Tag Archives: car mid range

How to consider the function of power enlarger

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1.Listen to if the exportation of power enlarger has the static state Zao the voice while having no signal importation after switching on electricity.
2 .The power electric voltage is in the 11-14 Vs whether has stable power exportation.
3.Repeatedly ring whether index sign attains a rules value.
4.The mark calls whether power with physically agree with to match.
5.The oneself anti- interference 1 living how ability is
6.Whether heat elimination is good.The power enlarger would not° until match with loudspeaker mutually also go and mainly consider the power and intelligent degree of loudspeaker.
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Improve bass inside the car to surround an effect method

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Main music inside the car feels to come from anterior loudspeaker, so if want to strengthen sound effect, can replace anterior loudspeaker.In the process of refitting in, must notice the matching of of each parts of stereo set.If
Host and power enlargers all belong to low medium carry a product, change a loudspeaker of high level can not reach its effect is either.
Car Amplifier

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The car stereo set listens to the sound having a key

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car woofer – China Manufacturer
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The good stereo set makes you place oneself music hall to put a recording with sturdy low frequency, like big drum, the bass BASS , the bass flexible number, bass list Huang tube, diagram Ba Hao, French horn etc., add the volume to enough and greatly, then gradually decrease, under the circumstance of any volume, can hear clean, deep and low, loose permit appropriate low frequency is high-quality tone color.In addition, the good stereo set has the voice field of panorama type to reappear ability, while listenning ability music at you front of a big slice of district reappear, not from list the loudspeaker unit sent out and let people had the felling to place oneself music hall.Superior quality of tone color\\ s still including in the whole car compartment can hear the voice of balance reality, for example broadcasting one can obviously classify an or so track recording, superior quality of the sound quality is to try to listen to an or so track can hear respectively two tracks send out of all voices, and can hear the car stereo set of balanced consistent music original package facilities not necessarily good on the different seat.Refitting car stereo set system is the vogue that the modern plays car one clan.However, in the aspects of refitting a car stereo set, many people exist many understanding mistake area.According to understand, the regardless importing or domestic sedan is also regardless medium file or upscale car, the stereo set system of its original package how much all have some to make people disappoint.Because the car is after all a car, not multi-media computer or home appliances, cool love stereo set of friend\\ s only passing to refit just can satisfy a his/her own sense of hearing high standard request.The many people thinks the stereo set facilities on original package of car must be good stereo set facilities, this is one of the mistake areas.This personage says that usually car host and trumpet of original package compare a wanting of stereo set fancier imagination to differ a great deal, is that the even if upscale car is no exception.Especially a lot of car stereo sets are in installing bass the existence lack and and is hard to attain high fidelity request.Moreover, car owner at refit a stereo set of, usually feeling should adopt host, trumpet and other accessorieses all a series fix menu in restaurant that company produces, this is again a mistake area.Because truely produce the company of professional car stereo set device among nations, isn\\ t the profession been known for because of the series fix menu in restaurant of its production, but exactly been it very strong some one device but drive industry approbation.For example:Japan produces of host, manipulating of its electronics figures science and technology and sensitive convenience function takes up the running a nation, but the trumpet of Euro-American production, it superior quality of the fine foundry technique of material and pure quality and traditional handicraft again that day originally produce a company to compare.So before the car stereo set refits, want to choose a good adoption first which companies the professional device of production, all materials choosing isn\\ t a good choice from a product of company.
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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.

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Car Audio Speaker amplifier integrated non-destructive upgrade

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Many car owners looking forward to have a high quality car audio, can be a lot of people do not want the converted audio and any changes to the car interior, so caught in the dilemma. However, a new speaker-24/">car audio speakers and amplifier into one that will help riders solve this problem. The so-called speaker amplifier integration of sound set of speakers built-in amplifier and HOD sense of hearing technology in a new product, simply each speaker audio characteristics of the vehicle environment, specifically supporting a human ear, car ideal to listen to the sense of the effect of output characteristics of the product. The characteristics of this product under the premise of ensuring the sound quality upgrade, the original car stereo without damage upgrade. Damage upgrade in the modified car audio, automotive sheet metal structures and the car interior without any damage and changes, upgraded sound system on the original car electronic devices functionality and electricity system does not cause any interference and conflicts to to ensure traffic safety, In addition, an upgraded audio system, power must be adapted to the energy reserves of the original car, to avoid the vehicle power supply system to work overload, leading to shortened life expectancy of the battery or generator. There may be riders have doubts about the sound of this new type of audio equipment, to this end Mahone to find an Accord car equipped with the audio device to personally experience. The first is to install in the car did not see any traces of the changes to the interior, line, etc. audition the sound, the sound clear and sweet, clean sound and thorough, no difference in feelings with the family HiFi sound. However, the reporter seems, there are two things wrong, such as the bass, feel the impact and shocking less than a reporter\\ s request, in addition to its subwoofer is installed in the trunk of the vehicle, due to the larger, so more space However, fish and can not have both, the most expensive of the sound is not a few thousand dollars, its unique features and a higher price, is definitely worth some of the riders to consider.

