A capacitor does not work as they should in most cases, and will create several issues with the system, that most have experienced.They are basicly useless, that a simple small battery can be so much more productive, and generate power needed.Alot of people use them ,yet they are a waste of your hard earned money along with your time invested installing it.I recommend buying a battery in place of a capacitor, in which will meet your needs, and generate more power where it is needed for your stereo system, and will last alot longer as well getting your moneys worth.There should be a thread about them somewhere on the forum?A battery is all you need