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The choice of audio amplifier
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amplifier is the heart of the sound system, the size of the power amplifier, the quality is
good or bad music player plays a vital role. Ordinary car amplifier design in the host, the
general power of 10W ~ 45W, but this does not listen to multi-level high-power digital
music, in order to make the sound to achieve the best results, we must add a separate power
amplifier in the system, the rose to power supply 12 volts to 35 volts to 45 volts to
promote high-voltage high-power speaker, so dynamic range increases, the music can be more
perfect play.
The wiring of the power cord
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(1) the selection of the current capacity value of the power cord should be equal to or greater than the amplifier phase insurance value. If less than the standard wire power cord will produce AC noise and severe broken ring sound.
(2) when separated with a power cord to the amplifier power supply from separate points to the length and structure of the amplifier wiring should be the same. When the power cord bridge between the various amplifier potential difference, potential difference will cause the AC noise, which severely damaged the sound quality. When the host directly from the power supply will reduce noise, improve sound quality.
(3) complete removal of the dirt of the power supply (battery) connector and connector tighten. If the power connector is dirty or not tighten, joints, contact resistance. The contact resistance will lead to the AC noise, which severely damaged the sound quality. To clear the junction of the dirt with abrasive paper and fine fell.
(4) when the wiring in the vehicle power system, should be avoided alignment in the vicinity of the generator and ignition, generator noise and ignition noise radiation into the power cord. Replace the factory-installed spark plugs and spark plug cable into a high performance type, ignition spark stronger, then more susceptible to ignition noise.
(5) the principles in the car body cloth, power cord and fabric audio cable.
To see large unknowingly hurt hearing
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Interview experts: Jiangsu Province People\\ s Hospital, Department of Otolaryngology, Chief Physician, Professor Bu line width
Subway, bus, wearing headphones to listen to the music young people everywhere, in a noisy environment and carve out their own temporary Fang Anjing one of the world.
Cinema, large competing staged, packed, people enjoy the thrill of the pursuit of audio-visual.
Chinese New Year, there will always be fireworks to add to the fun …
But you know, the \"Walkman\" maximum output of up to 105-120 decibels, the noise intensity in the cinema up to 120 decibels, the sound of firecrackers of up to 140 db, and if the noise is more than 1 minute and 30 seconds of exposure intensity of 110 db or instant contact with the noise of 140 db, as soon as hearing loss occurs. China\\ s famous ear and audiologists, the President of the Center of the WHO cooperation for the prevention of deafness and hearing loss, Jiangsu Province People\\ s Hospital, Department of Otolaryngology, Chief Physician, Professor Bu line width appeal to the general public to protect your hearing, healthy ears.
Electronic noise hazards are surge
In recent years, lead to deafness due to environmental noise pollution has been growing steadily, according to WHO statistics, in all human deafness etiology, noise after aging, came in second, accounting for about 37%. From the physiological point of view, any interference with people to rest, study and work the sound of unwanted sounds, collectively referred to as noise. Common noise include the following: industrial noise, such as industrial production machine rotation, vibration, mechanical noise; traffic noise, whistle sound, the noise of train travel; musical instruments of social life, noise, dance halls, discos tone, household washing machines, air-conditioning noise.
China is in the modernization, industrialization, urbanization and rapid development of large-scale urban and rural construction of industrial noise, construction noise, transportation noise and social life noise surge. In addition to these, the popularity of personal electronics audio products also noise pollution have increased. \"Walkman\" maximum output up to 105-120 decibels, the noise intensity in the cinema up to 120 db, the public to enjoy the lifestyle at the same time, it may have to make the hearing has been compromised.
Noise damage is systemic
The noise is a class cause irritability or volume is too strong and harmful to human health voice. Strong noise environment does not take protective measures will not only lead to permanent hearing damage, and the various systems of the body will have a serious impact. Noise damage and its extent depends on the noise intensity and exposure time. Continuous exposure to 85 db above the noise environment may cause hearing loss, hypertension, insomnia, digestive disorders and other diseases, harmful to students\\ learning and behavior. If the contact strength of 110 db of noise more than 1 minute 30 seconds, or instant contact with the noise of 140 db, it will immediately hearing damage occurs.
