath the leaves board, paste or spray on a cotton sound-absorbing insulation paint, driving the wheels
can effectively inhibit the chassis caused by noise, the noise is the most effective method.
Special development trend of car audio car
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 direct release to the maximum extent of market demand, and this process will continue the momentum of inertia
was first-class development. 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 a case, but in the long run, private car is the breakdown of the domestic automotive supplies market needs, but
also can 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 stereo equalizer in the role of
1, the sound system used in the purpose of graphic equalizer
Already has a host – Amplifier – speaker these basic sound system, in order to improve the sound quality of this system and regulation
of the more detailed, more complete the music player, will join the equalizer in the sound system.
Sound system used in graphic equalizer (Graphic Equalizer) audio can be improved in some bands or attenuation, it is intended to
correct room acoustics and speaker inside the amplitude-frequency characteristics of the defects, or to polish the sound processing,
you can locate the car in and around the sound field to make adjustments to suit personal preferences and enhance the sense of the
scene. Frequency equalization (Frequency-response equalization, also known as balanced Equalization or correction balanced Corrective
equalization) circuit, which is in the sound system in order to get a flat overall frequency response, for some correction or adjustment
of the signal transmission frequency characteristics of a network circuit, it can be taken to distinguish between the various frequency
method, resulting in a flat overall frequency response. Such as the Kenwood DPX-8020MD with its own internal 11-band graphic
equalizer circuit, is a typical example, as well as host internal amplification circuit, also has a different frequency equalization.
2, the sound system to use the graphic equalizer in either
Graphic Equalizer has been all the rage, a sound combination of essential parts, but it disappeared a few years ago, almost nobody
cares. There are many reasons, first of all most of the goods of poor quality of the graphic equalizer on heavy burst will produce
discernible additional distortion and noise, reducing the overall sound quality. Second, if used improperly, the balance often makes
heavy burst damage, resulting in heavy burst frequency over the muddy, dull and lacking mid and high frequency of excessive and
harsh. The pursuit of HiFi sound quality for the lovers, are intolerable, and now with the popularity of audio and knowledge increase,
the sound quality has very good ability to identify, graphic equalizer fans will gradually be applied to Hi-Fi arena. As the graphic equalizer
is given in the appearance of a beautiful feeling, like young people to pursue the goal, pay attention to the most beautiful screen,
choose the host with a graphic equalizer. Now the host is generally 2DIN with graphic equalizer. However, for fans of Hi-Fi is not
recommended to use this host, because the host has done a modification within the source, so the listener is not the pursuit of
quality, as a general appreciation is possible.
3, how to use the equalizer for sound compensation
In recent years the host of many brands such as: SONY, KENWOOD, VDOdayton, to listen to in order to obtain a sense of comfort, to
set some special effects to produce a frequency compensation deal with EQ, a variety of preset tuning mode, suitable for playing
different songs to create a sound effect, providing the perfect sound environment for non-professionals do not make timely sound
field adjustment disorder, just press the button you can reach a preset preset effects, such as ROCK (Rock), VOCAL (vocal), CLUB
(club), NEW AGE (avant-garde), POP (pop), JAZZ (Jazz), CLASSIC (Classical music), etc. Frequency of the sound source for the
principle of compensation is not affecting the loudness of the melody played, even if the volume is large, we can not make people feel
uncomfortable. According to the most perfect combination of personal preferences to the effective environment.
Bazhao teach you the strength to play a subwoofer
Sound pressure is the sound of the sound waves from the successive spread, have pushed for action and the formation of air
pressure, the smaller the space, the greater the pressure, the lower the frequency, the greater the pressure, the more speakers and
more amplifier power output sound pressure will be greater. How to increase the pressure between it? You can consider the following
directions:
1 model
The choice of car is an important factor in selection of models can be directly ventilation is more favorable, such as the hatchback (five
vehicles) or three trucks, and sport utility vehicles (RV) are a good choice, car noise effect, and the thickness of iron also affects the
size of the sound pressure, large-scale system is selected if it is relatively easy to play van, the other speakers and speakers can be
installed location and space, but also considerations of.
