**3.3 Interior acoustical sound system**

Electrical sound systems for the acoustical interior design are not useful, especially when the interior wall is acoustically designed. It has dedicated purposes when recording constituents play a role in the functional aspects. It is worth to mention that this section is an acoustical engineering field that serves the interior and its inhabitants directly. For the acoustical interior designer, the sound system exposure to three main questionings, the what, the why, and the how of the electrical sound system [10].

What are the sound system and its components? Why should we use the sound system? How to apply the sound system within ideal regulations?