\"Walkman\" should be used in a quiet environment.
In normal life, pay attention to reduce the hazards of the \"electronic noise\" is very important to protect your hearing. To pay attention to in their daily lives to reduce the volume of radio, television and other audio equipment, try not to press the car horn, not loudly, as little as possible to participate in a noisy sports and less listening to rock music. \"Walkman\" should be used in a quiet environment, try not to be in the subway and public spaces, noisy place with, do not open up the volume to stimulate the pursuit of trying to cover up the ambient noise at the expense of their own hearing. Experience has shown that: use Walkman not hear others talk, it means that too high a volume, it is timely transfer of small, but not after prolonged listening.
Appear immediately after noise exposure, such as tinnitus or ear still muffled feeling, or are able to hear the speech does not understand the meaning, we must guard against noise damage, you should go to the hospital.
Links: environment, some sound decibel
Whispering: 30
Quiet offices, libraries, housing: 40
Rain, refrigerator, office: 50
Washing machines, air conditioners, electric shaving :50-75
Normal conversation was: 60
Vacuum cleaner, hair dryer, alarm clock :60-85
Toilet :75-85
Telephone call, doorbell, whistling kettle: 80
Noisy hotel, a blender or food :80-90
Motorcycle, motorboat :95-120
Walkman :105-120
The highest volume of the TV, car horns, disco, infant crying, or front of the ear shouting: 110
Car audio, cinema, gym, band: 120
Electric drill, electric percussion, noisy toys: 130
The plane took off, firecrackers :140-155
Shooting, artillery :160-9,170
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Or else use equalizer audio mix
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The sound system used in the graphic equalizer (Graphic Equalizer) can enhance the sound of certain frequency bands in the frequency or attenuation processing, its intention was to correct room acoustics and speaker amplitude-frequency characteristics of defects or polish processing of sound, to accommodate personal preferences and enhance the sense of the scene.
A few years ago, graphic equalizer has a passing fad, become an essential component of the audio mix, but in recent years has disappeared, almost nobody cares about. There are many reasons, first home graphic equalizer poor quality of most commodities, heavy burst will produce a discernible additional distortion and noise, reducing the overall sound quality. Secondly, if used improperly, often re-burst balance damage, caused by heavy burst into the low frequency of excessive turbidity, IF lack gloomy, high-frequency excess rough. For lovers of the pursuit of HiFi sound quality can be tolerated, along with the popularity of the audio, awareness-raising, home graphic equalizer will gradually withdraw from home Hi-Fi arena.
Amplifier has been to interfere with the power transformer clever
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Power transformer by the magnetic field, electromagnetic induction and the circuit of the amplifier form the interference is the largest source of interference in the sound machine. Therefore, to properly handle its working condition and environment, in order to effectively avoid the interference generated by power transformers, so that the amplifier to get good sound. Following which I will do a discussion with you.
In addition to the amplifier power supply, power transformers, but also the ability to amplifier and power supply coupling up the power grid in the source of interference into the amplifier, also the voltage generated by the amplifier current changes in reflection to the grid. In order to cut off the electrostatic field between the windings and capacitive coupling, isolation and common mode rejection of the resulting interference, to avoid common-mode voltage of the grid or circuit coupled to the secondary or primary to go on audio power transformer winding and Faraday electrostatic shield is critical. This shield layer alternates between the copper foil can be together like structure, in short, on the winding (especially the primary winding) surrounded by the more common mode rejection, the better.
