A car audio equalizer can be defined as a high fidelity audio control. The equalizer enables the user to control different frequency bands in an audio system. The user can also see graphically or digitally (depending on the equalizer design) these sound frequencies with the help of the equalizer.
A regular car audio equalizer includes several audio filters or amplifiers. Each audio filter is centered on a particular frequency in the audio range.
The user can then decide which frequencies need to be boosted and which need to be turned down. This requires a level of skill. But you can try it out and see what works and what doesn't.
Now, that you can tweak the frequencies to change the sound doesn't mean you should do that with every CD you insert. This should actually be done only when you're setting up, upgrading or tuning/retuning your car audio system.
