What Do You Need A Capacitor For?
Today's car audio amplifiers need huge amounts of current. Often the vehicle's electrical system is unable to provide it. With your car's air conditioner is running, the factory charging system may already be operating at 70% of full capacity. When a big bass note hits or you are playing your system very loud, there may not be enough energy to reproduce all the music making your system and you coming up short.
A capacitor stores current. Its super low internal resistance allows it to give up that current extremely fast. As quick as your amplifier needs current, a capacitor can provide it. Plus, as quick as it discharges, it will recharge, ready for the big hit! Get all the sound possible from your system!