How to Choose the Best Car Amplifier: 7 Things to Consider

This article covers 7 different things on how to choose the best car amplifier that will boost your audio experience.

  1. Pricing

It is very intriguing to buy the 2000 watt amplifier for $ 199. You can argue that getting a 2000- watt amp for that price is a bargain, but you should check the fuses before you deposit your funds. It’s simple physics. Power = voltage X energy consumption X efficiency constant. The average voltage of the car can be around 13.5 volts. Power consumption is the total fuse level for the amp, and the efficiency constant is about 0.6 for class AB and 0. 8 for class D amplifiers.

Let’s assume the amplifier has fused at 50 amps and is Class AB. Simple math says it will give 13.5 x 50 x 0.6 watts. So, about 405 watts. This is about the best that a 50 amp fused AB amplifier can produce.

Typically, you will find that high-quality amplifiers advertise a more accurate rating. Check the fuse and calculate to ensure you’re getting what you’re paying for.

  1. Amplifier Warranty

Another point on how to choose the best car amplifier that is worth consideration is the amp warranty. Get a warranty on your amplifier! Many manufacturers do not offer a warranty unless the amplifier has been purchased from an authorized dealer. While this may not seem fair at first glance, you should think about this: the manufacturer is committed to building a supply chain they can trust. When their products are sold by one of their retailer or dealers, they know where the product was from the moment they leave the factory. If sold by an unauthorized reseller, the manufacturer may not know where the product was or what may have been done with it. How could they guarantee something they couldn’t control?

Before purchasing an amplifier, make sure that the seller in question is genuinely licensed. If you can’t find them at the manufacturer’s dealer, find your phone and call the company. If they aren’t allowed, you should really think twice before you buy.

  1. Physical Size of the Amplifier

Make sure the amplifier is suitable ad it will fit! Please don’t buy a big amplifier and expect it to fit under your car seat. The technology has worked well over the past decade and there are many small (even tiny!) amplifiers that produce very good clean output. Don’t be fooled by a small amplifier. Many good amplifiers come in small packages. Ensure it fits where you want it!


  1. Cable for Amplifier

Buy good cables for your amplifier! Don’t be fooled by the “too good to be true” amp cable kit listings. Oxygen-free copper (OFC) is king! The price of copper has increased through the roof, and therefore the quality in price rates have increased.

Look for CCA (Copper Clad Aluminum) kits. These kits consist of an aluminum conductor center and a copper outer ring. Copper is a better conductor of electricity than aluminum. In some cases, a 4-gauge CCA cable carries less current than an 8-gauge OFC kit.

After all, there’s a huge difference in the “size” of the wire. A decade a go, 4 gauge was 4 gauge. It was a little thicker than a sharp point and the coating thickness was consistent. Nowadays, you have to be careful. Many kits made in China have very thick coatings and very little wire! A 4 gauge set sometimes has less threads than a “real” 8 gauge set. Buyers are warned!

  1. Amplifier Function

When choosing the best car amplifier, ensure your amplifier is doing what you need to do. Does it have high inlets to connect directly to your factory deck? Is there a subsonic filter for your ported subwoofer app? Is it stable at the desired ohmic load? Look for an amp that can answer all of these questions and many more.

  1. Amplifier Intended Use

It’s essential. Make sure the amplifier is compatible with the ohm load you are connecting it to. If you overload your amplifier, it will crash. Do not buy a monoblock amplifier (1 channel) for a 2 or 4 channel application. Make sure the amplifier has crossovers that fit the application you need.

Purchase A More Powerful Amplifier Than You Need

Let’s say you buy a 2000-watt amplifier. We have shown that the maximum power is 405 watts. You connect this with your sub box and it disappoints. What do you do? Of course, you increase the gain control! Bad move! The gain is used to match the output of your deck to the input of the amplifier. It has nothing to do with the subwoofers or speakers the amplifier is connected to. There is only one correct setting, which is determined by the deck and not by the speakers or subwoofers. As you increase the gain, you create clipping. Simply put, clipping kills speakers. Since the amplifier was not producing enough power, you artificially tried to increase the power.

Buy more power than your speakers need. You can keep your gains at the right setting. This improves sound and reduces the risk of damaging your amplifiers.


Thousands of amplifiers are available for sale today. Some are of good quality, and some are not. Use better judgment and the guidelines above, and you will get quality sound that will last a long time. If it sounds too good to be true, it probably is. If you follow these tips on how to choose the best car amplifier, you’ll enjoy every moment of your everyday commute!

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