The audio amplifier amplifies the signal output from the stereo to send more power to the speakers and optimizes the sound diffusion.
An amplifier is not only used to increase the power to be sent to the speakers, but also to optimize the stereo system as a whole.
The benefits of a separate amplifier:
Allows you to send more power to your speakers while minimizing distortion
They are optimized to make the subwoofer work in the most suitable way.
They are normally equipped with crossovers that simplify the installation and make an optimal performance of the speakers.
The speakers are powered by a power source independent of the player, thus optimizing the absorption and performance. In addition, amplifiers normally use a Mosfet power supply that optimizes absorption especially on the highest peaks and commonly does not require the installation of a separate capacitor.
Depending on your stereo system, the amplifier must have an appropriate number of channels: