Home / Audio / Capacitors / Best Capacitors For Car Audio Systems [Reviews & Guide] 2023

Best Capacitors For Car Audio Systems [Reviews & Guide] 2023

A car audio capacitor is an electronic component that stores electric energy and discharges it rapidly. Unlike car batteries, they’re built to release their stored power quickly. Capacitors require less time to recharge or be restored by hand from a discharged state before being utilized again before use.

When shopping for car audio capacitors, it’s important to be aware of their polarity as well as the working voltage. The best capacitors are designed to work in perfect harmony with your car’s speakers.

They will use the voltage produced by these units, which can deliver a much louder sound than what you’re used to hearing without them. In order to keep your current vehicle running smoothly, it needs a healthy battery.

That’s why you should also invest in some extra capacitors. These smaller devices will store the energy from other electrical components so that they can work when needed without relying solely on electricity coming straight off of the car’s battery.

Find out what are the best capacitors for car audio by checking out the following reviews. Also, read our guides on how to choose the right capacitor for your specific needs.

How to find the best car audio capacitor?

You might think that you don’t need a car audio capacitor, but trust me – those big speakers and booming subwoofer will benefit from one.

If you already invested tons of money building up your car audio system, then it would be silly not to get one of these devices. Here are a few key features you need to know to find the best capacitor for your audio system:

Value rate

To ensure that your car audio capacitor lasts as long and plays music just the way you want, make sure it has a high-value rate or working voltage range. This value can be measured in terms of farads and will help determine how long you’ll have before your device runs out of power.

Surge voltage rate

The surge voltage rate is the maximum amount of energy that a capacitor can handle and discharge in a short period of time. This is important to consider if you have a system that relies on quick bursts of energy, such as subwoofers.

You will want to make sure your battery and alternator both have enough juice before hooking up the cap because if they don’t then, it might overload or misfire!

Voltage protection

A protection circuit is a must-have for any electronic device that uses power. A capacitor with voltage protection on both the high and low ends is ideal. This is the best way to protect your valuable equipment from being damaged by voltage overload.

Try to purchase a unit that has an automatic shut-off feature. With this feature, you won’t have any worries about accidentally leaving it on when not in use.

Charging time

Typically a capacitor takes less than 5 minutes to charge. If you have one that takes longer, consider swapping it out with another one. When it takes so long to charge a cap, it’s generally an indication that it’s broken. This may lead to them burning up and breaking, which could cause smoke or fire.

LED display

Capacitor displays are a great way to keep an eye on your battery’s life. There is also the option for them as lights, which makes it easy and convenient when charging at night time or in darker areas where you might not be able to see what charges properly otherwise.

The clear LED display lets you know how much charge remains in your capacitor, so it can be charged up just right before you head out for a drive. This feature is especially ideal if your battery is really low on energy and the capacitor is needed as a backup source.

Top 10 Best Car Audio Capacitors

RankingsNamePrice and More Details
Rockford Fosgate R600x5 5 Channel AmplifierClick Here
BOSS Audio Systems Elite PV3700Click Here
JL Audio XD700/5 5 Channel AmplifierClick Here
Planet Audio AC1800.5 Anarchy Car AmpsClick Here
Kenwood Excelon X802-5 5 Channel AmplifierClick Here

This article could provide you with some ideas if you’ve reached the maximum level of your car’s power system and wish to keep going. Here is a list of the best car audio capacitors that you can add to your car stereo:

#1 Planet Audio PC10F Car Audio Capacitor

Planet Audio PC10F Car Audio Capacitors

These amazing capacitors come with a LED voltage display that not only lets you know the current-voltage but also makes it easy to monitor if you are running low on energy. These caps are 10 farads and come with both voltage protection and surge protection.

When it comes to charging times, this one is fast, taking only 2-4 minutes to get a full charge. Another faboulus feature is that it comes with an automatic shut-off after 10 seconds of inactivity. The working voltage of this cap is 16 VDC, and the surge voltage is 24VDC.

With a high-quality cap like the Planet Audio PC10F, you can listen to your favorite tunes with clarity. These are specially made for car audio installation, so they have all of those special features that will keep power going consistent and stable.

It is designed with a reverse polarity warning tone, so you don’t have to worry about connecting it wrong. The rugged plastic casing is durable and protects the capacitor well. Plus, it protects you against both low voltage drops and voltage overload.

