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1. Car Power Basics > 8. Use a Huge Capacitor to Sustain Power

Use a Huge Capacitor to Sustain Power

A large capacitor is often used to maintain bass amplifier response, and can address other problems as well—including voltage sags when the car is started.

One of the many goals of aftermarket car audio systems is to create a reverberation that exceeds the boundary of the car, shaking other nearby cars and buildings. Car audio enthusiasts have been using 1-farad capacitors for years to make sure their cars go Boom! Boom! without brownouts or voltage sags.

Bass response is the ability of the subwoofer to reproduce the low-frequency bass sounds in music with fidelity. One of the problems with subwoofers is that they need a lot of electrical energy to move the large speaker to reproduce the low-frequency bass sound waves. When the bass beat kicks hard, the speaker should instantly slam in response—but often, the car’s battery and electrical system can’t put out enough power to ensure an instant response.


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