Amplifier is a very important part of the audio system. It not only involves signal amplification, but also involves signal processing and control. In different application scenarios, power amplifiers also need to consider power, impedance, distortion, dynamics, and different usage ranges and control and adjustment functions. Therefore, different power amplifiers also have different internal signal processing, circuit design, and production processes. For example, professional power amplifiers and home power amplifiers differ in technical parameters and application scenarios.