According to this thread, even a 20 farad capacitor doesn't hold enough energy to be useful in a car audio setup...

Why you don't need a capacitor - Realm of Excursion: Forum

...so it begs the question... What IS?

 

i think caps are , i hooked one up and it seemed to be quiteer

 

to answer your question "WHAT IS?".........good battery.

 

A capacitor will help take load off the Alternator. Which is exacly what a Capacitor is is used for to hold electrons. It's like a battery except it works in completly different ways.

I don't understand why people think they are totally useless. If people don't feel like upgrading there wiring they can always use a cap...

 

You obviously didn't read the article. A cap can only hold enough power for a fraction of a second.

Charge up a cap and hook your amp up directly to it alone, blast the music and post back with how long it powered it.

 

So you'd say good battery is the number 1 in the chain?

What about alternator? Or adding a second battery?

 

if you gonna add a second battery you better makesure your first one is good as well, otherwise you are not fixing anything and just increasing the alternator load.

 

Capacitor = hold charge.

 

Ther're not suppose to help out amazingly. It help'd my friends car headlights from dimming so it obviously does something.

 

your friend should have done the big 3 instead. much cheaper and much more effective.