Nowadays, science and technology are developing very rapidly, and people have begun to be inseparable from electronic products. I think most people now have a headset. The headset can enjoy music. There are good and bad headsets. We say to play with headphones. In fact, we can’t What is avoided is to build a complete system. A single headset obviously cannot produce sound, and better front-end equipment can more fully utilize the potential of headsets, especially good headsets, so I think it is necessary to talk about it. Where does the sound we hear in the headset come from. I want to briefly talk about the process of going from CD or MP3 to the sound we hear. Whether it is CD or MP3, it was originally just a combination of 0 and 1 in a certain way.