8 Best Subwoofer Amps in 2021

This week, we're looking for a good mono-block alternative to award those who like their loud audio and bass the title of best subwoofer amp.

If you are looking to install a subwoofer, particularly if it is in your car, you will need an amplifier that has a dedicated subwoofer connection. For the configuration of a single subwoofer speaker, that, or a mono subwoofer alternative that sends a single-channel signal, is enough.

Most of the factory stock amplifiers in cars are made for radio use and hands-free calling. They can offer a high-output upgrade, but without the necessary connections, most don't allow for a subwoofer as a daily fare.

View The Best Subwoofer Amp Below

1. RIOT 1100 Watts, Mosfet

Our opening concept is from Boss' engineers, who know a thing or two about car speakers and audio as they make some of the best-selling prototypes on the market for car audio speakers.

A single-channel mono subwoofer option designed specifically to feed your subwoofer is the Riot model amplifier. It's a high-output option that can give your sub-bass speaker 1100 watts of peak power at 2 ohms.

Alternatively, it can also have a peak power level of 550 watts at 4 Ohms, making it a flexible choice for your car in terms of application.

A class A/B subwoofer amplifier, which is well built with a simple layout, is easy to mount in your car. It is fitted with a button for bass boost and a knob for low pass frequency. For optimum audio quality, you can tailor the bass a little and guarantee that no high-frequency notes are sent to your sub.

It has a sturdy and lightweight design with a height of 2.3-inches, measuring 9.1-inches by 10.4-inches. It benefits from a power supply from MOSFET that holds it optimal for production of high performance. With a circuitry modification, it is safe against shorting and has a variable input level power, making it ideal for your vehicle.


+ 1 high and 1 low channel for output.
+ Filter for low pass crossover.
+ Input regulation of variables.

Why We Liked It

It is well-built, easy to mount in your vehicle, and offers 2 separate single-channel choices. It caters to subwoofers with low impedance or high impedance. For those who like to feel the bass, the boost button is a nice touch, particularly better when they're driving in their car.

2. Pioneer GM-D8601 class D

Next up is a top-notch choice for its higher-caliber output, with a fair price-tag. The GM-D8601 is a class D amplifier that surpasses the market's A/B groups.

This mono subwoofer amplifier can pump out a maximum power output of 1,600 Watts over a secure 1 Ohm link.

For installation versatility, this class D amplifier has recently been upgraded with a new compact enclosure and has seen a circuitry redesign for optimization.

To prevent the amplifier from shorting out, it is fitted with dual 40 amp ATO fuses, and it has versatile connectivity. There are 8-inch speaker-level inputs, so your OEM unit can be directly connected to it. With an RJ-25 plug on either end, it has a 19-inch remote cable, so you have a lot of versatility in terms of where to stick it.

Via its low-pass filter that adjusts from 40Hz to 240 Hz, the wired Bass Boost remote gives users the ability to use its variable bass power. This allows the low-end sound to be customized to your personal preference.


+ Output-high.
+ Amplifier Class D.
+ Improvement of variable bass.
+ Safety of circuits.

Why We Liked It 

With versatile installation options, it is a well-engineered Class D amplifier. The upgraded circuitry is super-efficient, offering a massive amount of peak power.

3. Rockford Fosgate R500X1D

Without considering the Rockford Fosgate model, we couldn't talk about car subwoofers, so here it is the R500X1D Prime.

The Rockford Fosgate is a lightweight, inexpensive Class D model that has been robust and well-engineered to serve a 500 watt peak RMS at 2 Ohms impedance or 300 watts at 4 Ohms.

It is powered by Mosfet and has a solid heat-sink of cast aluminum to avoid over-heating. To ensure over-current security and short protection, this works hand in hand with its thermal sensing circuitry - this keeps the Rockford Fosgate amplifier impeccably efficient.

This versatility across single channels makes it possible to suit a broader variety of users. It has a top-mounted easy-reach control panel that allows you to attenuate your low-end frequency pass from 50-250 Hz, adjust your input gain and change your phase grade from 0 to 180. It also benefits from a Butterworth crossover of 12 dB/octave.

This subwoofer amplifier has a remote bass control/punch level control, like the model above, so you can shape your bass characteristics according to your preference. One of our favorite features is that it mutes upon start-up, so you don't risk blowing a speaker upon power-up if you have left the volume at full outputs.

This amplifier's relation is 4-gauge and well-grounded. It is designed to last and is easy to mount.


+ Well-engineered - up to 500 watts of electricity.
+ Power of the punch speed.
+ 2 or 4 options for Ohms.

Why We Liked It -

With some welcome circuitry decisions that make it an effective little beast, it is a well-built mono-block choice. Lots of power - 500 watts of power.

4. Alpine MRV-M500

Now, for a great alternative that competes with the best of them, go to another leading industry leader, Alpine.

This amplifier is competitively priced and shares much of the above specifications, offering a run for its cash to the Rockford Fosgate. At 2 Ohms, or 300 watts at 4 Ohms, it has a 500-watt peak RMS channel.

