Interesting Qualities of the Best Car Audio Capacitor

A capacitor is an electronic device with two plates separated by an insulator. This device collects and stores power just like ​a battery.

The value of the capacitor [known as capacitance] is determined by the overall surface area of the plates and ​the distance between them. The term ​used to describe the capacitor’s capability to store energy is known as Farad.

Finding the best car audio capacitor is not ​easy. You need to consider several factors before you decide which capacitor to buy. Capacitors are typically available in cylindrical shapes that are 3 inches in diameter and one foot long. There are capacitors which are rectangular in shape but these are used in different technologies.

It has negative and a positive terminal, and a third remote power ​terminal that ​switches an LCD display on or off. Regardless what shape they come in, they are designed for one purpose: to store electrical power. Here are 3 of the best power capacitor for car audio that you can consider.



Image Dimension Capacitance ERS Working


Soundquest SQCAP2M 2 Farad Power Capacitor


13 x 9.5 x 3 inches

2 farad

Ultra low


BOSS AUDIO CAP8 8 Farad Capacitor BOSS-AUDIO-CAP8-8-Farad-Capacitor

10 x 5 x 2.5 inches

8.8 farad



Power Acoustik PC1.5F 1.5 Farad Digital Power Capacitor


12.5 x 4.2 x 3.2 inches

1.5 farad



What to Consider When Choosing The Best​ Car Audio Capacitor

1. The Size

The accepted rule since the time car audio power capacitor was introduced has been one Farad of capacitance per 1,000 watts of power, with ​one Farad as the minimum. More than this ​is not necessary but it does not hurt either.

2. The Capacity / Capacitance

In choosing the best capacitor for your car audio, you will encounter the term capacitance. It refers to the diameter of the capacitor. ​Just as a ​larger tank can hold more water, so a ​larger capacitor can hold more electrons.

3. The ESR or Equivalent Series Resistance

Normally, a capacitor would only have capacitance. As you know, all conductors have resistance. There are multiple conductors in a capacitor: ​the foil, the electrolyte and the wire leads. The ESR contributes to the capacitor’s resistance. It is just like having a resistor in series with the right capacitor. Those with high ESR will have less capability to pass electricity from its plates to the external circuit. If you are using a capacitor as a filter, choose the one with low ESR.

4. The Working Voltage

Another important characteristic of ​a car audio capacitor is the working voltage. This defines the maximum continuous voltage either AC or DC that can be applied to the capacitor without failure on its working power. Generally, the working voltage is expressed in WVDC or working voltage DC which is printed on the side of the capacitor’s body. Any excess DC voltage of its working voltage may cause failure. The common DC voltages are 10V, 25V, 16V, 63V, 1000V, 50V, 35V, 400V and 200V.

5. The Tolerance (+%)

The tolerance in capacitors is expressed as plus or minus value generally less than 100 pF. The capacitors are rated based on how near to their actual values they are compared to the rated nominal capacitance, with colored letters or bands used to indicate actual tolerance. The most common tolerance value is either 5% or 10% but there are some that are rated as low as ±1%.

Top 3 Best Car Audio Capacitors

This car audio capacitor review will describe some of the best features of the top performing capacitors in the market today. The products listed here are some of the best brands that offer car audio capacitor.

Image Product Editor rating

Soundquest SQCAP2M 2 Farad Power Capacitor


BOSS AUDIO CAP8 8 Farad Capacitor

Power-Acoustik-PC1.5F 1.5-Farad-Digital-Power-Capacitor

Power Acoustik PC1.5F 1.5 Farad Digital Power Capacitor

1. Soundquest SQCAP2M 2 Farad Power Capacitor

The capacitor is recommended as a power reserve. It stores energy and releases it quickly to the amplifiers. When you play music in your car, the amplifier needs a constant amount of power to function efficiently and provide power to speakers. A capacitor like Soundquest SQCAP2M 2 Farad Power Capacitor will provide continuous power to the amplifier to have a better sounding system.


Editor rating

  • 20V Surge Capability
  • Ultra Low Esr For High Current Output
  • Brushed Aluminum Body
  • ​Reverse Polarity Warning
  • Satin Finish Terminals

2. BOSS AUDIO CAP8 8 Farad Capacitor

A car audio capacitor is known as a secondary, passive storage device, used to provide the ​necessary current to the amplifier. It acts as a supplemental power supply between your audio system and your car’s electrical system. They are normally cylindrical in shape, 3 inches in diameter and ​1 foot in length. It has a positive and negative terminal.


Editor rating

  • 8 Farad capacitor
  • Audible warning tone for reverse polarity
  • ​8 Farads with digital voltage display
  • ​Audible warning tone for low battery voltage
  • ​Blue Digital Voltage Display
  • ​Audible warning tone for voltage overload
  • Digital Voltage Display and Blue Illumination

3. Power Acoustik PC1.5F 1.5 Farad Digital Power Capacitor

This capacitor has the lowest Farad among the three products mentioned in this article, but it can still provide the ​power your car audio system ​needs. It also has the lowest resistance and it is ideal if you will use the capacitor as a filter.

Editor rating

  • Keeps Voltage up so bass hits hard
  • Mounting Brackets
  • ​Easy Installation
  • ​Digital Display
  • 12-16 DC Volts Operation

What is the Best Capacitor for your Car Audio?

When it comes to choosing the best car audio capacitor, you need to think about the important features of the capacitor. If you are looking for a capacitor with higher Farad or capacitance BOSS AUDIO CAP8 8 Farad Capacitor is a perfect choice. At 8 Farad it can hold enough water and electron to provide the needed power. The Boss audio also has the best tolerance compared to the other two capacitors.

But if you are looking for a smaller capacitor then choose the Power Acoustik PC1.5F 1.5 Farad. The Power Acoustik can still provide the required power for continuous functioning of your audio system.


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