What Size Fuse For 2000 Watt Amp

Regarding car audio systems, the fuse is the unsung hero often overlooked. Yet, it plays a crucial role in protecting your equipment from damage due to overcurrents.

For those wielding a powerful 2000 watt amplifier, selecting the correct fuse size is not just a matter of performance—it’s a safeguard for your investment. This article delves into the intricacies of choosing the right fuse for your amp, ensuring that your audio system delivers its full potential without the risk of electrical mishaps.

Understanding Amplifier Power

A 2000-watt amplifier is a powerhouse capable of delivering a thunderous audio experience. But with great power comes great responsibility—understanding how such power impacts electrical demands.

Amplifier power is measured in watts, a product of voltage and current. This measurement is pivotal in determining the correct fuse size, as it dictates the current flowing through the amplifier’s circuits.

amplifier on the floor

The Role of Fuses in Amplifiers

A fuse is a protective device that interrupts the power supply when the electrical current exceeds a certain level, preventing damage to components or wiring. In the context of an amplifier, a fuse is the first line of defense against potential overloads that could fry your system. 

Without a properly sized fuse, you’re not just risking your amp, but you could also be flirting with a fire hazard.

Factors Affecting Fuse Size Selection

Choosing the right fuse for a 2000-watt amp is more complex than picking a number. The amp’s current draw, calculated from the power rating and efficiency, would be best.

Additionally, the wire gauge used in the installation can affect the amount of current carried to the amp, thus influencing the fuse size. Lastly, always check the manufacturer’s recommendations, as they have tested their equipment to specify the safest fuse size.

Calculating the Correct Fuse Size

The general rule for fuse sizing is to divide the amplifier’s power (in watts) by the voltage your car’s electrical system provides—usually 12 volts for most vehicles. For a 2000-watt amp, the calculation would be 2000 watts / 12 volts = 166.67 amperes.

Considering efficiency and other factors, you might round this up to the nearest available fuse size. However, always refer to your amp’s manual for specific instructions.

Types of Fuses

There are several types of fuses, including glass tube fuses, blade fuses, and ANL fuses, each with advantages. ANL fuses are often recommended for high-powered systems like a 2000-watt amp because they can handle high currents without blowing unnecessarily.

Installation Tips

Installing a fuse for a 2000-watt amp requires precision. Ensure the fuse is installed close to the battery to protect the entire circuit.

Use the correct wire gauge to prevent overheating and potential fire risks. If you need more confidence in your electrical skills, seeking professional installation is wise.

fuse and potential fire risk


If your fuse blows, it’s a sign that something is amiss. It could indicate an overloaded circuit, a short circuit, or an issue with the amplifier. Before replacing the fuse, diagnose the underlying problem to prevent future occurrences.

Legal and Warranty Considerations

Modifying your car’s electrical system can have legal implications and affect your vehicle’s warranty. Using the wrong fuse size could void warranties on your audio equipment, so it’s important to adhere to specifications.

Can using a fuse with a higher rating than recommended actually harm my 2000 watt amplifier, and if so, how?

Yes, using a fuse with a higher rating than recommended can harm your 2000-watt amplifier. While it might seem counterintuitive, a fuse rated too high won’t provide the necessary protection.

Here’s why:

Fuses are designed to blow or break when the current flowing through them exceeds a specific threshold. This safety feature prevents excessive current from reaching and potentially damaging sensitive electronic components like those in your amplifier.

If you use a fuse with a higher rating than recommended for your 2000-watt amp, it won’t blow as quickly as it should in the event of an electrical fault or overload. This delay in response time allows an excessive current to flow through the amplifier for a longer period, leading to overheating, component damage, or even a fire.

In simpler terms, think of a fuse as a guard. If the guard is too lenient (a higher-rated fuse), it may fail to stop an intruder (excess current) in time to prevent damage to your valuable equipment (the amplifier). Therefore, always use the fuse size that matches the manufacturer’s specifications for your amplifier to ensure optimal protection and performance.


Selecting the right fuse for a 2000 watt amp is critical for safety and functionality. By understanding the electrical demands of your amplifier and adhering to the guidelines provided, you can enjoy your audio system with peace of mind, knowing that it’s protected against electrical mishaps.

Frequently Asked Questions

What if my amp doesn’t specify a fuse size?

Consult with a professional or the amp manufacturer for advice.

Can I use a higher rated fuse for better protection?

Using a higher-rated fuse can be just as dangerous as using one that’s too low. It’s best to use the size recommended by the manufacturer.

Alex Klein Author


Alex Klein is an electrical engineer with more than 15 years of expertise. He is the host of the Electro University YouTube channel, which has thousands of subscribers.