2, the interference of the magnetic field generated by the power transformer has been plagued amplifier to improve the quality of pure power, from its magnetic field sensor can also cause a serious decline in amplifier quality. Magnetic shielding isolation cover the high cost of (or even higher than the transformer itself, which is the number of imported transformers price Habitat reasons for the high), domestic machine is rarely used magnetic shielding isolation shield to cut off the transformer magnetic interference, many just a simple tin cover isolation, or even simply the transformer bare install, so I can not be effective magnetic shielding. Foreign high-quality transformer often the structure of the alloy multi-layer manganese tour and the blister layer white, surrounded by the transformer, on the one hand, the use of manganese tour alloy high-resistance, high permeability characteristics of magnetic short-circuit, on the other hand caused by the copper layer The eddy currents generate an interference with the magnetic field, magnetic field offset magnetic interference, and therefore greatly reduces the transformer\\ s magnetic field leakage. Under amateur conditions is difficult to obtain manganese the tour alloy cover, but can also be used a magnetic shield made of 1.5 mm soft iron and copper multilayer structure.
3, when the transformer primary impedance is equal to source resistance with the load reflection of the parallel resistance value, low-frequency cut-off, increasing the noise from the transformer, power transformers must have sufficient inductance. But that does not blindly increase the transformer output power of reason. Because the primary inductance of the transformer with the core flux density changes, the secondary load power hour, the core flux density will decrease, so that inductance drop. In general, the power of the power transformer can choose between 1.4-2 times the power of the secondary power supply, be more appropriate.
4, a high quality transformer core permeability magnetostrictive effect is also high on the external magnetic field, pressure, vibration-sensitive, can therefore generate additional voltage, resulting in interference. To this end, assembly or installation of transformers.
To adopt the following measures:
- Core or shield assembly before demagnetization.
- To avoid the short circuit of the core, eddy current, lower flux, so that the inductance drop.
- Transformer should be vacuum impregnated, laminated to each other to move.
- The transformer to be installed in the shock absorber on the base, any magnetic field as sources of shock-mount.
- If installation space allows, acoustic isolation transformer should be.
In the form of the transformer is also very important to reduce interference. In general, the high efficiency of the ring or O-type transformer, magnetic flux leakage flux is easily filled, but not conducive to resist the interference of the grid. EI type, on the contrary, and because there is a certain air gap, make the core of the permeability and stability. Type R is somewhere in between. , China\\ s power grids are more polluting, so many \"fans\" greater choice EI type transformer sound power.
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What is the home audio system which is characterized by how the central
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What is the central home audio system? How its characteristics?
What is the central home audio system:
Home central sound system is a more professional name. Its meaning is achieved through a smart host to the whole house music system. Users can have any space anywhere in the home heard the high-quality, high-fidelity stereo music, and each room can be independent, intelligent, personalized control and operation, such as: free on-demand, source selection, volume control, timer switch time, call mute, and so on.
His main purpose is different according to the needs of those home-loving on-demand personalized music program, and different areas to achieve independence at home on demand, without disturbing each other. This allows you to every corner of the home such as: living room, bedroom, study, dining room, kitchen, bathroom, balcony, roof terrace and other places at any time to listen to music, make music, slow and graceful flow of your day s work to relieve tension and fatigue, independent personality in your family free to enjoy the music space to bring a better life. In addition, a weekend, you can also invite friends and family at home on the concert will be held in Kara OK or party. BYRON one hundred sharp smart host in the hard disk can store vast amounts of MP3, MP4 and VCD (MTV) songs, love to meet different
People of different ages and needs.
Home central sound system features:
1, the central control:
Is central to the smart host as the core source. By the host before the LCD touch screen to control the whole house of music playback. Also can be personalized by the owner in his room control.
2, the regional independent:
Each zone can be independently controlled without disturbing each other.
2, the operational intelligence:
No external sources, without just stay in the living room, without complex operation, the whole house audio system using the controller with a switching terminal, so that music is as simple as turn on the lights. Installed in the room on the LCD touch screen control panel, just a tap, music in the room immediately flowing, elegant and stylish LCD panels also make your living space science and technology have become more promise.
3, built-in large capacity hard disk:
Creative solution to the problem of home stereo audio sources. BYRON not one hundred sharp or insert any need for external audio equipment. Unlike traditional home stereo needs an external CD discs, MP3 discs, U disk and other complicated procedures, and a small number of external music sources, not demand, not fun, can not really enjoy the background music of infinite charm. Built-in large capacity hard drive to solve all these problems.
