Stage sound is a device that can play a very important role on the stage. He can record and reproduce the sound source. In fact, the replay due to its high precision, so it can use it to play music, or a variety of special effects, the concentration of an infinite loop, the reverse cycle repeated playback etc.. What is the width and depth of the sound field is generally understood as the two channel (or multi-channel) sound reinforcement, the level of sound radiation angle. Depth is the depth of feeling. These are what we call the three-dimensional sense of sound. What is the sound field sound field is the sound field, the sound energy radiated by the sound source. The area of sound waves in a medium is called a sound field. Speak a little, listen to the sound. In the design, installation of a set of lighting and sound system to know the knowledge, can not help but meet the amplifier and speaker adapter. In the tone, will pay attention to whether it is suitable for cold and warm, soft and moderate, and ultimately make the whole set of equipment to restore the tone neutral, which is only from the artistic considerations. From the technical aspects of the power amplifier and speakers are connected with the elements are: first, the power matching, two, power reserve matching, three, impedance matching, the matching of damping coefficient, four. If we recognize the above four points in the distribution, the equipment can be used to achieve the full and maximum performance.