It has also recently been upgraded to a platform in the D class with a 40 percent smaller chassis. To prevent overheating and shorting, the circuitry is well-designed. To enable a super-simple install, it now has a new snap-on terminal cover.

This subwoofer amplifier has speaker-level inputs that do not need a remote cable, as the amplifier has a Line Output Converter (LOC) built-in and can automatically detect the voltage required.


+ 500w @2/300w @ 4 500w @2/300w @ 4
+ Amplification of class D.
+ Priced competitively.

Why We Liked It - It's well-made and super-compact. This offers a flexible solution that will accommodate the majority of needs. It's not the most powerful subwoofer amplifier on the market, but they have a lot of warmth in their tones, and that's a big factor in our books.

5. Rockville 4000 Watt

The 4000 Watt model from Rockville is a fantastic high-output solution that gives a true rumble to your subwoofer amplifier.

It's another alternative operated by Mosfet with a compact enclosure. This subwoofer amplifier is a high-performance model with an impedance of 2 Ohms or 1200 peak RMS over a 4 Ohm line that provides up to 2000 watts over a single tube.

It's a well-engineered D-class amplifier with optical couplers of high quality. With under-voltage protection set at 10-volts and over-voltage protection at 16-volts, it has full IC-controlled protective circuitry.

Despite its high-power design, this amplifier is made with a robust chassis and is CEA compliant and rated with less than 1 percent distortion.

It has a fully adjustable 12 dB/octave Crossover, a phase control switch, and a low-pass filter with a patented subsonic filter that adjusts between 15Hz-55Hz ranging from 50Hz-250Hz.

A remote dash mounter subwoofer bass control is included with the subwoofer amplifier that allows you to change the equalization to your liking. You can also mute it, and to avoid blowing your speakers, it profits from the Delay Soft Start System of the firms, making this the best subwoofer amplifier for those who unintentionally leave their audio too high.

It comes with a comprehensive manual and, including the screws, all the necessary mounting accessories.


+ High-energy.
+ Crossover and subsonic customizable filter.
+ Bass equalizer dashboard with mute feature remote.
+ Safety of circuits and a delayed soft-start system.

Why We Liked It -It is extremely efficient and benefits from advanced engineering. It allows it to dish-out enormous quantities of electricity. Yet it does not have high-powered sets aligned with the usual troublesome circuitry draw-backs.

6. MTX Audio TNP212D2

Next, we picked a pair of subwoofer amplifiers that could save some of the hassles of separately locating compatible options, producing a complete audio setup. The TNP212D2 is a dual subwoofer for trunk mounting that comes with the correct amplifier for the job. Hot off the Terminator series line from MTX audio.

Let's address the subs themselves first. They are a well-manufactured pair of 12-inch speakers, made from medium-density fiberboard and carpeted with a hardy sealed enclosure.

The components of the driver are effective, and the cones are sufficiently rigid and flexible to deal with sub-bass frequencies. They each handle RMS peak power of 200 watts, totaling 400 max for both of them.

The amplifier does just that; it has a variable high and low-level crossover for equalization and can also be linked to your normal, middle of the road radio speakers, making it good for the vehicle.


+ Dual package of subwoofer and amplifier.
+ 400-watt peak power for RMS.
+ Simple installation.

Why We Liked It - They are permanently made and may well be the easiest and safest option without the experience and know-how of sourcing their set-up for those looking for a bit of extra bass description.

7. Ignite Audio Mono Block

Next up, we have an inexpensive no-frills solution that keeps installation and operation easy.

It's another Class D high-quality amplifier that's capable of very high performance, close to the Rockville that we've already noticed.

It is a 4000 Watts Peak Capacity subwoofer amplifier with 1 Ohm power handling of 750 Watts, 2 Ohm power handling of 530 Watts, and 4 Ohm power handling of 530 Watts or 300 Watts.

It has a high performance, solid design and comes with a sleek dash-mount remote that simply has a volume dial. As it is maximized for excellent audio, this attenuates the bass levels. When deciding where to put it in your car, this amplifier has compact dimensions that give you more wiggle room.

Well-engineered with integrated circuitry, this amplifier creates good power and clear sound quality. It benefits from advanced characteristics of over-heating that keep it reliable. It has a great ratio of signal to noise and great sensitivity that allows low-level inputs to be amplified well.


+ Well-builded.
+ D Amplifier in class.
+ Circuitry optimized.
+ Sensitivity at low levels.

Why We Liked It -With stable circuitry and efficient performance, it is another competitively priced high-output power amplifier option to consider. It has lightweight dimensions for your vehicle as well.

8. Sound Storm LOPRO10 Amplified

As a car amplifier, our last selection is something a bit different and a fantastic solution where something that caters to a smaller space is needed. Sound Storm's LOPRO10 is a slim-fit subwoofer that offers one of the simplest installations out there with its own built-in amplifier.

To boost its performance, it has a Mosfet power supply by lowering its gate-to-drain feedback capacitance and speeding up its switching capabilities.

