I've got lot's of stereo stuff in my crx. I installed it all with two one farad caps. The amps still clipped off when turned to loudly because of the lack of power. I then installed an optima yellow top battery. That solved my problem. Like somebody posted above, the caps won't really supply the power you need unless you've got a strong power supply(good battery and/or alternator). I have'nt played my stereo without the caps, so i could'nt tell you if they did any good or not. I'm sure they help to a certain degree, or else, they would'nt make them. Also, a capacitor will do no good if it's not installed as closely to the amp as possible. At least that's what i read somewhere.