Power amplifier refers to power amplifier. The effect of the original car audio system is not very good. Some music enthusiasts like to modify the car audio, but if the speaker is modified separately, the sound effect will not be improved significantly. Therefore, it is necessary to modify the power amplifier at the same time to achieve a better sound effect. The basic definition of car power amplifier is power amplifier, also called car audio power amplifier. Car audio equipment, like home audio, also use power amplifiers. Because the car power supply voltage is only 14.4V, power (P) = voltage (U) x current (I), if only the host's own power amplifier is used, the maximum can reach 4x55W, which can only drive low-power speakers, and the volume is turned on. It will be distorted, and the sound will sound hard and lack flexibility. The human hearing has a limit, and the lower limit is less than the upper limit of the volume that can be heard. This is why music always feels stronger at the beginning. The power amplifier is designed and used to match the sound quality from the sound source, especially the digital sound source. It will not degrade the sound. On the contrary, it has extremely high efficiency, minimal power loss, and wide use. It can expand the system and upgrade it. , For audio enthusiasts, it is an indispensable equipment. In addition to the basic car amplification function, what I want to ultimately want is not to change the sound quality after the power is amplified. This is the most basic premise, and it is also a valuable feature of the power amplifier. Nowadays, people's pursuit of music is getting higher and higher. Dynamic stereo, surround sound, etc. are all people want to achieve the kind of realistic effect, so the car amplifier is produced to achieve this effect. According to the channels, there are monophonic, two-channel, four-channel, five-channel, etc. Mono channels are mostly used to push subwoofers. Mono channels have only one channel output, which is also a bass power amplifier. The mono power amplifier is characterized by high power. Two-channel push two-way speakers, of course, can also be used to push subwoofers, such as two-channel bridge (parallel), can be used to push the subwoofer when the high power is obtained, and the four-channel amplifier is used to push the package Speakers, such as two-way, three-way, coaxial speakers, etc. From a professional point of view, the output power of the power amplifier must be greater than the power of the speaker. If you use the best point to calculate, the power amplifier is best if it is half of the power of the speaker, because only enough power output can the speaker have the best performance. Some enthusiasts compare the power amplifier in a car audio system to a car engine. Only when there is enough power, the car will run smoothly and fast. According to different purposes, it can be roughly divided into the following categories: 1. Specially designed power amplifier for driving the woofer: built-in infrasound filter, eliminating the need for external filters. 2. Power amplifier with equalizer: the tone can be adjusted according to personal preference or different compartment space. 3.5-channel power amplifier: usually a 2-channel or 4-channel power amplifier is used to drive the front and rear speakers, and the woofer is driven by another power amplifier, which takes up too much area. When using a 5-channel power amplifier, one power amplifier is enough. Can solve the problem. 4. Multi-chip X card power amplifier: The unique X card provides a variety of crossover options for the power amplifier: high-pass, band-pass, low-pass, and even super audio filters. 5. Electronic crossover modular power amplifier: These control modules select which signal will go to the power amplifier and the RCA output to the power amplifier, and select the required frequency and crossover point. By replacing the module, a power amplifier can be used as a diversified power amplifier. Crossover, also called crossover, is one of the most important equipment in car audio speakers, and it is also the equipment that can highlight the personality of a set of audio modification equipment. This equipment usually appears in package speakers. A package speaker with a pair of tweeters and a pair of mid-bass speakers will be paired with a pair of crossovers as an indispensable part of the car audio to form a complete package speaker. It is mainly used to control the electronic models of high-frequency and low-frequency circuits, so that the audio signal flowing through the speaker unit conforms to its frequency response range. With the current level of technology, it is impossible for any single car horn (unit) to completely reproduce the various frequency bands of the sound-even the "full frequency band" unit is relatively speaking. Therefore, high-quality audio reproduction systems often use high, medium, and low-frequency units (three-way) or high and low-frequency units (two-way) to play sound signals in their respective frequency bands. The frequency divider is just such a device. It divides the entire audio range into several frequency bands according to the performance of each frequency band unit used. After low-pass, band-pass and high-pass filtering, they are sent to their respective power amplifier channels and then promoted. The units in the respective frequency bands (active frequency division), or the power signal of the full frequency band output by the power amplifier, are fed to the units in the respective frequency bands after low-pass, band-pass and high-pass filtering (passive frequency division). Whether it is active frequency division or passive frequency division, its function is to make the signals of each frequency band "separate", and the units of the respective frequency bands perform their duties and cooperate with each other to complete the playback of the entire audio frequency band; at the same time, it also Play the role of isolating low-frequency signals or direct current from flowing into the middle and high-frequency units, and avoid damaging their delicate voice coils. If the car audio is installed with an external power amplifier, whether to install a crossover should be determined by the characteristics of the external power amplifier and personal preferences. Many modern car amplifiers are equipped with multi-channel audio output in order to be easily installed and used in the car. The sound frequency range of each channel has been simulated by the effect, and even the speakers are equipped to achieve the best effect. The power amplifier does not need to install a frequency divider. If the individual has no special requirements for a simple audio power amplifier, there is no need to install a frequency divider. Some people have audio power amplifiers with particularly good effects on hand. After connecting to the original speakers of the vehicle, they find that the sound does not meet the personal ideal requirements, and the effect of the installation of the crossover is confirmed to be satisfactory after testing, or additional configuration is required When the speaker improves the pronunciation effect, you can choose to install a frequency divider. 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The difference between installing an external power amplifier and installing a crossover in car audio
The built-in frequency divider has two major advantages: First, the system is expandable, and the power amplifier and speakers can be combined freely. Second, it makes adjustment simple and easy. In this way, the sound quality of the entire system can be improved. The use of an external crossover system is more complicated in wiring and easy to mix in noise. It requires a lot of space during installation and increases the system price. Therefore, we do not recommend it when choosing a car power amplifier.