Audio harmonic distortion (TMD%)

There are a variety of speaker distortion, a common harmonic distortion (caused by the multi-speaker distortion field inhomogeneity and vibration system, often produced at low frequencies),Multimedia Speaker intermodulation distortion (due to the two signals of different frequencies while adding speakers, sound quality deterioration caused by mutual modulation) and transient distortion (due to the inertia of the vibration system can not keep up with changes in the signal changes, causing signal distortion) and so on. Multimedia Speaker When harmonic distortion is reproduced in harmonic components of the original signal not. Harmonic distortion of the speaker from the uniform magnetic field, the characteristics of the diaphragm, displacement of the coil of nonlinear distortion. Currently, the preferred harmonic distortion index of not more than 5% of speakers.

How to repair a Car Speaker

Speaker does not ring or hoarseness mainly due to lack of power with battery save , horn relay and buttons damaged, bookshelf computer speaker to the speaker and so on. Follows :

1, check the horn chirp , if the song does not feel crisp , low and weak , mostly poor contact .

2 , repeatedly pressing the horn switch , if the horn sounds sometimes , sometimes not ringing, press contacts , mostly bad contact switch inside .

3 , turn the steering wheel left and right , if there is a large " hissing" sound of friction , you can contact the relevant Multimedia Speaker of the injection of some grease.

4, if the speaker does not sound completely , it may be a fuse is blown , you should check the relevant fuse . It may be a problem with the speaker 's power cord . Find the speaker 's power cord , plug the detachable power cord wiring a check for poor contact .

5, if the horn chirp boring, there is likely to be the speaker 's own fault , then just knocked speakers, most of them can be improved. Mostly due to poor contact plugs , especially various contacts around the steering wheel , because frequent use , easy to make contacts to wear.

6 , Mifengbuyan easy to damp , although the internal speaker is closed, but if Mifengbuyan wash the interior space into a mist or water vapor in the air , moisture vapor can easily lead to contacts does not work .

7 , the work of the speaker in the car low , and the work on the battery , if the battery 's energy is reduced , then the sound of the horn is also reduced , to check the battery charge capacity is normal.

The speaker must be good at use all kinds of methods of expression

The speaker must be good at use all kinds of Multimedia Speaker of expression. The speaker to the audience to understand his own ideas, with their own emotional resonance, this means in addition to the use of language, but also is good at using various means of expression. There are three kinds of expression: facial expression, posture expression and verbal expression. These three expression plays a very important role in interpersonal communication. From facial expression for, should be accord with natural and abound change, a smile, the same conditions, and the content of the speech and, pay particular attention to play to the role of the eyes, do use eyes to speak. From the posture expression, main should be able to match the content of the speech use all kinds of gestures, it'll be the first to explore the effects of all kinds of hand gestures. In general, natural and smooth bookshelf computer speaker can help the speaker calmly, sharp, powerful gestures can help the speaker's heart sublimation, safe and subtle gestures can help the speaker shows palpitations. Verbal expression is mainly refers to the tone of the high and low speed, speed, sound is the medium of the speaker and the audience, the speaker must be good at combining the content and the reaction of the audience, let feelings decided to voice change ups and downs, achieve the goal of "to love" and tightly attracted the attention of the audience.

The rated impedance (Ω)

Impedance is refers to the vehicle speakers the ratio of the input signal of voltage and current, the units of ohms (Ω). Popular said impedance is car speakers to present the current resistance and bookshelf computer speaker is not equal to the resistance, but including resistance and reactance, which include the resistance and inductance and capacitance impedance and capacitive reactance of three parts, is the sum of the three on the vector.
Under the same voltage, impedance is smaller, the higher the current impedance is lower, the greater the current. In power amplifier and Multimedia Speaker power of the same circumstances, low impedance car speakers can obtain larger output power, but impedance is too low and can lead to owe the phenomenon such as damping and bass degradation. In general, the lower the car speaker impedance, and the more difficult to drive. Impedance is not a constant value, but by the frequency on the music and the changing of play, may be in a high frequency to more than a dozen ohms or 20 ohms, may also be at a low frequency to a ohm or below, generally at its resonant frequency between the formant of minimum impedance value as its nominal value. At present, most of the car speaker impedance is 2-8 ohms. Speaker impedance optimization value of national standard in our country there are 4 Ω, 8 Ω, 16 Ω (international standard recommended value for 8 Ω).

