Power amplifier as an integral part of the car stereo mix, its importance is self-evident.
Car audio flow as a concert hall lonely journey into a kind of enjoyment. Whether or not the car audio enthusiasts, in the face of these full of metallic equipment will be deeply attracted by its unique magnetic. But perhaps for most people, how to choose and buy satisfaction of audio equipment is a difficult problem.
Below the hacker amplifiers (super power, large power) will introduce some tips points in the choice of the power amplifier.
Determine the same benchmark amplifier:
Power is the most important parameters in the sound system, sound system with the ability to load. This is the place where we first of all should be paid attention to when buy. But if each manufacturer USES different measurement benchmark to identify the product performance, lack of understanding it is often difficult to make objective comparisons. Power amplifier is also so, in view the amplifier's identity should be paid attention to the following three points:
First, the frequency range.
For the power output of the power amplifier should be used in the actual frequency range for testing. For power amplifiers, should identify complete testing scope, only identity doesn't make any sense to a certain frequency power value.
After determined the same benchmark, we can compare amplifier. Usually, when the sound system of choose and buy generally follow the principle of high power output. Power amplifier output power, the greater the show their ability to drive the speaker also stronger. Power amplifier power should be greater than the speaker's instructions, if choose small power, in the long-term use of high power output, easy to burn out, also can lead to poor quality, distortion, etc. The presence of the fault.
Second, the battery voltage.
Car battery voltage is often change, for the two common identification: 14.4 V, 12 V / 100 w / 100 w power amplifier is a completely different two kinds of power. Because the car in the process of driving voltage basically around 12 v, so in the condition of the 12 v voltage measured by the power value is more close to the real situation. And identification based on continuous voltage 12 v power amplifiers for more than 12 v can achieve greater power.
Third, the harmonic distortion rate of THD.
When comparing continuous output power of the power amplifier, needs to be in the same (or close to) under THD value. Under different values of THD test out the quality difference is very obvious, sometimes the identity of the maximum power is very high, but is likely to be its distortion and noise is also very high. So in the inspection of the maximum power at the same time should also pay attention to the identification of THD value.
High quality power amplifier should have factors:
Only with high-power text introduction, of course, is not able to better understanding of the power amplifier is good or bad. High-quality power amplifier must also can quickly reflect the music signal peak, at the same time to corresponding powerful heavy bass, and in the condition of low distortion/low noise can provide stable output. To meet these requirements, it must have the following points:
First of all, it is the power of the excellent performance. It is the key to the around amplifier timbre. Should put most of its power and separation of design, can reduce the noise. Using large step-up transformer to improve the stable supply of electric current, as well as large capacitor, can react more quickly, supply the required current.
Second, the parameters of the built-in equalizer. Automotive electronics and home electronics are very different, the installation position of the speaker is very limited, the adjustment of the voice is very important. In addition, because of the head and the window covering the sound effects and bass speaker installation Angle of the chaos caused by the sound wave, will effect the voice of the car audio system. When work is a parametric equalizer, it can be for all these reasons make compensation for the peaks and troughs caused by sound waves, adjust the sound field of a smooth.
Moreover, it is built-in frequency divider. No matter how good the function of the power amplifier itself, the actual installation in the car, will be all kinds of audio, speakers configuration problems to achieve the best effect. In order to overcome these, in addition to parametric equalizer using frequency divider. Built-in frequency divider has two advantages: first, the system has expanded, free of power amplifier and speaker combination. Second, make simple adjustment. So you can make a whole set of system of quality improved. Use the external frequency division system is the complex wiring easily mixed with noise, the installation time need larger space and make the system price is rising, so we should not be recommended when choosing car amplifiers.
Clear power amplifier of different purposes:
Select amplifier only simple parameters by manual is not enough, should according to the whole sound system, also need to listen to the opinions of the other users or professionals, according to different purposes of different types and brands power amplifier. According to the different USES can be roughly divided into the following categories:
Multichip X card power amplifier: unique X CARDS for choice: power amplifier offers a variety of partials high-pass, band-pass, low pass, even the super audio filter.
2. Specially designed for promoting woofer amplifiers: built-in infrasound filter, eliminating the external filter.
3. Power amplifier with equalizer: because of individual be fond of or different car set-up space sound.
4.5 -channel power amplifier: often use channel 2 or 4 channel before and after the power amplifier to drive the speaker, the woofer is by the power amplifier to drive the other, so that takes up the area is too big, and using 5 channel power amplifier, a power amplifier can solve the problem.
5. Electronic audio power amplifier module type: the control module is to let you choose which kind of signals to the power amplifier and power amplifier and RCA output, the frequency and selected need partials. By changing the module, can make a power amplifier into a variety of power amplifier is used.
Here, we simply introduced the choice of the power amplifier tips, some common sense to specific practical application, also must pass professional system design, installation, etc., of the perfect sound system.