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new cars to change audio – car should be fine to distinguish specific

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car tweeter – China Manufacturer
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  Audio and video conversion professionals have pointed out, in fact, choose \"car only\" should also be careful to distinguish, in order to find the best car audio upgrade program.

Be careful, \"avoid disassembly\" fabled

   To mention the end of the car, some car owners not satisfied with the original car stereo, so, wanted in the past years of the original car audio and video equipment some upgrades. In order to meet market demand, some modified shop also launched a \"free disassembly\" of the modified new program, such as disassembly to provide some free car DVD products, the conversion process for owners fear will destroy the original car design problem, achieve a \"free disassembly\" to secure modification of the effect. Sound, it seems very attractive, but demand has modified cautious owners.

   All along, the car stereo, CD conversion is to \"remove modified\" approach, that is to be the basis of the original design of the car up re-wiring, design, interior changes. As car manufacturers in the production of vehicles, based on cost, fuel consumption, price, and many other considerations, combined with safe driving data such as speed, speed and other factors, so in many parts of the design layout has a fixed program, and \" demolition modified \"in the process will undoubtedly affect these original designs, often have two problems: First, the conversion process to give the\" destructive \", due to the re-design, bound to have a car the original lines, interior, cause some flawed parts; There is also modified \"adaptive\", modified car parts as reasons for change, or there may be similar to the normal operation of the power mismatches, circuit overloading and other adverse reactions, thereby affecting traffic security.

   Sounds like \"free disassembly\" seems a lot of advantages, but in actual operation, but there is a big limitation, which also makes a lot of converted stores in the conversion process is still difficult to avoid disassembly. Sounds Square, audio and video conversion studio head Ningwen Jiang said that the free disassembly and installation of sound is not demolished, but in the actual conversion process, a vehicle is definitely needed to install some equipment like dismantling some of the panel, there is no full sense of the free disassembly, disassembly of degree only. Modified by individual stores for \"free disassembly\" slogan took the opportunity to put forward a higher conversion costs, vehicle owners should be careful not to be misled by their one concept, otherwise, the same conversion process is more Spent time and money.

Special car only for the host part of the

   There are car owners think that the current special car modified car audio equipment, including hosts, speakers, amplifiers and other equipment fully. But in fact, the current car-specific audio-visual equipment, only for the host part of the terms. Professional car audio shop can be modified according to the needs of owners, the installation consistent with the style of the original car DVD navigation and dedicated panel, but the amplifier and the sound can only be another purchase.

   Among the many suitable for conversion of DVD navigation products, as more emphasis on the design of domestic brands, especially the brand of panel models, has reached great accuracy with the original car-style effects, but unfortunately the picture, sound quality has been no implementation a breakthrough. The import of the host is still focused on the actual quality, but in terms of appearance, for most non-market selling car models are still unable to provide specific products.

  Therefore, the owners are two camps in the choice of this product, from its own budget and the effect of the modification to measure, for their respective advantages and disadvantages to the appropriate purchase.

Consumer tips: professional car audio shop should choose modified

   Owners of large-scale modification proposed modification to select those stores, especially those who can provide various models of car modification shop dedicated host. Currently the local car audio shop although more and more, but some only comprehensive management, audio and video is part of, usually made car brand car owners dedicated host, they can not provide cash, basically temporary transfer goods from other sources over , but also for those non-market selling cars even more powerless.

   Car-specific products need to complete the variety of course, but modification process is the strength of the test conversion shop. Some of the host part of the original car modification shop removed, the replacement of the original car for a dedicated host, but the details related to the electrical installation, once the operation is unskilled, easily a security risk for the original car.