(2) the number of speakers and amplifier power
a) the number of speakers has been limited (2-3) can not increase
In this case, increase the subwoofer s power to bear to increase the output power amplifier, speaker series and parallel impedance
after the best bass amplifier is equal to the minimum tolerance impedance amplifier that allows full play.
b) an unlimited number of speakers
In this case, your system must consider what is the purpose, goals, where reasonable, if space allows, try to increase the number of
speakers, while increasing the number of amplifier, the total output power amplifier, subwoofer can be greater than 25% of maximum
power handling.
3 Select the type of speakers
Monomer on the same speaker on different speakers to the same amplifier output power to drive, sound pressure will be different,
reflective of the speaker s higher than the closed 3 ~ 4dB, however, more reflective of the volume great power to bear than the
closed lower, if the amplifier s output power is not, select the type of reflection would be more favorable.
4 Materials and Structures
High-density low-density board speaker is better, plywood is not suitable for the air too, another transparent acrylic speaker, if the
acrylic part of the area is too large price cuts sound pressure, sound structure must be strong, the joints between wood must fill
white glue, can not have leakage phenomenon, another outlet end of the rubber pad with the best in order to increase
microleakage.
5 power considerations
Calculate the total power consumption of the output current multiplied by 0.65 for the average current consumption and increase the
amount of power generators of electricity, close to the average amount of current consumption is better, plus with a battery, to
increase the number of drop foot using a multimeter file or micro-ohmmeter, measure to find the best ground to improve power
efficiency.
6 subwoofer choice
Xmax is the maximum value for speaker cone process (movable distance), the higher the number, the larger the power to bear, the
larger the sound pressure generated, Xmax doubled to 6dB more output, but relative to the input Power to increase 4-fold, choose
the larger value range speaker sound pressure is relatively large, larger cone area, the larger the sound pressure.
7 the effect of body closed
If there are many gaps through the car to the outside, not the cumulative increase in sound pressure, so when the test sound
pressure must be isolated from air leakage, such as air conditioning vents, shift lever, door, drain holes and so on.
8 music track body options
In addition to the conditions in their own equipment, music recording signal strength is more important to find the strongest low
frequency speaker to signal the nearest subwoofer bass music, the highest signal frequency, so the sound pressure will be greater.
Bass music signal intensity is not uniform, only to find many more strong signal input sound system.
How to Select a car horn
speaker, car audio host is the most important part, just like the human brain, what kind of sound to be issued, may be controlled by
the brain. The speaker is like the human voice, the sound is sweet, it is necessary to see how the voice.
Speaker known speaker, its role is to convert the audio signals to acoustic signals radiated around the air medium. Car speaker cone
design with the most common, which is installed in the vehicle because space is limited in the case, tapered design can be expanded
as much as possible the effective area of the diaphragm, and diaphragm determines the effective area of the low-frequency response
speaker . In other words, tapered design can not install bass case, bass.
Accordance with zoning, the speaker can be divided into full-frequency, low frequency, medium frequency and high frequency of four
kinds. Form of energy conversion can also be divided into electrical, electromagnetic, piezoelectric, electrostatic and tablet, electric
vehicle to the main speaker.
That is coaxial speakers full-range speakers, it s woofer and tweeter is designed in the same center line, the outside is low, the inside
is high, but the vocal point in the same physical location. This design can eliminate the high and low frequency units due to the
frequency range of different sounds caused by drift, but because of the high, the bass is emitted from a point, so the larger the
distortion sound.
Divided into 2-way loudspeaker frequency and divide by 3, 2 divided by the tweeter and woofer components, divide by 3 is coupled
with the midrange unit. Because each unit is responsible for different frequencies, broaden the frequency range, so as to solve the
problem of sound distortion. However, because daily life, we hear the sound basically sent from one point, while the frequency
emitted by the speaker frequency of each unit, the installation of the physical location are different. In this way, there will be voices
drift phenomenon. In addition, the high, although the bass unit is responsible for different frequencies, but it is bound to the
existence of a critical point, so in a different position, given the same frequency, will produce acoustic interference.
To solve these difficulties, we must use the role of divider. Crossover As the name suggests, is to separate the different frequencies,
and sent to a different speaker unit. Of course, its function is not only this, it is also based on the characteristics of the speaker to
make proper adjustments in order to reduce distortion and interference.
Nominal Impedance: speaker at a particular frequency when measured at the input impedance value, it is the speaker sound system
with other parts of the important parameters match. If the data and power amplifier with a nominal impedance, there will be sound
distortion.