It is well-made, with a 12-inch speaker driver that provides a great response to the subwoofer. To help guide the correct frequencies to your sub and produce excellent car audio, it is equipped with a low-pass filter.

It has high-level inputs as well as low-level inputs (RCA) for non-traditional RCA speakers and can attach directly to your factory-installed radio.

It has a variable boost so that your bass EQ can be molded again until you are satisfied.


+ Sub for outstanding car audio with a built-in amplifier.
+ Inputs at high/low levels.
+ Improvement of variable bass.

Why We Liked It - This is a simple sub-solution that has within its confines a dedicated amp, saving plenty of room and delivering excellent audio and power for the car.

Subwoofer Amp Buyers Guide

It can be hard to source amplifiers because many of us are uncertain when it comes to setup and impedance. Attach a whole lot of obscure jargon to that and you find yourself way over your head easily.

We are diving into speaker amplifier terms to clear things up. This should help you to read and find precisely what you need through the marketing spiel.

What Does Mosfet Power Supply Mean?

Mosfet is an acronym for Field-Effect Transistor of Metal Oxide Semiconductor, which is what a Mosfet power supply uses to perform. This gives it the opportunity to deal with the wavering between full-conduction and non-conduction, eventually giving it better power and quality of production.

The power configuration is similar to a 'V' shape and is often referred to as a V-set or V-Mosfet as well. In the 1970's, they first came into commercial use and have a few benefits.

They run faster, with more power, and their frequency of transit is higher. This implies that they require a simplified form of defense against short circuits and are less likely to break down or fall victim to secondary problems.

They manage higher transient currents better without a Beta drop (the greatest cause of current drainage distortion) and rely on much smaller driver transistors to work. This implies that within smaller applications they can be used. They also shut off appliances more easily, eliminating crossover distortion.

What Does RMS Mean?

RMS stands for route mean square, a statistical approximation of the mean of a series of square numbers (the average found by dividing the sum of numbers by the total number of terms).

Simply put, for the loudest part of a song, this defines the maximum peak amount of output power that an amplifier can achieve in a single split-second. This does not apply to the constant maximum output power, which is normally much lower.

Amplifier Classes

You may have noticed that amplifiers are graded with one or two letters, but you may be shocked to know that in alphabetical order, this does not define them as best to worst or vice versa.

This is because they're not a grading system in fact. Instead, the letters refer to how powerful their wave functionality is.

All amplifiers work through wave-forms. A Class A amplifier performs a wave-form at 360 degrees. This means that, as distortion levels are decreased, they are less likely to have a background hum in a single-ended design. They function in a push/pull way, with the positive and negative portions of a wave cycle shared by 2 outputs.

Essentially, an A-class amplifier needs a continuously flowing high-level current even when there is no output power in the process. This gives you audio quality, which is why people with an understanding of audio quality always rave about them, but this unfortunately means they have to act at all times.

Continuous conduct contributes to vast quantities of wasted energy that is converted into heat. The build-up can cause problems with over-heating. In contrast, the circuitry for an A-class amplifier often includes a much larger chassis.

A B class amp has the same single-ended push/pull feature, but it means that only half of the devices that cover one 180-degree portion of the 360-degree wave are running at any given time.

This is more effective and less waste, but the two amplifiers produce a nominal delay.

This is why on the market we see more class A/B models, which basically offer a blend of both techniques and improve the productivity a little more.

As they are unrelated to this specific post, there are also G and H class speakers that we will skip over.

D-Class amplifiers are the most powerful and, thus, arguably the best on the market. This is because the devices linked between a on and off state will rapidly fluctuate. Getting the ability to idle makes it possible to optimally make maximum use of power consumption.

Thanks to their design requirements, they can have much higher outputs and are less vulnerable to over-heating problems as well. In a much smaller enclosure, they can also be contained, making them a lightweight option and allowing you more flexibility and independence about where to mount them in your vehicle.


Without the right amplifier for the job, a subwoofer can not be mounted, a single-channel mono-block addition is a sensible option and, luckily, there is an abundance of capable models to choose from.

It can be tricky to find the right amplifier for your subwoofer if you're not down with the lingo, we hope our guide will have shed some light on the issue, albeit heavily technical. And hopefully, you'll find yourself with the right audio setup.

You can search the web for any DIY installation guide videos if you are unsure and, if necessary, enlist a professional to do it for you, ensuring that you get the best audio device.

We have selected a good variety of choices to accommodate a range of needs and trust that with our broad selection we will have covered all of our bases. We are sure that we have found some of the best available and wish you the right power-head for the job.

Expert Tip

Through its brand spanking new subwoofer, never judge an amplifier. A subwoofer actually requires 3-4 hours of usage for a break-in time. You can check out our car subwoofer articles for inspiration if you are also looking for a subwoofer.

Did you Know

Some people assume that the D amplifiers in D Class stand for digital, but this is nothing more than a misnomer, in reality it was only technically the next letter available because amplifiers that are not made for audio use have already taken and used C class.