   Prices, we all know, to mention a new car, if convenience stores to install directly to 4S, generally the same grade of product, more expensive than the market more than 50%. Now that a wide variety of products, the market is extremely competitive, the price of many brand-name products have been significantly reduced, the general price 3000-4000 yuan selection of products, you can reach better results.

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want to buy a home theater will not be deceived – must see

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At present, the home theater market starting to prove popular, how to choose, to suit your taste with a home theater has become a concern to many people. However, some traders to \"home theater\" as the words of their \"Midas touch\" spell, use it to sell counterfeit goods. Some consumers do not have the relevant knowledge, in the \"home theater\" under the gold standard, pocket buy a bunch of \"electronic garbage\", only to get some name
The \"enjoyment\" and \"fashionable\" and enjoy the only commodity on the labeling and advertising of the \"modernization\", the legitimate rights and interests have been compromised. In this \"background\", the manufacturers of seven-channel, 8-channel \"home theater processor\" is also not surprising; not to mention the \"plus horn carpenter, electrician when the total work,\" the process produced a \"family theater speaker \"of the.

In the current home theater market, not all manufacturers and traders expect the self-discipline, rational consumers in the purchase to be cautious, in particular, need to pay attention to some \"deceive\" the trick:

A: Dolby Digital, DTS readily available

If you just look at some of the media, advertising, distribution of advertising or listen to some of the manufacturers promoters, introduction to business sales, many consumers may think that a \"Dolby Digital AC-3, DTS\" and other advanced features of home theater products have been to the door, can easily have it, the price is only 1,000 yuan, or even lower.

In fact, just from the hardware is concerned, with a minimum to have \"AC-3, DTS\" functional home theater (sound general) have more than 5000 yuan. If someone thinks that only 1000 yuan will be able to solve the problem, only two possibilities: either he\\ s currency is the U.S. dollar; or he is a lie. That only the original 2-way (stereo) output power amplifier and then into a 4-way intentional (fake Pro-logic) or 5 (fake AC-3), and even more output. Put a CD or VCD (2 way surround sound) a try, and the brightest speakers in the ring. Consumers do not understand that this amp is good. Then, the business will be \"warm\" to introduce you to fish in troubled waters on the amplifier panel \"Double B\" or \"double horn\" logo (really should be \"double D\"), and show you the small print instructions on the use of vague claims There are \"AC-3\", \"DTS\" feature (this feature truly should be obvious to use the font in the main position statement: license from Dolby Laboratories).

Indeed, the real home theater amplifier to put a CD with only the left and right main channel speaker ring, center and left and right surround speakers are not sound, because the CD is only two channel stereo, not 4 or 5 independent signals. More ridiculous is that some of the \"mattress factory\" production of VCD machines are also labeled \"DTS\" logo, and DTS technology and VCD is no detached. So, truly \"AC-3, DTS\" and other advanced features of home theater, the distance from the consumer a little farther than imagined.

Two: buy the more discount the more

Such as a brand of DVD players, according to the normal retail price is 1200 yuan / Taiwan, the purchase price of 1,100 yuan / Taiwan. But if you ask the price, the price out of the business is different: 1200 yuan, 1150 yuan, 1100 yuan, 1050 yuan, 1,000 yuan have. After shop around, if you think that businesses in the asking price of 1,000 yuan to buy the most affordable home theater, you\\ re wrong.

The purpose is to open low-cost business make you think, he sold the merchandise is \"the cheapest on the market.\" When you have been fooled by his low, he will be vicious knife to kill you. When you only buy DVD players, the business will immediately say: \"Stand-alone does not sell, unless something else to buy, such as speakers, amplifiers, microphones and so on.\" To know that some of the purchase price is only 30 yuan / only the microphone, to meet the general household use, for 260-300 dollars per merchant to sell you. If you buy a pair of microphones, that $ 200 price difference is not only leveled the discs, but also may be lucrative. Moreover, many people not only buy a player and a pair of microphones, but including speakers, amplifiers, surround, etc. full \"theater.\" In addition, many consumers have found \"the more buy more discount\" and \"Law\", regardless of whether a reasonable mix of equipment, but also put together a complete home theater within the business to buy. Businesses can not see you not buy, they will ask you later on the price of equipment, throwing a high price for sale. So, some players are smart to buy a piece, which spotted the pieces which pieces to buy, so that businesses no loopholes.

