Loja do Som Automotivo is a free Android application designed for car audio enthusiasts. It features three essential tools that aid in setting up and optimizing car sound systems. The app provides a series and parallel wiring scheme that helps users determine the correct connection type to match speaker impedance with amplifier output, accommodating up to four speakers. This ensures that users achieve the best performance from their audio setup.

Additionally, the application offers a box volume calculator, allowing users to design acoustic boxes based on the shape of the speakers they are using, including rectangular, cubic, trapezoidal, and bazooka shapes. It also calculates duct volume, whether round or triangular. Lastly, the battery calculator estimates the operational time based on battery specifications and module consumption. This comprehensive functionality makes it a valuable resource for anyone looking to enhance their car audio experience.