Sensitivity (SPL): When the speakers with 1W power of noise signal in the axial direction of the sound pressure level measured at 1m,
which is reflected in the size of the speaker sound performance skills. When the optional speaker, to try to make both sides of the
consistent values (within ± 1dB control), or there will be very clear sense of focus.
Man that each find a new car stereo dealer, you can get new information. No one thought, different stores recommended
merchandise, are there so many the same things. Such as the host inside the Alpine and Sony, and the speaker of the MB. Two
stores are located in Beijing s north and south ends, and their manager recommended the same brand, the market still seems to
occupy a certain weight. But through these two interviews, I found the price difference between the different stores is still very
large. There are audio conversion needs a few owners may wish to look at, look at market conditions, as in the modified time “pay
back the money in place” to prepare.
small car World Audio conversion of the Swift articles
We usually say is different from the audio conversion modification, retrofit projects it contains nothing more than the host, power
amplifier and loudspeaker products, replacement, modification, compared with the vehicle performance is not very complicated, but it
also has a significant difference with the performance of local modifications. Audio conversion requires a clear understanding of the
owners converted the demand for technicians, and according to the owner of demand given the price reasonable, elegant solution to
the configuration, and then through his years of experience in various parts of the sound installation, tuning, positioning, until finally
meet the owner requirements, from this perspective, the audio conversion but one thing is not so easy.
Today, we want to introduce this car Swift, after two times modified, and finally to the owner the satisfaction, but this is just the
beginning, with increasing levels of car owners enjoy, audio conversion of knowledge over time, further improvement configuration is
the way to improve the sound.
Owners introduced
I personally very interested in music since childhood, it used to playing audio equipment at home, then busy with work, and more time
outside together, had worked with a car, a good layout of the car stereo and let me in can enjoy music outside. We can say that the
impulse to buy a car from my pursuit of music.
Although the model was not laid down, but I have begun to turn sound up everywhere. Converted from Auto City to shop, a full run
dozens, Everywhere will be some of their own ideas, and an acceptable price range, told the store, so they gave me a set of
conversion program. Although the program more, also a large choice of surface, but from which I also found some problems, many
stores have a certain lack of knowledge of audio conversion, they can be regarded as first-class assembly technology, but in the tuning
and positioning, is the absolute outsider, which makes me feel a bit disappointed. But later, through the show, I know several very
powerful audio conversion shop, communicate with them, I not only have increased the understanding, and eventually established a
conversion program.
Personally, I prefer to rock, after the first modification, in effect, has reached my request, but talk to a few friends in the same
modifications to the audio out to play a few times that, in addition to the pursuit of audio conversion effect, the layout whether
beautiful or not is to examine the conditions of professional audio conversion. After a lapse of two months, I conducted the first 2
modification, the main purpose of the modification is to change the layout of the vehicle s appearance on the extent of the box after
one week to build, now looks more professional. Recently modified with the preferences of friends contacts, I made my third step of
the conversion plan —- to increase the number of bass speakers. At present the effect of bass has been unable to get my ears
satisfied, I intend in the next phase, focusing on the bass to make an effort to get my car stereo sounds more shocking, more
strength.
Equipment introduced
Host: Pioneer DEH-P1Y
Pioneer s DEH-P1Y is a major host, using a single large knob with smart controls to facilitate neat, new blue OEL display can produce
more clear than previous generations, more beautiful lightning blue. DEH-P1Y all the blue light button is also used to make panels more
personal, more coordinated exterior color, the operation more convenient.
Amplifier: to blessing 400.4 a, 360.2 a.
Crawford s most famous product is the amplifier and subwoofer, like Swift amplifier used in these two belong to the blessing, although
entry-level amplifier, but its performance or even higher than some of the brand s top products. One for the Road 400.4 amplifier,
pushed forward treble speakers, 360.2 for the loop amplifier, push the two bass.
Bass: Fu-P2 series to two 10-inch bass. It reflects the rock was the most direct playback components.
Vehicle noise: American energy.
Large noise is present on the market to the more popular silver brands, which can effectively minimize noise inside the state.