Three: no-name speakers charge fine

Speaking of speakers, that\\ s what the most profitable businesses. Many businesses love business \"foreign\" brand speakers, and a considerable part are of no-name. High profit margins because of brand-name speakers. The average consumer\\ s listening level is generally not high, the lack of sound ability to identify the pros and cons. Buy speakers look pretty enough, tall enough size, speaker enough, sounded loud enough to shock, luxurious enough to put in the hall on the line.

Audition, the merchants love to use some of the disco, rock and electronic music, or use some of the so-called \"test Yindie Emperor\" Play some reason sound pressure of the aircraft taking off and landing, rocket into space, hit the glass, lightning, etc. to listen to not really sound good or bad the noise you hear, and to open a large volume, high and low tones large, such as loudness switch is pressed, then you really hear the voice strong enough enough to shock. Businesses also lost no time in your ear, said: \"Look, low-frequency strong enough to it, more metallic sound crisp treble!\" Business that the exaggeration of low turbidity strong enough to tip too harsh on the treble treble said to have to go. In fact, these are serious distortion of the noise, how can the beauty in the world? Most of these unqualified no-name speakers played \"imported\" on the cover, but in fact does not stand the scrutiny of experts. Last year, an English-speaking consumers to buy a set of \"imported\" speakers, and found that only 300 or so words of English instruction manual, there are 25 misspelled words, and apparently he bought a set of fake.

Four: foreign goods in respect of your

Currently, in cities across the country, the foreign flavor of the \"import sound\" stores have been common. Most of these stores ornate decoration, and some also have a dedicated listening room. In these stores, four posters, \"the United States, Denmark, Germany, Britain\" and \"imported\" speakers of promotional materials, and some have even posted a sharp color photo of the British royal family. Inspection certificate, undertaking, \"imported\" speakers warranty card, full of passion to communication information, etc. everywhere. There are also full of modern promoters of the lobbying, all of which will enter the consumer that the sale of the speakers here for the imported goods. In the shop, put the \"imported\" speakers gorgeous coat, value is naturally soared, the price can not be made in China to make similar comparisons. But in these stores, often embarrassing things happen, that is, when consumers are asked to the sale of \"imported\" speakers alone without customs duties and certificate of origin, the business often hesitated evasive not a direct answer. Some consumers even said: \"There is no single customs duties and certificate of origin is not important, knockoff is genuine goods.\" What is more, holding publicity to disseminate information to consumers: This is an import certificate.

In recent years, speakers and selling fake goods on the market has a new way, some of the so-called neither in domestic production sites, but no production equipment, office and only a few people, then one or more registered abroad \"foreign\" brand, commissioned a number of domestic companies to the OEM. Be pointed out that: This \"foreign\" brand did not go through the international market competition, is designed for registration and the production of the domestic market, many of them have \"cottage industries\" and \"mattress factory\" of the product, not the fundamental guarantee for the product of quality. However, these \"foreign\" brand speaker is engaged in the sale of authorized sales and store sales, so there are some deceptive.

Five: the heavier the weight the better the amplifier

In general, the greater the output power amplifier, the greater its power transformer, then the weight will also increase the cost of course, also high. Therefore, in the home theater market joke to say is: Amplifier prices to sell on the pounds. Some unscrupulous vendors will use this understanding of people deliberately engaging in sham. As in the production of PA, in the machine by adding a large lead ingots. In order to enable consumers to easily find this piece of lead ingots, and with rivets instead of screws amplifier cover riveting die, so that ordinary consumers do not split open, and thus can not be found in heaven and earth. In addition, in order to deceive consumers, but also in the instruction manual of the amplifier\\ s output power and weight machines bluff, and repeatedly \"reminded\" the consumer, do not open the lid to avoid \"dangerous.\" This manual is actually the book is a downright lie.

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the characteristics of car audio and car listening environment

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line array speaker box – China Manufacturer
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car audio Knowledge entry – Features – Category articles: detailed description of the characteristics of car audio and automotive listening environment knowledge. The following order by the purchase shopping network, available to you for reference.

The characteristics of car audio and car listening environment

First, the characteristics of car audio

Car audio and home audio functions basically the same expensive than home audio, car audio than it is because the more unique home audio.

