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capacitors are used to
1) prevent damage to battery and alternator
2) prevent clipping from speakers
3) create optimal wattage for an amplifier
it protects the battery and alternator by storing energy so when subs are hitting the hardest they drain from the capacitor's resevoir instead of directly from your battery which puts a strain on your alternator to keep the battery powered. Also amps are usually rated at 14.4 volts and a cars electrical system is usually in the 12 volt range so adding a cap lets your amp be powered at closer to 14 volts resulting in more wattage output to the subs or speakers.
any major businesses will carry caps such as best but, circuit city, I have even seen the at wallmart though they are not as strong. Also when buying a cap remember 1 farad rating on the cap means it can supply power effeciently to around 1 thousand watts. if you have a 2 thousand watt system then look for a 2 farad cap.
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