Effect introduced
Host a full-featured, easy to operate, is the owner in order to preserve the original car host, the host will be placed into the new
center console lower, affecting the appearance. Bass sound simple and honest, when people play rock music to enjoy while in the full
sense of the “metal” taste, and to the blessing of expertise is the bass player rock, the effect of correction than the other brand bass,
no noise. Blessing to the same amplifier when playing rock provide strong support for the bass.
There are two shortcomings: insufficient number of bass, power is too small; vehicle noise effect remains to be further improved.
Highlights modified
Swift car configuration contains the original car steering wheel audio controls, the replacement can not be used after the new host,
the owner in order to keep the control key functions, specially made to order one from the factory side of the receiver, but the
receiver is a new product, change the line during the installation, no information can refer to, can only be modified by trial and error
with the technician, just a few minutes to install on the small box, change the line in it took a full 2 ??days 2 nights time.
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%.
luxury cars made several original sound evaluation report
Passat: strong and powerful bass
Passat of the solid body structure, very thick door and double door design, the effect of noise makes the whole car is very good. To
install speakers in the doors, double doors into the space between the actual resonance speaker box out of the bass would be more
strong and powerful. Meanwhile, as a typical European car, the Passat in the original high-frequency sound for a good deal, it is
suitable for listening to classical, ordinary voice and softer, lyrical music, but not good at expressing similar disco or heavy metal.
Host host with European-style design, knobs and buttons are relatively small, it seems very delicate. The function keys and intuitive
design, the operation is relatively simple, such as the 1-6 number keys, representing 1-6 discs, we can say at a glance. In addition, the
knob design is also more suitable for driving operation.
Speakers take into account the larger Passat interior space, plus the door is a double structure, so the factory installed in the front
door split a pair of two-way speaker kit: 1 inch core 15 is installed in the tweeter behind the rearview mirror door triangle position, 6-
inch bass speaker is mounted in the door inside. Installation is also a back door way split of the two speaker kit, but one of a pair of
bass speakers are not installed in accordance with traditional baffle below the rear windshield. The reason is that the traditional
approach, if the sound is too large, rear passengers will be the formation of a great noise, but the speakers installed in the rear
position, are more likely to listen to the music of various musical instruments and the level of positioning , and we listen to this concert,
used to the sound coming from the front as simple as that.
Rated sound system: 3 points; listening space: 1; body structure: 2 points; score: 6 points.
POLO: to make up for lack of space
POLO s body is short, relatively small listening room, but manufacturers can focus on the actual situation in the horn installation position
to do some special processing to make up for lack of space. Lo POLO car audio system that does not listen to some of the low-
frequency, normal pop songs is still very good.
Passat of the host and the host and there is not much difference.
Speakers by listening to space constraints, so the original POLO car stereo, then the door is not installed speakers, but still reserved for
the speaker position, providing a future upgrade of the sound space.
Front door is a pair of two-way split speaker kit. The location of loudspeakers installed in the door is not at, but to install it on the
instrument panel with the A-pillar is connected. Why? Mr. Lu said, as if the loudspeakers installed in the Passat car, as if at the door,
space for a small body, because passengers ears are too close to the speaker, listening to the sound from there will be a pressure.
The POLO car dashboard has been extended forward, the tweeter is located in the instrument panel junction with the A-pillars, this
treatment would be more natural sound.
But Mr. Lo also mentioned a little regret, that the factory-installed loudspeakers and did not try to do when the angle of adjustment is
done because there is no artificial sound field positioning, put out the sound more casual, there is no point of view. If the angle of the
tweeter to make some adjustments, then, like the left A-pillar of the speaker towards the co-pilot the position of the B-pillar, on the
contrary the right A-pillar of the speaker toward the location of B-pillar, the driving position, this way, the sound will come out in the
instrument sets the position of the middle facing the host, to create the best listening position, then all the better.
Rated sound system: 1.5 points; listening space: 0.5 points; body structure: 2 points; score: 4 points.
Audi A6: host unique
Audi single-layer structure of the door, making the sound performance of the low-frequency sound will be lacking, but the factory
speakers by adding low enough to make up, making the overall sound quality is good. IF people for playing the sound of jazz, classical,
etc., but not for metal rock music.
Audi A6 host host host than the general standard to be wider, the volume control knob design in the middle of the host, more
humane. A special place, the host is hidden, and cherry wood trim also covers the outside, use, cherry wood trim auto away, exposing
the host, so that one car interior look more upscale, the other hand, the host is not easy to stick ash, can be kept clean.
