How to select the power amplifier in car audio
How to select the power amplifier in car audio：
Car stereo modification in the economic prosperity of the first tier cities have already car service industry is popular, perhaps in the street randomly pick a private car owners, he know of sedan stereo sense is contrast all, and some are even capable of self deployment from a want of car audio equipment, and then to refit store to ask a person to change.The car sound as the music hall to become a lonely enjoyment. As an integral part of the car audio system, the main characteristic is obvious. Whether it is not a car audio enthusiasts, facing these filled with metallic devices will be its unique magnetic deeply attract. But perhaps for most people, how to choose the satisfied sound device is a problem.
Here we will introduce some some tips for our selection of power amplifier.
Determine the same reference contrast power amplifier power
Power is the most important parameter in the sound system, indicating the ability of the audio system with load. This is the first time we should pay attention to the purchase of local. But if each manufacturers are using their different benchmarks to identify commodity function, the lack of satisfaction with the general know it is difficult to make an objective comparison. So is the power amplifier, in the examination of the power of the power amplifier should pay attention to the following three points:
NO1: battery voltage.
Car battery voltage is often changed, on the two commonly identified: 14.4V/100W, 12V/100W power amplifier is completely different from the two kinds of power. Because the car driving voltage in the process of basically at the mercy of 12V, so in 12V voltage measured power values for near real situation. And to continue the voltage 12V as the benchmark for the power of the power amplifier in the arrival of more than 12V can reach a greater power.
NO2: harmonic distortion rate THD.
In contrast to the output power of the amplifier, the same (or is more close to the THD value of). Not the same as the THD value of the test out of the sound quality is very significant difference, and sometimes the maximum power of its logo is very high, but it may be the same as the distortion and noise is also very high. Therefore, in the inspection of the maximum power should also pay attention to the value of the THD value.
Click on the original check
NO3: frequency scale.
The power output of the power amplifier should be checked in the frequency scale of its practical application. On power amplifier power, should be asked to identify the size of the integrity of the inspection, only to identify the power value of a frequency has no meaning.
After determining the same benchmark, we will be able to compare the power amplifier. In general, in the purchase of audio system in general to comply with the high power output criteria. Amplifier output power is greater, indicating that they drive the speaker's ability is stronger. Amplifier power should be greater than horn indicated power, if the selection of power is too small, in the long-term use of large output power, simple burn, still can cause poor quality, such as distortion and failure.
Excellent power amplifier should have the elements
Of course, only with a large power of the text is not able to better understand the power amplifier is good or bad. Excellent power amplifier also need to be able to quickly response to the peak of the music signal, together with the corresponding strong low noise, and in the low distortion / low noise state can supply steady output. To satisfy these requests, it is necessary to have the following points:
First and foremost, is an excellent power supply. This is the key that controls power amplifier. The power department and the expansion of the Department should be part of the planning, can reduce noise. Selection of large step up transformer to increase the supply of stable current, as well as large capacitors, can more quickly respond to the supply to expand the required current.
Second, built in the parameters of the device. Car audio and home audio are very different, the speaker of the device position is very limited, sound conditioning is very important. In addition, the sound effect of the car sound system can be caused by the sound effect of the head restraint and the window, and the acoustic disturbance caused by the viewpoint of the device in the low voice speaker. When the parameters of the device, it can on the formation of the above factors of acoustic wave crests and troughs of compensation, conditioning smooth sound field.
Moreover, that is the built-in frequency divider. No matter how excellent the power amplifier itself, the practice device in the car, but also because of a wide variety of audio questions, the speaker's equipment is not in doubt and can not reach the best effect. In order to overcome these, in addition to the parameters of the use of frequency divider. Built in frequency divider has two major advantages: first, the system has the expansion of the power amplifier and the speaker can be combined. Second, the conditioning is simple and easy to operate. So can make the sound quality of the whole set of system to be improved. Using external divider system because the wiring is more messy, simple mixed with noise, device needs large space and the quotation system rise. Therefore, in the selection of car with power amplifier we don't recommend.
The power amplifier is not the same!
Select power amplifier only by elucidating the book gives a brief parameters is far from enough should be according to all the audio system, need to listen to take another application or professional personnel, according to the different use choose different types and brands of power amplifier. Can be divided into the following categories according to different uses can be divided into the following categories:
1 special planning to promote the woofer amplifier: built-in infrasound filter, eliminating the external filter.
2 band equalizer amplifier: due to their own preferences or not the same as the adjustment of the space of the compartment.
3.5 channel amplifier: the general use of 2 or 4 channel amplifier to push forward and back speakers, in a low voice loudspeaker is a power amplifier to promote, so occupy