Regardless of whether or not car audio enthusiasts, the face of these metal-filled equipment will be deeply attracted by its unique magnetism. But for most people, how to choose satisfactory audio equipment is a problem.
Below we will introduce you a few tips in the selection of power amplifiers.
Determine the same reference to compare the power of the amplifier
Power is the most important parameter in an audio system, and represents the ability of the audio system to carry a load. This is also the first thing we should pay attention to when buying. However, if each manufacturer uses different measurement standards to identify product performance, it is often difficult to make an objective comparison without sufficient knowledge. The same is true for power amplifiers, and the following three points should be noted when viewing the power amplifier logo:
First, the battery voltage.
The voltage of the car battery is constantly changing. For two commonly used signs: 14.4V / 100W and 12V / 100W power amplifiers are completely different power specifications. Since the voltage of the car during driving is basically around 12V, the power value measured under the 12V voltage state is closer to the real situation. And the power amplifier with continuous voltage 12V as the reference power can achieve greater power when it reaches more than 12V.
Second, the harmonic distortion rate THD.
When comparing the continuous output power of the power amplifier, it needs to be performed under the same (or relatively close) THD value. The difference in sound quality tested under different THD values ​​is very obvious. Sometimes the maximum power of the logo is very high, but it is likely that its distortion and noise are also very high. Therefore, when checking the maximum power, you should also pay attention to the THD value.
Third, the frequency range.
The continuous power output of the power amplifier should be detected within the frequency range in which it is actually used. For the power of the power amplifier, it is required to mark the complete detection range, and the power value at a certain frequency has no meaning.
After determining the same benchmark, we can compare the power of the power amplifier. Generally, when purchasing a sound system, generally follow the principle of high power output. The larger the output power of the amplifier, the stronger their ability to drive speakers. The power of the power amplifier should be greater than the indicated power of the speaker. If the selected power is too small, it will be easily burned out when the high-power output is used for a long time, and it will lead to the failure of poor sound quality and distortion.
Factors for high-quality power amplifier
Of course, the textual introduction of high power alone is not enough to understand the power amplifier. A high-quality power amplifier must also quickly reflect the peak of the music signal, at the same time be able to respond to a strong subwoofer, and provide a smooth output in a low distortion / low noise state. To meet these requirements, you must have the following:
First, it is a power supply with excellent performance. This is the key to the sound quality of the left and right amplifiers. The power supply unit and the amplifier unit should be designed separately to reduce noise. A large step-up transformer is used to increase the supply of stable current, and a large capacitor can react more quickly and supply the current required for amplification.
Second, the built-in parameter equalizer. Car audio is very different from home audio, the installation position of the speaker is very limited, and the adjustment of the sound is very important. In addition, due to the sound blocking effect of the headrest and car window and the sonic chaos caused by the installation angle of the woofer, the sound effect of the car audio system will be. What works at this time is the parameter equalizer, which can compensate the peaks and troughs of the sound waves caused by the above reasons and adjust the smooth sound field.
2. Improvement of the engine control unit (ECU)
1. Optimization of the engine control unit program
According to the use requirements of the car in different regions, the engine power can be increased by modifying the program of the engine control unit to achieve the purpose of improving the power of the car. When the car leaves the factory, the manufacturer leaves more room for adjustment of some parameters of the engine control unit. Improving the engine control unit program can maximize the potential of the engine. After the program of the engine control unit is modified, a special instrument needs to be used for the road test. If possible, it can be tested on the eddy current dynamometer in order to obtain more accurate data. The road test will be installed after the complete adjustment.
The methods of modifying the engine control unit program can generally be divided into three types: the first is to improve the original car engine control unit by changing the chip, adding a board or rewriting the program; the second is to not change the original car The engine control unit is connected to the auxiliary device at its output end, thereby changing the output signal of the original car computer to achieve different control effects; the third is to replace the more powerful engine control unit.
