Sound Quest CAP2M 2 Farad High Performance Digital Display Car Audio Capacitor

When installing a large stereo system, Capacitors are one of the most overlooked accessories. A cap keeps your cars voltage from dropping when your system is playing; it stores energy to be used at a later time. For instance if your system hits a really low bass note your amplifier will draw more power than normal. During the few seconds your amplifier is drawing more power your lights may dim due to increased stress on your car battery, this is where the capacitor comes in by supplying an extra boost of power to your amp for those few crucial seconds.