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No offense, but you are wrong about capacitors rarely making a difference in car audio. In a car audio setup, a big bass hit pulls more amperage than the alternator provides. The battery cannot react fast enough. Without one, your headlights will dim. With one, the capacitor quickly unloads the extra electricity to cover the peaks. They work well as long as they are needed in the first place and are installed correctly. In theory, I can see how they could help. If you have a bettery setup with a lot of capacity and not enough amperage for rapid acceleration, the caps could make up the difference in during a power/acceleration surge, then recharge under light load.
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