2. Variable computer control
Variable computer control refers to installing three engine control units on a car, designing programs according to the three operating states of engine low speed, normal and maximum power output, and switching the corresponding control units to work according to actual needs. If these three working modes are implemented by one control unit, the difficulty of program control will increase greatly, and when the control unit fails, the car will not be able to run, so from the perspective of safety and reliability and easy to implement, consider using The design of the three engine control units is more reasonable.
3. Strengthen the maintenance of automobiles
1. Improve the technical level of car maintenance
Prompt and correct maintenance will prolong the service life of the car, which is an important link to ensure driving safety and give play to the power of the car. Maintenance companies can take the following measures in the process of car maintenance to ensure the quality of service and improve the maintenance technical level of maintenance personnel.
(1) In the maintenance of the vehicle, in order to avoid missing items, the maintenance company should try to use the "two-person operation" method, and require the maintenance personnel to ensure that the quality of each maintenance meets the requirements and reaches the technical specifications.
(2) Regularly train maintenance technicians to discuss and solve problems arising in the work. At the same time explain some new models, new technology knowledge, in order to achieve the purpose of improving the technical level of car maintenance personnel.
(3) For replacement parts, use original accessories or accessories from regular manufacturers that meet the standards to ensure that their performance and life meet the requirements specified by the original manufacturer.
(4) Instruct users to master the most basic car maintenance knowledge, so that they can carry out regular inspections in accordance with relevant regulations.
2. Use high-quality fuel and lubricants
(1) Choose high-quality fuel that is clean and meets quality requirements. Unclean fuel will cause poor oil flow, and fuel that does not meet the quality requirements will cause the engine to deposit carbon, even knock or cause parts to be corroded. Only by choosing the correct label, clean and high-quality fuel can the power of the car be fully exerted.
(2) Improve the quality of lubricating oil. Lubricating oil includes products such as engine oil, gear oil and grease. The selected lubricating oil should meet API standards. The improvement of the quality of the lubricating oil further ensures that it will not deteriorate under high temperature and high pressure, prevent the formation of colloids, carbon deposits and acidic substances, and also can increase the thickness of the oil film, reduce the wear between moving parts, and protect the machine parts from corrosion , Increase engine power, reduce noise and extend the service life of machine parts.
3. Reasonable selection of additives
(1) Gasoline additives. Adding additives to gasoline can remove carbon deposits, reduce fuel consumption, avoid oxidation of metal surfaces of automobile engines, prevent corrosion of oil pipelines and oil circuit systems, and clean oil circuits.
(2) Diesel fuel additives. Additives for diesel, such as diesel anticoagulant, can improve the low temperature fluidity of diesel and prevent diesel freezing at low temperatures.
(3) Engine oil additives. After adding additives to the engine oil, it will help to improve the starting performance; it can extend the service life of the engine and increase the power; the sealing between the piston and the cylinder is improved, so the cylinder pressure will be significantly increased, so that the power of the engine is improved.
(4) Gear oil additives. Gear oil additives have the following functions: reduce energy loss during mechanical transmission, reduce engine oil consumption to a certain extent; improve oil film strength, improve the extreme pressure resistance of gear oil, and avoid gluing, wear, plastic deformation, fatigue and fatigue on the gear surface Damage such as breakage.
(5) Air conditioning system additives. Additives used in air conditioning systems can reduce the energy consumption of air conditioning systems, reduce friction and noise, remove odors, extend the compressor oil filling cycle and the service life of various components in the system.
Applications:
The Grounding Transformer is a kind of auxiliary transformer that used to offer an earth point for the Delta-Star system. They are typically used for providing a path to ground for unbalanced load current and for fault currents on system where a suitable ground is otherwise not available.
Design:
The grounding transformers are generally designed with one of the two configurations: Zig-Zag (Zn) with or without an auxiliary winding or a Wye (Ynd) with a delta connected secondary. The Zig-Zag connection is preferred as it is more cost effective and have smaller size than the Delta-Wye unit. For more safety, neutral earthing resistors (NER) are often used in conjunction with the grounding transformer to limit neutral ground fault current magnitude. The rated voltage of the NER should be equal to the line to ground voltage of the grounding transformer. The current rating and duration should match the grounding transformer
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