For most of us, when we own a car a must-have is a car audio system for our own driving enjoyments as well as for those being driven around. However if you believe that you can derive the maximum enjoyments out of your car audio system merely by owning one and switching it on, you are actually quite wrong as there are many other issues involved for a rounded music experience other than only switching on your car audio system. If you want to experience the best quality of music in your car there are several other features that you need to take care of. Some of us even own those accessories and features and yet do not utilize them to their fullest potential for the best sound quality. The function of equalizers, crossovers, and other signal processors is to electronically change the music signal in some way to make it more usable.