This manual is a practical guide to know, install and manage an audio system and also aims to introduce those who have not had contact with the management of a sound system. It is easy to read and understand. In addition, you can make the necessary modifications to a system already installed. We discuss topics about sound, frequencies, cables, electrical circuit, speakers, amplifiers and much more. This is the translation of the original version in spanish, Una ventana al sonido en vivo. Who can read it? The material is written for everyone's knowledge. All you need is the desire to learn.