The downside of this cap is that it’s a bit larger than most other capacitors, which can be an issue for those who do not have lots of space available for installation. Also, it is not compatible with 0 gauge wire connections. Overall this is the best car audio capacitor on the market.

#2 Rockville RXC4D 4 Farad Car Capacitor

Rockville RXC4D Car Audio Capacitor

The Rockville RXC4D is a four Farad capacitor that has an IC control circuit that comes with a negative polarity feature, so you never have to worry about not knowing if there is an issue with your equipment.

Manufacturers included mounting brackets that are easy to install on any surface, and it is also simple to release the charging resistor in case of an emergency. The remote terminal screws are easy to connect to any car audio amplifier.

When it comes to charging time, this unit takes around 3 minutes maximum. So the charge is quick for this one. It counts with a 24-volt surge power capacity and a low voltage shutdown feature to ensure your battery doesn’t overheat.

With this Rockville capacitor, you can listen to incredibly clear sounds from any device that has been connected to your car audio system. It’s powerful enough for those who want those deep bass sounds but also keeps other devices running without any interruption.

It also has an illuminated three-digit voltage display that is very user-friendly and easy to read, even in low light situations. This is perfect if you like to charge your capacitor at night time or when it’s dark outside. By far the best car audio capacitors for the price.

#3 Sound Storm C22 Car Audio Capacitors

Sound Storm C22 Car Audio Capacitor

This Sound Storm capacitor is a 2 Farad capacitor that is perfect for those who want to run a single car audio amp. It has a nickel-plated finish and comes with a remote control so you can easily charge it without having to leave your seat.

It has a digital voltage display so you can always see how much power is left in the capacitor and blue light that will let you know it’s charging. It also has a protection circuit against over-voltage, over-current, and short circuits.

This unit is very small and lightweight, making it easy to transport from one car to another. It’s perfect for those who want great sound quality without having to sacrifice size or weight. You won’t need to spend any extra money on mounting supplies with this kit.

The mounting brackets and other items are included, so all you’ll need is only a few screws. Furthermore, It has an automatic safety cut-off feature, so you are always protected when it comes to your vehicle’s electrical system.

It is perfect for those systems that require high voltage. The terminals can work efficiently under higher levels of tension and has surge protection against damaging fluctuations in charge delivery. It is an amazing addition to your car’s audio system.

#4 BOSS Audio Systems Cap 18 Farad Capacitor

BOSS Audio Systems Cap 18 Capacitor

The Boss Audio cap produces an audible tone as a warning sign to let the users know if there is a possible voltage overload or a low battery situation. This capacitor charges fairly quickly and can be mounted on any surface.

More so, this unit is a good option for those who have various car audio amps, and it has a solid design that will hold up against the elements of heat during the summer and cold in the winter. It’s a fantastic choice for those who want to supply consistent power going to the car amplifier.

It counts with a three-light digital display that will indicate the level of charge, and it makes it easy to know when the device has a lower battery voltage. The car audio cap preserves the energy going to the amp, which can reduce the chances of dimming lights or car battery failure.

This capacitor is also a good choice for protecting the electrical system of your car. If there is an unexpected short in the wiring, this Boss Audio Cap will help to keep things from going too wrong. It’s a reliable option for those who want a durable and efficient capacitor.

With over 16VCD working voltage and 20VCD surge voltage, this cap has plenty of power and does not suffer from any heating issues. The device will keep your device running for hours on end. It has a low-profile design that allows you to easily mount it under the hood without taking too much space.

#5 Rockford RFC10HB 10 Digital Capacitor

Rockford RFC10HB 10 Cap

Adding a car capacitor to your sound system like the Rockford RFC10HB can allow you to store and release large amounts of power in a short amount of time. This unit is only 1.5 inches thick and 8.3 inches wide, which provides an easy fit underneath the hood of any vehicle.

It features a 3-digit LED display that makes it very easy to check on how much power is left in your capacitor, as well as an illuminated power button. The Rockford cap is also shock and vibration resistant, so you don’t have to worry about it breaking while on the go. Connectivity is simple due to special ring terminals.

This capacitor can handle up to 10 farads of maximum voltage and comes with a variety of different connectors to fit nearly any car audio system. It also has a built-in thermal protection circuit to help keep your device safe from overheating.

Overall it is a superb option for those who want an easy-to-use and reliable device. It’s perfect for anyone who wants to add more power to their car sound system without having to worry about the quality or safety of the product.

