Answers: If your total system power is 1000 watts RMS or more, you will need to:
1. Upgrade the alternator to a soaring output alternator
2. Upgrade to a heavy duty reflective cycle battery
3. Upgrade the "Big 3" - to be precise to replace the power wire between the battery-operated and alternator, the ground from the battery to the chassis and the ground strap from the engine/tranny to the chassis near at least 1/0 AWG cable.
Failure to do this will result in you replacing them anyway as the alternator will eventually backfire.
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A second battery is never a right idea as it's an added strain on the alternator to charge two battery AND supply power for the car. The ONLY time a second freestyle is useful is if the audio system is to be used near the car bad.
A cap is individual good so far as the audio system isn't trying to verbs too much from the electrical system. A cap doesn't provide more power, it's designed to 'stiffen' the voltage to the amp, nil esle. If the current isn't there, a panama won't help. The alternator must hold at least 20% more amperage power than the entire vehicle and nouns system combined for a cap to be of benefit which is ironically matching requirements for an amp to be efficient.
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