The types of sound

The sort of sound is extremely complex, the points from the small to the size of the Multimedia Speaker devices, to hundreds of watts on fever kilowatts of professional audio equipment; According to the types of points and can be divided into separate one-piece audio and power amplifier, stereo type combined sound; According to the type of power amplifier, speakers can be divided into the transistor amplifiers, vacuum tube amplifiers, speakers and can be divided into cone basin unit according to the unit of pronunciation, plate unit, ball units, belt type, such as acoustic structure according to the body and can be divided into closed box, inverter, box, passive radiator speakers, transmission line speakers. Speaking of mini audio, a lot of people actually doesn't have a clear concept, this kind of products based on the combination of sound and personal bookshelf computer speaker should play what role? In fact, is the main purpose of mini audio improve the acoustic environment of a single room, no matter the rest was doing the housework can build a good atmosphere. Many men like to get up in the morning to hear the news, women like makeup while enjoying the music; Family cook dinner together after I come home from work or reading books and newspapers also like to do to adjust some of the music. This time is the time for small mini audio show avatar. Because of its simple structure, mini audio in addition to the power supply without too many wires, not only can be moved around, and will not interfere with the home decoration, and most of the mini audio with radio, music playback, DVD, VCD discs, and even the MD and a variety of functions such as external audio source so the bedroom, the kitchen has a mini audio is sufficient to support a delicate sound field.

Traditional loudspeaker consisting of speakers

Directivity is very good. General use of traditional horn speaker, directivity is very poor, you must be standing in front of the speakers, can hear the sound of the relatively perfect, especially Multimedia Speaker high; And if you stand in the side of the speaker, or there may be some background accompaniment sound won't listen to it; If you stand in the bookshelf computer speaker of the speaker, may the sweet songs, have become reluctant to appreciate. And the plate type sound box is not the problem, no matter where you stand in any position, can enjoy to the full, true voice; The sound attenuation is small. The traditional speakers, when too close you will find that your voice is very big, the distance is farther, you think voice is a lot smaller. And plate type sound box is not the above question, whether you are at close range or slightly distant, hear the voice of the size is not much difference. The high fidelity of sound. Conventional loudspeakers, its shape for sound cone, when vibration noise, often will sound in the throat, compressed, and then spread out, and people hear voices, is compressed and the voice of the deformation. Plate type horn will not have these problems, because people only hear too much distortion, so once in contact with the plate type sound, when they began to listen to don't think it is very ordinary, then often are attracted to the performance of it naturally.

The speaker must ensure that the definition of the language

As speech when using, must ensure that the definition of the language, if people can't hear the speaker of the language, can Multimedia Speaker the effect of the speech. Therefore, in the acoustic system design should give full consideration to improve the language articulation: when enough fullness. With good fullness performance effect, can make human full, rich, the music rising and active. In the acoustic system, only through the use of peripheral audio bookshelf computer speaker of the voice signal effectively and reasonably select speakers of these measures, the fullness of sound was able to meet the requirements. Acoustic characteristics amplification system of computer aided design is the use of modern technology is engaged in the engineering design of a kind of ideal method, high accuracy, high efficiency, more important is do not need to wait until the end of the installation can know engineering design results. Acoustic characteristics of computer design system has very good credibility and precision, in the entry hall built sound data accurate enough, the calculation data compared with the last acoustic measurements, error can be controlled within the db. For engineering design and installation and debugging, this is enough, at the same time it also has the very good design installation guide, the in the engineering design of the past to get a good verification. Acoustic CAD computer system is used to design halls, gymnasium (field), multi-function hall, hall acoustic characteristics of the sound reinforcement system, means, do not need to wait until the system after the installation, debugging, and measuring, can know the design and installation debugging result. According to this design scheme is given, in other words, the audio system and the design and calculation results, has clearly see the expected amplification system acoustic properties.