1) small form factor.

By the vehicle dashboard area restrictions, car audio smaller. In a limited volume, car audio technology to achieve the design requirements, the cost will be high.

2) and appalling conditions.

Different levels of car driving on the road, the car stereo will be subject to vibration and shock, so the car to use more tape playback part of the lateral placement of the upper and lower clamping to ensure stable playback. CD part of the multi-stage damping measures, the CD in advance of the release of the information stored in the chip 3s, CD player by a strong vibration, the laser head should be protected to stop working, then release the information stored in the chip, so do not feel playback stutter or skips. Car audio components in the welding assembly to be absolutely solid, the individual components need to use more powerful limbs fixed. Car audio to be able to withstand the outdoor temperature changes (under the dashboard in the sun the temperature can reach 70-80 ℃, cold regions of up to minus 30-40 ℃), so the level of components required is high. Car audio for the prevention of moisture should have a certain measure, generally in the component surface coating agents moisture protection circuit, so that the lower part of car audio in different environments to work properly.

3) the use of low-voltage DC power supply.

Large passenger cars, trucks and more car audio power supply system for the 24V, 12V passenger cars use more power, voltage change will directly affect the audio output power. Power amplifier using switching power supply voltage to the step-up method 35-40V, the voltage fluctuations can guarantee the stability of output power. Car audio amplifier with high current linearity, saturation hold the line, high efficiency, and has overheated, over-current, short circuit protection. .

4) anti-interference ability.

Automotive engine ignition system and a variety of electrical appliances and car stereo with a common battery, it will through the power lines and other lines of audio interference. Of power line interference, can choke the string in the filter between the power and sound; of spatial radiation interference, can be sealed using metal shield isolation. In the high-end audio is also equipped with a special integrated circuits and components for anti-interference, to reduce the external noise.

5) The radio part of the high sensitivity.

Car on the road, both the external environment have changed the direction of impact (such as tall buildings, bridges, cable networks, etc.), to ensure the normal radio, the radio part of the required sensitivity, selectivity, S / N (signal / noise) ratio are high performance, the AGC (automatic gain control) and AFC (Automatic Frequency Control) requirements are high. Mechanical radio tuner and more sense to use tone mode, vibration and tuned to enhance the stability of the FM (frequency modulation) band of the coordination requirements of stable and reliable. Advanced use of digital sound synthesis has been coordinator.

In addition, there are many car audio home audio features are not available, such as: operating instructions with voice control of audio, hands-free control just talking to complete the operation; steering wheel audio controls mounted on the status of various work button, you can also hand steering wheel audio controls; advanced audio capabilities in the voice prompts (VOICEGUIDE) and so on. Some of the speed of sound pressure according to the speed of human eardrum pressure changes generated automatically increase or decrease the volume potential, so that passengers do not feel the volume change. Wind and engine noise makes it difficult to capture the details of music, in order to overcome this problem using dynamic road noise control, dynamic road noise control (DRC) can enhance the bass and treble, but also increase the soft music section.

Second, the car listening environment

As the car s own characteristics, vehicle listening environment with the following results on the listening adverse effects:

1) car interior volume of only a few one-tenth of the general room, and car interior with obstacles of various shapes, sounds are not well spread, will result in a hearing on the oppressive.

2) General room or concert hall reverberation time-bit 300-1000ms, and the car interior of the reverberation time in 100ms or less, very short, resulting in lack of reverb, presence at the hearing is not easy to generate a long time will produce fatigue.

3) The home stereo system to listen to the speaker s position relative to the symmetrical position, and location of car audio system for listening to the speaker s position is very asymmetric, rising tone in the auditory field will tend to listen to those close to the speaker position direction.

4) a variety of materials for sound absorption is different, and the same material for each frequency absorption are different, so even if the same types of vehicles, materials and decorations will be due to internal differences in the number of sound effects .

General interior decoration, car seat, roof and floor surface materials such as cloth and blankets, the inside of the use of synthetic leather, with listening and glass effects, in the middle and the formation of more complex high-frequency acoustic characteristics. Leather interior decoration of the absorption of sound is smaller than the cloth, therefore, the use of leather upholstery of cars, in the hearing, the high-frequency listening was better.

