Power amplifier abbreviated AMP, it is one of the most basic equipment in the audio system, and also the largest category. The main function is to amplify the weaker signal input from the audio source equipment to generate a large enough current to drive the speaker to reproduce the sound. If you want to get a good sound quality power amplifier PCBA, you need to consider power, impedance, distortion, dynamics, and different use ranges and control adjustment functions in the design. Different power amplifier PCBAs have internal signal processing, circuit design and production technology. They are also different.