How important is the impact of farad capacitors on car audio systems?

How important is the Farad capacitor (CDA) for car audio systems?

We’re all familiar with the large capacitors attached to the power supply of audio systems, often equipped with voltage indicators. However, capacitors are fundamental components of electronics, including the main unit, preamp, amplifier, and even passive crossovers in speakers. Capacitors of various specifications and constructions are present everywhere, highlighting their significance! Nevertheless, due to the complexity of electrical theory, we’ll only focus on the operational principles of Farad capacitors (CDA) in the power supply and how they improve audio performance through capacitive adjustments, aiming to provide a clearer understanding of the use of Farad capacitors (CDA).

Car Audio Farad Capacitor (CDA) – As the name suggests, it’s something that can store electrical energy. If we compare a car’s alternator and battery to the source of a river, the electrical current to the river’s flow, and the amplifier to a waterwheel using the river’s flow, then the car audio Farad capacitor (CDA) is like a lake positioned between the source and the waterwheel.

When the waterwheel operates at low efficiency, the normal river flow can meet the requirements of driving the waterwheel. However, when the waterwheel needs to operate at high loads rapidly, the water flow from the source is often insufficient and can’t drive the waterwheel effectively. In this case, if we create a lake between the waterwheel and the source, when the water from the source isn’t enough to drive the waterwheel, we can quickly supplement it using the stored water in the lake. This ensures the efficiency of the waterwheel’s operation, and that’s the role of the car audio Farad capacitor (CDA)!

Furthermore, car audio Farad capacitors (CDA) possess the characteristics of long lifespan and rapid charging. When the amplifier operates at high loads, the momentary current can be quite substantial. However, the car’s alternator and battery might not be able to supply power in time. This results in decreased amplifier efficiency and compromised sound quality. By incorporating a fast-charging and discharging car audio Farad capacitor (CDA), during moments when the amplifier requires a large instantaneous current, it can maintain a stable power supply when the alternator and battery can’t provide power in time. The capacitor then rapidly charges from the alternator, preparing for the next “surge” (high-power amplifier output).

In comparison to regular secondary batteries, car audio Farad capacitors can undergo high-current charging and discharging without significant degradation, making them excellent for charge-discharge cycle lifespans. In recent years, the efficient utilization of energy (reducing oil consumption, reducing energy consumption (CO2 reduction), and effective use of new energy sources) has gained considerable attention. Currently, discussions are taking place regarding new applications featuring ultra-large-capacity support. Additionally, in the context of hybrid cars and fuel cell vehicles, discussions on incorporating ultra-large-capacity solutions for efficient energy utilization are accelerating.

China’s KAM actively develops energy-saving and environmentally friendly products, with ultra-large-capacity Farad capacitors being representative environmentally responsive products. These capacitors offer various specifications, providing high capacities ranging from a few hundred farads to over 240°F.


As previously mentioned, ultra-large-capacity capacitors differ from secondary batteries as they don’t involve chemical reactions. Instead, they store energy by physically absorbing ions on the activated carbon surface. This leads to the following characteristics:

  1. Slow aging, enabling millions of charge cycles.
  2. High output density, allowing rapid (high current) charging and discharging.
  3. High charging and discharging efficiency; even with an output density of 1KW/kg, you can achieve over 95% efficiency.
  4. Environmentally friendly as no heavy metals are used in the construction materials.
  5. High safety in abnormal conditions, as even external short circuits won’t cause failures.