4, choose Personalize, to free on-demand music:
The embedded design, built-in large capacity hard disk. Hard disk can store vast amounts of MP4, VCD and MP3 programs. Comprehensive family of different people to meet individual music needs. Such as: the home of a child can hear the whole set of fairy tales, songs, English language teaching materials. Once the home of the elderly can listen to the whole opera, drama programs. You do not need these any external devices, all programs can all be stored in the hard disk and can be set in advance on demand. The time to listen directly to the tap room to open the control panel on it. Very convenient, simple and fast. Borrow 一句广告词 \"I point my music.\" Want to hear what hears nothing, it does not Miaozai.
5, four-way radio functions:
With professional-grade high-sensitivity FM tuner, you can also listen to different regions of different FM program. Each region are independent operations.
6, the background music combined with Kara OK function:
Families with 100 sharp while background music is equivalent to have a professional-grade home karaoke OK player. The perfect combination of audio and video technology, so that the family needs of each person s musical preferences can be customized to achieve the significance of the product. TV host can be connected with the smart, hard disk where you can point to sing karaoke OK song or watch other video programs such as: family digital photos, wonderful movies, home videos, etc. Hard disk can be built massive Hominid original singers of the classic MTV music library, matched with high-fidelity stereo sound, home offices can have a K-star treatment.
7, full-function menu display:
All functions and settings are available through 1) front panel LCD touch screen; 2) room LCD control panel display and operation. Song way: the main menu, sub menu, the regional classification of the menu. Song selection methods are: alphabet song, song codes, song by singer name, song categories (pop, classical music, Chinese music, European music, etc.) the name of song by the composer, etc.
plate of the car possible crystal sharp cool modified car magic cube DJ
Fabia Jing Rui since listing with distinctive configuration, a tendency to design highly personalized and cost advantages to meet market
demand, to provide consumers with a variety of options, but also to win more sought after fashion people.
Fabia gives young fashion is the first impression, as a young family, listening to music like most people, but you have not imagined in
the outdoor Party, if your car spinning in the car, that is how Hyun The one thing ah! Young and creative without limits, Fabia Jing Rui
modification of human creativity in the DJ modified car show, will make you filled with wonder, at night this car modified car show car
automatically change from static loading to become hardcore niche music, DJ playing a blast wave disc, interactive units, to show Fabia
Jing Rui young, dynamic, stylish character.
DJ Fabia Jing Rui car to creative modification, red and black color body increased imitation carbon fiber hood, rear spoiler, larger wheels,
the whole surrounded by a large car, excellent texture and refreshing.
Press the “change” button the moment, after the hydraulic automatic door slowly opened under the action of the system, hidden in
the back of the multi-stage sound system Gorgeous However, lights flashing, colorful. Away from the bottom of the tailgate is opened
to mediocre, for as top-down turn, reverse tilt standing.
Side door is not unusual way, by the ordinary method to open out to the sides. Colorful lighting effects to attract the attention of
many passers-by.
Three-dimensional transparent booth, the Fabia Jing Rui cool car show, music and dynamic trend of the neon effect changing the
active site express the stylish atmosphere. DJ spinning, B-BOX, wheelbarrow, etc. show the trend of today s youth are keen to gather
a lot of popular activities on-site. Console link player, amp magic cube, magic cube speakers, a DJ achievements, audio, lighting, mini-
portfolio. Music in the Fabia Jing Rui instantly become a small show mobile games.
Party at any time with the music turned on, all no longer have space constraints. Filled with metallic space, DJ booth rising slowly as if
with magic, in inviting you to become the next DJ, master of the dream stage.
Car MP3 device classification
Car MP3 products a trend for modern product, is currently pursued by many audio enthusiasts, alike. Gradually, remote control models
Car MP3, MP3 electric cars began to replace its traditional MP3. It also is known as audio converters, Car MP3 wireless transmitter or
MP3 car audio companion, and so many, it can be with an ordinary MP3 player, Car MP3 audio system components. Belongs to the
emerging 21st century car audio products, at present, the common variety of equipment like car MP3.
Car MP3 Player can be divided into the following five main
From the power supply on the points: a little smoke detectors with battery type and type Car MP3 Car MP3 (7 batteries or button
batteries).
