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Type classification of the car audio power amplifier of Huizhou Lei Bo Electronics Co., Ltd
Type classification of the car audio power amplifier of Huizhou Lei Bo Electronics Co., Ltd:
Frequency divider is the difference between the frequency of the sound signal to distinguish, respectively, to enlarge, and then sent to the appropriate frequency of the speaker in the band playback. In the high quality sound reproduction, the demand for electronic frequency division processing.
In the car switched to a set of high quality audio devices, and even a number of sound proofing, announced that the sound is not quite meet, how to do? This time can be forced into the speaker of the frequency divider on the start, should be the most cost-effective, rapid and the most direct way.Apart the forced part, the internal parts are capacitor, resistor and inductor. These three are the most direct impact on the speaker to reflect the information, each part of the numerical value is in accordance with the original plant planning and selection. Then understand that the original plant that is the best sound combination of the product level accounting. But in fact, in the world any speaker manufacturing plant has its unique individuality and personality, of course, on the sound quality effect, it may not be able to cater to every audiophile. While the heavier commercial manufacturers, it is necessary to choose the accounting can create the most profitable parts, in order to maintain a certain profit.
Although there are some real dedicated manufacturers, for consumer concerns to the importance of this part, will automatically by the way some of the parts or is not the same as the standard were forced to audio converter to local agents, by agents provide consumers to choose from. A full set of services that, in effect will add customers, promotion practices worthy promotion. But not the same brand, the value of the parts, the sound is also different, especially in the distance from the maximum sound quality. Replace audio converter parts, indeed is a feasible method to improve; but keep in mind that construction will shun is a have the sound quite experience and understand the parts of the characteristics of the master. Otherwise, the more change worse time in vain.
Inductance coil has a certain influence on the sound quality, and the hollow inductance is the plan of Higher Order sound.
The correlation between capacitance standard and sound
Known to all, the capacitor (c) on the sound line is and resistance (R) and the inductance coil (L) constitute the LCR crossover circuits, the output signal of the power amplifier, through the LCR network, in accordance with the original planning crossover points, the concave convex frequency separation exports to the different speakers.
Because the signal through the capacitor the theoretical value and phase back 90 degrees (in capacitor zero loss, but now skills is not likely to reach), signal via an inductor when the phase then forward 90 degrees (resistance to drop monomer announced the SPL and effect), think the signal phase reduction to the original phase, unless chosen as signal phase difference and impedance correcting of planning is not the same as the number of, generally complete crossover should use the same number of capacitors and inductors. So the importance of the internal parts of the frequency divider can not be ignored.
The characteristic of electrolytic capacitor is only suitable for low frequency, which is poor in high frequency.
Capacitor evolution and selection
For the general reader facelift inductance and resistance may be more difficult, need ten thousand meter to measure the numerical, in with the change, the future will be on the other in the concert hall to shew. And the capacitor due to the numerical value will be marked on the body, in the purchase is not easy to form errors, can be the most basic method of modification. The following author on the characteristics of the capacitor to the readers.
First the choice you need to understand that you want to use in the high frequency or low frequency and electrolyte capacitor is generally relatively large capacitance of the capacitance value, generally with polar (polar), generally used for power supply voltage and low frequency circuit. Electrolyte capacitors in the high frequency of the poor, if the high-frequency circuit to use capacitors, the pre selected ceramic capacitors, tantalum capacitors.
On the circuit board we can quickly identify the right is PP or MPP on the left is the capacitor, electrolytic capacitor
But because of the tantalum capacitor, although the applicable frequency broad, low leakage current, but not negative pressure resistance, if meets the horizontal and vertical anode will form a capacitor blasting, but because of its rich toxicity has gradually withdraw from the market. Now the mainstream is for the PP (polypropylene) raw material capacitance.
The capacitor has the advantages of non polarity, high insulation resistance, excellent frequency characteristics, and medium loss is very small. According to the above advantages, so PP capacitors used in the audio circuit, to ensure that the signal in the transmission, not to have too much distortion of the scene. So often can see some of the cutting-edge devices, claiming that the majority of brand-name PP capacitors, in order to do the endorsement of the quality of sound, the reason for this. But the manufacturing method compared with the traditional capacitance more difficult and expensive, must to metal foil when the electrode, and polypropylene plastic film, from both ends of the overlapping, winding into the rear of the cylindrical structure can end. So unless you do not think about the accounting of the ultra sophisticated sound system, or difficult to see the PP capacitor in the voice of the sound system.
Sometimes you will find the PP or MPP capacitors in the top grade power amplifier, most of which are used to bypass or cross link.
And then there are people announced on the plastic film in vacuum vapor plating a layer of very thin metal to do as the electrode, eliminating the electrode foil thickness, reduce the volume of the capacitor unit capacity, will PP capacitor simple made of small size, large capacity capacitor of process approach, named for metallized film (metallized film) and forward has in addition to the winding type manufacturing outside, but also present iterative method of layer type. The production of the capacitor is called MPP or MKP (Polypropylene Film Capacitor Metailized). Although the capacitor sound quality than pure PP, but not much difference between the price is much cheaper.
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