Q. What do you call an electrical engineer that fails out?
A. mechanical engineer.
This goes all the way through civil engineer, industrial engineer, then management engineer...
So when you use a capacitor in this way its for power conditioning, when you use it with an amplifier its for power support... IE, the capacitor in your car's system is storing power, so when all of a sudden the beat hits, and your amp drains a lot of power, it will take the extra that it needs from the charged up capacitor instead of doing things like dimming your lights. Capacitor will charge up automatically waiting for the next hit of bass.
Adam