From the source source: independent car audio interface-type MP3, U Car MP3 disc integrated MP3 player and car.
Car MP3 Player works is very simple, it is the different types of portable music devices such as MP3, CD, MD and other output of the
audio signal to the wireless transmitter to your car FM stereo transmitter way radio equipment, the owners simply set the car radio
frequency Car MP3 frequency, or allow the search to the radio frequency to be played.
Technology should be people-oriented, in many cases, not because of the birth of new products and old products is not good, but a
new product easier to use, MP3 is such a product. From the quality point of view, it is with CD / MD / tape drive has a gap, and so
many traditional Walkman players abhor pain is that it s “digital taste.” But then again, all these years, “digital taste,” the word less and
less in the mouth of Walkman fans, of course, this is not because of technological progress, so that s out of MP3 withdrawal at the
end of the “digital taste “hat, but people have become accustomed to the convenience of MP3 products, for a number of other
minor deficiencies have been less concerned about the.
If you are a “car” like driving your own car must travel at the same time listening to sweet music, blocking roads in the Bay to ease
yourself in the mood. Today s cars, whether in performance, configuration has greatly improved, sound has also been constantly
improved. However, the car music player in addition to FM radio on the way outside, or only the cassette and CD two. When you are
tired of all his songs, whether we still have to purchase new cassette and CD albums too!
The following is to introduce these products Car MP3, Walkman think the past few years: from tape to CD, then MD, now of MP3
products are the result of the transition slowly, and as urban life fashion people, “car” the word has been more and more families to
write the agenda. For people who like music, car stereo also had to build part of the heart, then we can see the car audio
development process, from the FM, tape, CD to MD (our country is relatively small, but the Japanese have been very popular.) Is in by
evolution, then the digital age we are, is not it should look, the next milestone in the car audio – Car MP3 it? What is a car MP3?
Past due in the form of MP3 playback devices, whether it is CD, tape or MD, they are music carrier Car MP3 with separate host, that is,
as long as the host mounted in the car, we put the corresponding disc and cassette can enjoy music. MP3 is different, it s the carrier –
FLASH is integrated within the host in the MP3, we can not host in the car to achieve the installation of car audio MP3.
But it also beat the field of Car MP3 into car audio, a more advanced, more convenient, more efficient way to transport these
products to become a carrier, which is stereo FM. Its main principle is to achieve among MP3 music, the way to radio transmitters,
which transmit to the car FM radio, and through the FM radio, which broadcast the MP3 music.
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.
audio conversion three tips in mind
In the audio conversion, the amplifier, speakers, like the conversion is very important, and audio equipment is installed, the layout of
the sound will have a significant impact. This is like cooking, not only have good material, but also a superb cuisine, excellent aroma
and taste in order to burn the dishes.
Soundproof doors
In the car listening to music and music at home, there is a big difference, that is, fast-moving car in order to achieve good results,
which for a higher sound equipment requirements, and high-speed driving, wind , tire noise and mechanical noise will interfere with
sound system. Hence the need to retrofit vehicles. Generally choose to do the door system shock and noise. Modified in a number of
car door noise shops, car audio shop can do.
Generally use a soft sponge foam to seal the door cavity, the best system of shock with a professional board, but the system board
cost shock is much higher than the foam sponge.
Pay attention to the speaker position
Car audio conversion, the high, medium, have separate bass speaker if installed together will interfere with each other. If an owner of
the Audi A6, Audi A6 modified his sound when loudspeakers installed in the A-pillar on both sides, tenor horn installed in the front door
in the middle front position, while the bass speakers installed in the front door at the bottom. According to the modified technicians
introduced, it is a good alt link between the formation of an accurate sound field positioning. And this modification does not destroy
the original car parts, ready to spin down.
Speaker clever layout
Many owners choose to speakers when converted into hiding, using built-in speakers, so you can save space, is a very practical choice.
You can also choose the irregular shape of the speaker, so you can maximize use of space, and the irregular shape of sound waves
help to eliminate the interference between each other.