capacitors do make a difference. you are storing electric charge that is used on demand. when the car is on your capacitor is charging until it attains maximum charge. once this results you basically have an open circuit, no current going to your amplifier. now when the amp is on it draws from the capacitor which charges and discharges exponentially as a function of the amplification needs. it helps your electrical system a lot. when this doesnt elimenate your power surges, then get a bigger alternator, but the capacitor is still very useful in helping the rigorous flucuations in your power system. plus they are cheap now adays, dont have to be a baller to own one. so not just for spl, good for daily drivers. now if you have a class D amplifier, then the need is far less.
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