Join Date: Oct 2009
Location: CANADA! Montreal (party city), Quebec
^Capacitors, by definition, take energy at a constant rate from the battery, and store it. Tha capacitor stays full all the time, and when needed, the amp will take the energy it needs from the cap, be it 0.5 farads or 1 farad, or as much as the subs need to hit the heavy bass. If you or your friend didn't notice a difference, it's because you don't have your music cranked enough or you simply don't need that much power for your system.
1 farad of electrical energy is enough to kill a person. So 5 farads is more than enough to give a big system all the power it needs when it's cranked to the max and hits a really hard bass line. Batteries are not made to be drained really fast in order to give the amp the power it needs for the subs. So it won't give as much power at once to the amp. I think maybe you don't notice the difference because you are looking in the wrong places. The cap should make your high bass hits louder and stronger, and protect your battery's long term life. Also, most capacitors will allow your system to not drain your battery out completely, which I find is also really useful (some turn off before the battery dies etc.)