Quickly understand HIFI/AV power amplifier

                                   Quickly understand HIFI/AV power amplifier

Many people have entered the era of listening to multimedia speakers, but there are still many music enthusiasts who continue to use expensive, troublesome and space-consuming traditional HiFi systems, but this is indeed something that the public who use multimedia speakers cannot understand or enjoy. A musical quality. The users who use traditional HiFi audio to listen still maintain a large proportion, and with the continuous improvement of the public's understanding of sound and the continuous improvement of music literacy, the pursuit of listening has indeed surpassed the era when computers first appeared, and even returned to basics. The phenomenon is advancing—more and more people are joining in the fun of building traditional systems.

But as an entry-level user, how to match loudspeakers and power amplifiers is obviously more complicated than using multimedia speakers. Many people want to choose a suitable power amplifier, but AV power amplifier, HiFi power amplifier, high power, pure Class A, integrated, digital amplifier, tube amplifier, transistor amplifier, field effect, pre-amplifier, post-stage... various terms It's confusing.

Among the power amplifiers in the civilian field that we can see every day, we can often see two types of HiFi power amplifiers and AV power amplifiers, which is easy for many people to fail to understand. If explained in Chinese, these two types should be high-fidelity power amplifiers and audio-visual power amplifiers, and the difference between these two power amplifiers can be described as quite large. The HiFi power amplifier requires the audio equipment to amplify and process the various indicators of the sound signal without distortion during playback, so as to restore the original appearance of the sound as much as possible.

The HiFi power amplifier focuses on the reproduction of the sound, and it is a power amplifier specially used to enjoy music. The AV power amplifier is specially designed for audio-visual appreciation. It is a trial-listening amplifier that combines audio and video signal processing, and is specially used for home theater equipment. AV power amplifiers focus on the atmosphere of the sound field, and there are great differences in technical indicators, sound field performance, sound quality performance, number of channels, and circuit design.

The technical indicators of HiFi power amplifier include output power, resonance distortion, signal-to-noise ratio, frequency response range, rated impedance and damping coefficient, etc. HiFi power amplifier does not blindly pursue high power, but pays more attention to parameters such as resonance distortion and signal-to-noise ratio. In addition to these parameters, the AV power amplifier also has channel isolation, delay time range, and parameter indicators of DSP system, home THX system, Dolby AC-3 system and other sound field modes. In addition, the AV power amplifier also has some video parts. Indicators, it pays more attention to power and the above parameters.

The HiFi audio system is composed of 2 channels, that is, the left channel and the right channel. We can see that there are only two speakers in the HiFi system. Whether it is a bookshelf or a floor-standing speaker, just place one on the left and right. The main purpose of the HiFi power amplifier is to amplify the signal from the signal source to obtain a stereo sound field for music appreciation. The AV power amplifier may have 4-9 channels or more to drive multi-channel speakers. It builds a surround sound field through left, center, right, surround, bass, etc. It pays attention to the structure of the sound atmosphere, emphasizing the sound field and orientation It is specially designed for movie appreciation.

The circuit design of the HiFi power amplifier is relatively simple, because there are few signal processing programs, it is only a combination of amplification, switching, and adjustment circuits. The AV power amplifier has more decoding circuits, delays, reverberation circuits, etc. than the HiFi power amplifier, and the AV power amplifier needs to be responsible for amplifying multiple signals; in addition, the AV power amplifier also has a video circuit in the circuit composition, so the integration level High, the design of the circuit is more complicated, and there are more procedures for signal processing.