5) car-specific noise, such as traffic noise and vibration, engine noise, tire noise traveling, listening for the sound effects will have a negative impact, particularly on the impact of low-frequency range, thereby undermining the sense of the intensity of sound and music. As the speed increases, the noise gradually to the high frequency part of the expansion will cover the low-frequency noise driving the sound field, so the sound quality deterioration. Car audio by car driving noise is very large, usually can feel the phenomenon: when the car is moving low-frequency domain than in the stopped state appears inadequate, as the speed increases, the frequency will become deficient.

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subwoofer sweep aside the myth of the five modified

Spread in the car audio industry myth about the subwoofer sound a lot, and some really bizarre sounds extreme, the following will

introduce several alert readers to look at:

1. “Rushed and you want music that sounds interesting, installation subwoofer on the right”: This argument does not pay attention

for the quality, accuracy of sound field, but only the pursuit of sound pressure to stimulate the people who really feasible, because

you As long as the low-pass subwoofer crossover point and subwoofer work pulled to the frequency domain overlap, a substantial

increase in the amount of bass you can feel. However, this greatly inflated the bass is definitely not the right voice, it sounds

absolutely will not only momentum but nice.

2. “Subspeaker-25/”>woofer speaker hole size consistency as long as any subwoofer can be installed”: each of the mechanical characteristics of the

subwoofer is not the same, assuming that the proposed speakers on a speaker volume is 20 liters, another is 40 liters, the results of

these two speakers are installed in the same style of the speaker, the sound effect you think they will be the same? Real professional

practice, or have to use the original test data sets of speakers formula, tailored to match the volume of the speakers, the subwoofer

to get the best results.

3. “Two different brands, models installed on the same subwoofer speaker can also use”: I do not know this because the stock

speakers or stereo shop for other design considerations only occur, basically as long as the different brand, model subwoofer, its

mechanical properties are different, so if a speaker fast movement, the other a horn like a slow and in the jump, so the subwoofer

does not like the introduction of a ghost fighting as hard to hear pole? Thus, two different brands and models of speakers installed on

the same speakers, the vast majority of cases are not feasible design.

4. “Because the subwoofer installed in the car trunk, so the sound is coming from the back”: If you encounter a car audio shop boss

told you so, you can ask him: Why not put on a home stereo shop sounds do not sound like from behind? Basically, as long as the

subwoofer system is installed properly, phase, crossover, proper adjustment of the amount of sense, you hear the low sound field in

front of the foot should be in the driver s seat position, and with the bass to get a good convergence.

5. “Convertible two-seater sports car subwoofer system installation location is in the luggage compartment”: We all know the general

car install subwoofer system is the ideal location after the luggage compartment, but if you encounter such as Mercedes-Benz SLK

two-seat convertible cars, and even Porsche, Ferrari, so we have to change the rear-engine sports car subwoofer, that method may

not Siban Ban mounted subwoofer to forcibly stuffed into the trunk slightly! Imagine the car s luggage compartment and passenger

compartment has a thick layer of sheet metal between the separate subwoofer mounted in the luggage compartment, how could

pass into the passenger Boeing matter. So experience this car subwoofer system to convert the special case of the method is still to

be a special shape of the speaker, deputy seat installed in front of the pedal position is!

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Structure and function of the audio amplifier

No matter which type of car audio power amplifier (hereinafter referred to as PA), which are composed of two parts, the power

supply and audio section, as shown. The first part of the vehicle power supply filtering, and then by the step-up transformer to

enhance the audio portion of the supply voltage to drive the speakers. Voltage step-up transformer to raise the requirements to

increase the supply current, voltage, the greater the greater the required current.
The audio amplifier section is to be low-level RCA jack input host low-level signals, or high level speaker input signal by the pre-

processing, to after-class power amplifier, power amplifier output to the output part. In the audio portion, but also signal processing

part is divided into pre-and post-class power amplifier part. Pre-signal processing part is when the input signal filtering (high pass, low

pass), adjust the level (volume control), as well as to enhance the low-frequency gain (usually in two-channel or single channel can

amplifiers have this feature ) part. Part of the power amplifier output, but also by the positive and negative signals to drive the

speaker is divided into two parts, two parts by two amplifier tube amplifier to drive, so the post-stage amplifier in the power of the

tube parts are used, respectively, to positive and negative part of the amplified signal. Class A power amplifier, AB etc. is by processing

the signal to distinguish between positive and negative parts of the state.

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