#6 Audiopipe ACAP-6000 6 Farad Digital Capacitor

Audiopipe ACAP-6000 Cap

The Audiopipe ACAP-6000 digital power capacitor has integrated amplifier protection to prevent any sort of damage that could occur with the electrical system of your car. It is also equipped with an overload indicator that will let you know if there’s a problem before it gets worse.

It is possible to check on how much power remains in this capacitor via its three-digit LED digital display, which can be seen without having to open any extra compartments. The mounting hardware is attached to the device itself, so you won’t have to worry about it.

The cap has a fast-charging capacity. When it reaches full charge, the voltage will stop rising. After reaching its peak value within minutes of connecting the device, it will keep the voltage at a steady level. The ACAP-6000 is also capable of withstanding high temperatures without any issues.

One of the best features is the status indicator that will tell you if the capacitor is malfunctioning or if it is running on a low battery. This will help to ensure that your car audio system stays safe and functional at all times.

It is an finest choice for those who want a digital power capacitor that is durable, easy to use, and comes with tons of features. The chrome-plated posts allow a safe and tight connection that can run to your car battery.

#7 Sound Storm C352 3.5 Car Audio Capacitor

Sound Storm C352 Cap

This power capacitor has an outstanding 3,500,000 microfarads capacitance. It is the perfect solution for those who want their car amplifier to have a steady supply of power.

It will keep the speakers alive and working without any issues so that you can enjoy an awesome sound experience every day. Features remote terminal screws for an easy and quick installation.

The 3.5 farad capacitor is made with aluminum foil, which improves the durability and lifespan of the product. It can handle a surge voltage of up to 24 volts, making it perfect for those who want a high-performing car audio capacitor.

It is also very compact, so you can install it in a variety of different places in your car. Provides the user with reverse polarity protection and an LED display to show the voltage range when it is in use. The chrome-plated posts are another great feature that makes it easy to connect the capacitor to your car battery.

Overall it is a great choice for those who want a reliable and affordable product to upgrade their car stereo. It’s perfect for anyone who wants to power up their car audio system without any problems.

#8 Power Acoustik PC1.5F Farad Capacitor

Power Acoustik PC1.5F Digital Capacitor

The Power Acoustik capacitor has a 1,500,000 microfarad capacitance. It is great for car audio systems that have an amplifier. It has brass-plated terminals, so you don’t have to worry about wiring connections every time you use your capacitor.

It can handle up to 24 volts of maximum voltage, making it perfect for anyone who wants to power their system with something that will keep the sound quality at a high standard. Considered one of the best options on the market right now due to its reliability and performance capabilities.

Other features include resistance, durability, flexibility, and weatherproof construction, which makes it easy to install in nearly any car. The LED voltage display is also a great addition that helps you to keep an eye on the power levels while you’re using your capacitor.

You won’t have to worry about any issues when using this device for regular listening experiences or other fun activities like long road trips with family and friends. By far the best car audio capacitor based on price and affordability.

#9 Stinger SPC5010 Pro Hybrid Capacitor

Stinger SPC505 Pro Hybrid Capacitor

The Stinger capacitor has a nice black design with an anodized aluminum housing that makes it look great and also helps to protect the cap’s from sudden impacts. With a surge voltage range of 16V to 18V, you can be sure that your audio system will stay safe when it is in use.

It has a 5,000,000 microfarad capacitance, making it the ideal choice for anyone who wants to keep their amps with a consistent supply of power no matter what kind of driving conditions they’re in. Also, it minimizes headlight dimming and keeps your stereo sounding clear at all times.

The brass-plated terminals are another nice feature that ensures you never have any issues with your wiring connections every time you use them. Another feature that users love is the four-segment red digital display that shows the voltage level of your power supply.

It is able to handle low voltage power surges that could potentially damage your system, so you can feel confident when using this device at all times. By far the best capacitor for anyone who wants a new capacitor to improve their car’s audio system.

#10 SoundBox SCAP2D Farad Digital Power Capacitor

SoundBox SCAP2D 2.5 F Capacitor

The SoundBOx car audio capacitor was designed with nickel-plated rust resisting posts to make it look great and also to add durability. It was manufactured with a case that is made from high-strength cylindrical aluminum material that is able to resist lots of heat.

Additionally, The housing finish also protects the capacitor from UV rays and other harmful elements that could damage it over time. It has a 2.5 farad capacitance that is perfect for those who want to improve the audio quality of their car audio system without any problems.