Speakers front and back doors installed is a pair of two-way split speaker kit. Audi A6 and Passat models of different mass, it is a single
door structure, the speaker can only be installed in the decorative board, because the air inside the scurrying, it would be more space
to play bass, plus the body is relatively large, bass not ideal. But the designers were clever cover, installed in the location box
underwent a low-power amplifier with speaker, bass less than the original car design remedial back, making the low-frequency full,
layered better overall sound quality are good.
Rated sound system: 4 points; listening space: 1.5 points; body structure: 2 points; score: 7.5 points.
Polaris: Young positioning
Listen to more compact space, double doors, sound insulation is better, listen to music better. The speaker installation approach,
enabling more powerful low-frequency, for listening to pop music.
Host host and Passat are the same, high-end models with six-disc CD, popular models with single disc CD.
Speakers front and rear doors are two-way split speaker kit, the young people meet Bora positioning, a strong low-frequency effects
out.
Rated sound system: 3 points; listening space: 1; body structure: 2 points; score: 6 points.
- Grading
Total score of 10 points, including sound system is divided into 5 points, 2 points for the listening space, the body structure of 3
points.
I believe we share on the sound system there is no objection, but why listen to space, and especially to the body structure as an
important scoring standards? Very simple, perfect sound system to match up again, if you want it to release soothing words, the
premise must be the car to have a perfect listening space. Body structure sucks, then the noise inside and outside the car all-
pervasive, enjoy the music can only be talk about the.
car audio switching power supply schematic (1)
Vehicles have begun to enter our family, the superior performance of high-power car audio more and more popular. Before
electricity is direct access to car audio 12V lead-acid batteries, so the pulse car ignitions, and other audio interference will directly
become a major source of noise. 12V low voltage single-supply is also limited to audio output power, power amplifier OTL circuit can
only be used, frequency response is poor. With the development of components and technology, switching power supply can be
used in car audio completely. It provides dual high voltage power supply, and can inhibit a variety of noise fleeing, OCL circuit amplifier
circuit is also used to make the grade on a real car sound, car audio application switching power supply in line with technological
development.
Figure 1 is a car audio switching power supply circuit, the circuit mainly by two IC TL494 and KIA358, drive pipe Q702 and Q703,
switch M704 ~ M709, transformer, output rectifier and filter and other components. TL494 is an integrated pulse-width modulation
type switching power supply controller, the maximum drive current of 250mA, operating frequency 1 ~ 300kHz, selectable output
push-pull or single-ended form. Internal block diagram shown in Figure 2, details of reference TL494 PWM control circuit. It mainly
consists of a triangular wave oscillator, two comparators CMP1 and CMP2, two error amplifiers A1 and A2, 5V reference voltage source,
trigger, and output drivers and other components.
Triangular wave oscillation frequency from 5,6-pin external Ct, Rt decision, the oscillation frequency fosc = 1.2/Rt × Ct, triangular
wave oscillation signal to the two comparators, respectively, that dead time comparator and PWM comparator, the comparator output
to two or gate. Thus, only when the oscillation amplitude of the signal level is also higher than the dead-time control level and the
error input level, output level or gate turn has generated. Pulse output by the flip-flop output control and 13 feet, 13 feet to low
internal trigger useless. This circuit is 13 feet to high (14 feet from the reference voltage 5V), two pulse outputs Q and Q,
respectively, controlled by the trigger, or by two doors and push push-pull output, maximum output pulse duty cycle 48% frequency
of the triangular wave oscillation frequency of the half. Dead time set by the voltage of 4 feet, between the range of 0 ~ 3.3V. As
the output voltage error amplifier A1 sampling error amplifier, PWM comparator results by the output voltage pulse width control. The
error amplifier A2 as a protection control with 15 feet to the reference voltage 5V (provided by 14 feet), 16 feet for the control
input. In the boot protection, overtemperature or overcurrent protection, 16 feet high, then the error amplifier A2 output is high,
the level is higher than the triangular wave oscillator amplitude level, leaving the driver does not drive pulse output , load security
blackout.
Safety protection circuitry to complete the circuit by the KIA358. Abnormal situation provided to the TL494 s 16 feet high. KIA358
dual op-amp circuit