The working principle of the amplifier is to amplify various sound signals played by the sound source to promote the sound of the speaker. From a technical point of view, a power amplifier is like a current modulator, which converts alternating current to direct current, and then is controlled by the sound signal played by the sound source, and transmits different currents to the speaker according to different frequencies, so that the speaker is correspondingly The sound of the size and the corresponding frequency. Due to power, impedance, distortion, dynamics, and different ranges of use and control adjustments, different power amplifiers have different internal signal processing, circuit design, and manufacturing processes.
The power amplifier is generally divided into a pre-amplifier, a post-amplifier and a combined-level amplifier. The merger is a machine that combines the pre-stage and the post-stage.
The front stage is used to initially amplify and adjust the volume; while the latter stage is to amplify the signal from the previous stage to drive the speaker.
The pre-stage is also divided into active and passive. The active front stage uses a power supply to amplify the signal, while the passive front stage only regulates the volume. Honestly, there are not many passive pre-stages that are successful today, because the internal resistance of the sound source and the rear stage are very different. Only one volume switch is used to connect the sound source to the rear stage. The difference of internal resistance will make dynamic, detail, and frequency. Should be lost! In addition to adjusting the volume, the active front stage can also be used as a buffer for the majority and lowering the internal resistance between the sound source and the rear stage.
The latter stage amplifies the signal from the previous stage to the speaker, and the rear stage must be strong enough to push the speaker. The so-called power is not the greater the sound. Must have the ability to support the entire scene of the orchestra without losing its details.
Separating the front and back levels is better than the merger, because each has more space to make it more sophisticated. There is less interference between the two, and the details are more. Moreover, separating the front and rear levels will give the enthusiasts more choices to push the machine, and more things can be played.
At present, according to the current demand for audio consumption, we know that the amplifiers in civilian audio have been basically shaped into two categories, namely pure music amplifiers and home theater AV amplifiers.
1, pure music amplifier
The pure music amp design emphasizes the lowest signal distortion, faithfully shows the scene, details and performance of the music, recording skills to meet people's best appreciation of music requirements, which is often said HI-FI (hi- Fidelity, high fidelity). Pure music amplifiers are extremely demanding in design and production. The quality of a pure music amplifier is not completely determined by its technical indicators. It cannot be simply seen how high the power it marks, how wide the frequency response, and how low the distortion is, but should pay special attention to its design and production process and the clarity of music.
2, AV amplifier
It generally includes a power amplifier section and a signal processing section. The principle of the power amplifier is no different from the traditional power amplifier, except that several channels are added, that is, several power amplifiers are combined together; the signal control processing part involves signal audio, video selection, signal decoding processing, and signal. Sound field processing and functions such as radio and monitoring. Generally, a high-quality AV power amplifier should first have a better sound field reduction in the signal processing of the film and television program, the channel isolation is high, and the atmosphere rendering can not be too exaggerated; secondly, the sound quality performance of the power amplifier part, especially the main The sound quality of the channel is as close as possible to a better pure music amplifier.
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