It has a 2,500,000 microfarad capacitance which offers you a great way for having fun during long road trips or for blasting your favorite songs in the car. According to SoundBox, this amplifier is best suited for audio systems with amps rated at 2,500 watts.

Experts love the clear mounting brackets that make it easy to install on any kind of vehicle. Another feature is the ground lug kit which helps to ensure a uniform electrical connection with your car’s chassis. It is the best car audio capacitor for those looking for more power and stability at the same time.

Best Car Audio Capacitors Buying Guide

The downside to a loud and bassy car audio system is that it can hinder other parts of your vehicle. However, nothing feels better than listening to your favorite tracks while cruising down the road.

Reverse polarity protection and an LED display of the voltage are two of the most crucial elements to look for while selecting a cap. High voltage and high-temperature ratings are also important factors to consider.

A great way to make sure that you always get the most out of your car audio system is to use an external amplifier. An amplifier with too much power can drain your battery, dim the lights on the car and strain its alternator. Here is where a capacitor comes into play.

What is a car audio capacitor?

A car audio capacitor is a device that stores power. It sends the stored power to your speakers when you turn on the stereo to make the music louder.

Car audio capacitors are powered by electricity, which comes from batteries in your car. The capacitor stores power so that it can be used later when you want to listen to music.

How does a car audio capacitor work?

A typical capacitor will have two conducting wires inside of an insulating material like plastic with regards to how far each respective current can travel through this particular medium without any significant resistance getting in its way.

How many farads do you need?

A farad is the unit of measurement for electric potential. Every 1,000 watts of peak power requires roughly one Farad.

Benefits of Using Car Audio Capacitors

You may notice that sometimes, especially in really loud scenes, the lights in your vehicle flicker. This is called “clipping,” and it’s a good idea to have a car audio capacitor so you can avoid this clipping problem.

Another benefit of caps is the reverse polarity protection that they offer. What this does is protect your car’s electrical system from short circuits that can be caused by incorrect speaker wiring.

It’s always a good idea to have a capacitor in your audio system, especially if you like to listen to music loudly. They can help you avoid problems like clipping and short circuits while also ensuring that your system sounds its best.

The digital voltage display can also be helpful, as it will let you know how much power your capacitor is currently storing. This can be especially useful if you’re trying to figure out how much power your system needs in order to produce the best sound.

Different Types of Capacitors For Car Audio

Here are the three main types of capacitors:


Hybrid capacitors are an expensive and bulky alternative to others, but they may provide better performance in some cases. They are usually made using electrolytic technology. A hybrid capacitor is better than other capacitors because it has more power and more modern technology.


The polarities of carbon car capacitors are the polar opposition to those of electrolytic capacitors. In other words, the positive electrode of an electrolytic capacitor is the negative electrode of a carbon capacitor and vice versa.

The plates of a carbon capacitor are also pure carbon. The electrolytic caps can hold much more power than an early solid-state one and will therefore have a greater impact on your system’s overall efficiency.


Electrolytic capacitors are the most readily available variety of capacitors that are used for car audio applications. They can be useful in high-performance installations, but they tend to have some major disadvantages.

Their size is usually even larger than other types. It’s also important to note that their maximum operating temperatures are not as good as the other varieties on this list. Due to their size, they are most likely to come with one or two plug-ins.


How do I choose a car audio capacitor?

For every 1,000 watts RMS of total system power, add one Farad of capacitance. However, there is no penalty for using higher value caps. The greater the cap, the more charge is available to the car amp when it requires it.

A larger capacitor might be a better option for those who want an even longer lasting and more durable cap. Most likely, the amount of watts that the car amp has is going to determine how many Farads you need.

Are capacitors worth it for car audio?

Capacitors can help protect your car from potentially damaging under-voltage surges. When you play loud music regularly, the reason for adding capacitors may be to keep voltage stable and prevent car speakers from getting blown out.

What size capacitor do I need for a 2000 watt amp?

Going by the rule of thumb, you will need a minimum of 2 Farad of capacitance for a 2,000 watts RMS amplifier. This, however, is just a general guideline, and you might need more or less capacitance based on the specific amplifier that you are using.


Now that you know a little bit more about capacitors, it’s time to go out there and make your system even more awesome. Look for capacitors that have Equivalent Series Resistance (ESR), and reverse polarity technology. They are known to have fewer power losses than other models.

Choosing the best car audio capacitor for your need is going to be a breeze now. Features like reverse polarity and mounting brackets should be on top of your list before making a final decision.

Last Updated on: June 13, 2023

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