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    News classification:Common problem   author:handler    Published in:2018-12-244    Written words:【large】【in】【small

    Speakers in automotive sound system are used as a restoring device to restore sound. The quality of sound is directly expressed by speakers. That is to say, the whole system is more complex. Finally, we hear the sound of speakers. Let's talk about speakers.

    (1) Characteristics of vehicle loudspeakers

    Some friends will say that car stereos are the same as home stereos, but what's the difference?

    1, temperature

    Household acoustics are used in bureau rooms, so the temperature difference is small, while car acoustics are used outdoors. With climate change, there is no temperature difference, so it is necessary to resist temperature and aging.

    2. Humidity

    Cars take watery sections when it rains and are attacked by dampness when they wash their cars. Therefore, they need to be shockproof. Now, they often use synthetic sound basins which are moistureproof-proof.

    3. Dust

    Household acoustics are used indoors with less dust and more dust in the car. Dust shield is needed to prevent friction and noise from the voice coil.

    4. Vibration

    Vehicle loudspeakers are impacted by the oscillation of vehicle motion at any time and anywhere, so they should be designed firmly and not be loosened.

    5. Noise

    Considering all kinds of noise and oscillation, the materials used are different, and different methods should be used to cancel out different noises.

    6, impedance

    In order to obtain more power, the impedance of loudspeakers is smaller, and they mostly use 4 Euros, 3.2 Euros and 2 Euros.

    (2) Automotive loudspeaker structure

    Folding ring

    Folding ring, also known as leather edge. Its function is to provide a certain degree of smoothness for the movement of the cone basin (2), that is, a certain degree of flexibility, so that the cone basin can move forward and backward. In addition, there are auxiliary centering brackets (4) to locate the cone basin voice coil, to keep the voice coil in the center of the gap, and to provide the function of the restoring force of the cone basin motion.

    Two. Cone Basin

    Cone basin, also known as diaphragm, is one of the most important vibration components in loudspeaker unit. It directly drives air and converts the mechanical motion of unit into sound wave transmission motion of air. Cone basin directly determines the performance of every aspect of unit replay sound, such as frequency response, distortion, and even sensitivity. Among them, the size, geometry, material properties, mass (weight) and other characteristics of the cone basin are important.

    3. Dust-proof cover

    Dust shield? It's just a cover. What can I say? Yes, the cap is its primary function to prevent foreign objects from falling into the gap and affecting the movement of the voice coil. As a cover, it also has the same function as a folding ring, that is, to isolate the air in front and behind the cone basin, so as to avoid the sound radiated backward around the front, resulting in sound short circuit.

    IV. Centering Branch

    Centering bracket, also known as bullet wave. Its main function is to provide restoring force for the movement of the cone basin, and to keep the voice coil in the correct position in the magnetic gap while moving. In addition, it can prevent foreign bodies from falling into the magnetic gap. Although rarely noticed, in high fidelity bass units, the performance of the centering branch has a very important impact on the replay of the unit bass.

    Five. The frame.

    The pelvic frame is the framework of the whole trumpet unit, and most of the components are directly or indirectly fixed on the pelvic frame. But its effect on sound is relatively small. The basin rack is mainly made of iron, cast aluminium or plastic. Everyone likes cast aluminium basin racks because they look and feel good. Of course, the cost of iron and plastic basin racks is much lower.

    Six, voice coil

    The voice coil is the central part of the speaker unit. The speaker completes the conversion from electrical energy to mechanical energy, which is carried out by the voice coil.

    7. Upper splint

    The upper splint is also called the front splint, Wallace and so on. The magnetic conductive plate column, also known as T-iron, can be divided into two parts: the lower (rear) splint (which is called the magnetic conductive plate with the upper splint) and the magnetic conductive column. Together with magnets, they form the magnetic circuit system of the unit.

    Eight. Magnet

    Magnets used electromagnets, or excitation circuits, in the early stages of the development of loudspeaker units, and are now almost entirely replaced by permanent magnets (except for a few enthusiasts who play by themselves). There are three main types of magnets in horn unit: ferrite, Nd-Fe-B and Al-Ni-Co. Aluminum-Ni-Co has good characteristics, but its price is too high, so it is seldom used now. Ferrite is low cost, stable and most used. NdFeB has a high magnetic energy accumulation and is widely used, but its Curie point is low, that is, it is not heat-resistant. Recently, the price of rare earth has soared, which has also affected the horn magnet market.

    9. Voice Circle Skeleton

    The commonly used materials of voice coil skeleton can be divided into metal and non-metal. The main non-metallic materials are paper, polyimide, mica reinforced resin, etc. Aluminum and brass are commonly used in metal materials, of which aluminum alloy is the most commonly used voice coil skeleton material for high-power units.

    X. MAGNETIC CONDUCTING PLATE AND COLUMN

    The permeable plate and the permeable column are generally made of low carbon steel or pure iron, requiring high permeability.

    11. Stomata

    This structure is a channel through the center of T-iron and does not exist in all the elements. Many units do not have such a structure.

    (3) Classification of loudspeakers

    1. The frequency of the loudspeaker is

    (1) Full-frequency loudspeaker: able to reproduce full-frequency sound (20Hz~22KHz).

    (2) High-pitch loudspeaker: also known as high-pitch head, high-pitch boy, mainly replays the high-frequency part of the sound of 6-22KHz.

    (3) Median speaker: can reproduce 200 Hz ~ 6KHz.

    (4) Bass speaker: also known as heavy bass or overweight bass speaker. (16Hz~200Hz)

    2. Divided by size

    The tweeters are 80mm (3in), 100mm (4in), 130mm (5in), 150mm (6in), 200mm (8in), 250mm (10in), 300mm (12in), etc. There are also 100mm x 150mm, 130mm x 150mm, 150mm x 230mm.

    3. By use

    Unit loudspeaker, set loudspeaker, coaxial loudspeaker, ultra-low frequency loudspeaker

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