The 8 Best Under Seat Car Subwoofers of 2021

Jerry Wilson
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If you’re looking for an affordable, compact upgrade that will improve your car’s audio system and transform it into a formidable machine worthy of any neighborhood bass music competition. Then you need to consider an under seat car subwoofer.

Although under seat subwoofers can be a great addition to your car, they come with an array of options and features. Because of that, it’s important to know exactly what to look for before you decide to buy one.

That’s why I’ve compiled a list of the best under seat car subwoofers on the market today. These are the subwoofers that offer superior bass quality, the most value for your money, and bang for your buck.

Don’t miss out on your chance to take your car audio sound system to the next level!

Here are the best under seat car subwoofers currently on the market.

NameCategoryProduct
Rockville SS8P 400w 8" Slim Under-Seat Active Powered Car/Truck Subwoofer SubBest OverallRockville SS8P 400w 8" Slim Under-Seat Active Powered Car/Truck Subwoofer Sub
Kenwood KSC-PSW8 250W MaxBudget PickKenwood KSC-PSW8 250W Max
Rockford Fosgate PS-8 Punch Single 8" Amplified Loaded Enclosure SubwooferUpgrade PickRockford Fosgate PS-8 Punch Single 8" Amplified Loaded Enclosure Subwoofer

1. Rockville SS8P 400w 8" Slim Under-Seat Active Powered Car/Truck Subwoofer Sub

Our rating: 9 / 10

Rockville SS8P 400w 8" Slim Under-Seat Active Powered Car/Truck Subwoofer Sub

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Pros:

  • Slim Profile
  • Strong magnet system
  • Low Noise

Cons:

  • Inferior build quality
  • Bigger than advertised
  • Frequent component failures

The Rockville SS8P is the cheapest underseat subwoofer that we have reviewed, but it still has the clear ability to shake the foundation of a car. It’s especially good for those who don’t have underseat subwoofer space for a larger model.

With a slim profile, it’s easy to slide under any seat for a fast and easy installation.

One of the main issues I had with this subwoofer set was that it was bigger than I thought. It requires a larger space than a standard seat. However, it’s still nowhere near as large as the 12" version.

2. Rockville RW10CA 10" 800 Watt Slim Low Profile Active Powered Car Subwoofer Sub

Our rating: 9 / 10

Rockville RW10CA 10" 800 Watt Slim Low Profile Active Powered Car Subwoofer Sub

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Pros:

  • Great bass
  • Onboard controls
  • Easy installation

Cons:

  • Relatively heavy
  • Somewhat bulky

The all-new Rockville RW10CA 10" 800 Watt Slim Subwoofer is a perfect choice for upgrading your car’s sound system without any compromises. It is well-worth the affordable price tag.

The slim profile of this subwoofer allows for simple installation due to its lightweight and compact size. The slim and sleek design of the subwoofer makes it a perfect fit for your vehicle, making it easy to install almost anywhere in your car.

This powerful subwoofer produces some of the most durable and clear bass in a car environment. You can feel the deep hard-hitting bass through the woofer cone.

3. Kicker 11HS8 8" 150W Hideaway Car Audio Powered Subwoofer Sub Enclosure HS8

Our rating: 8 / 10

Kicker 11HS8 8" 150W Hideaway Car Audio Powered Subwoofer Sub Enclosure HS8

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Pros:

  • 180 watts RMS
  • 8-inch subwoofer
  • 10" x 8" x 5" enclosure
  • Takes up very little space
  • Easy to install
  • Round edges
  • Works great with the Hideaway Amplifier

Cons:

  • A few say the sub did not work after 24 hours
  • Some say the subs did not last long

The Kicker 11HS8 powered subwoofer delivers sound from your speakers while you're listening to music and watching movies. The subwoofer is portable and connects to an amplifier. The large surface area provides optimum bass accuracy. The polypropylene cone won't break if you drop the subwoofer. The subwoofer's reputation for durability will last longer than any other subwoofer you've owned. The subwoofer has a waterproof non-resonant poly enclosure that eliminates sound distortion. Get the hidden subwoofer that your car system needs to sound great. Improve your car's sound system with the beautiful acoustic performance of the Kicker 11HS8 powered subwoofer.

4. BassPro SL

Our rating: 7 / 10

BassPro SL

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Pros:

  • 125 RMS watts
  • Bi Amp Ready
  • Built-in Wired Remote
  • Massive 8" JBL Subwoofer
  • Easy to Install
  • Check Price

The BassPro SL is a compact, XLR three-way powered subwoofer system. It’s engineered to fit under the driver seat of any car. It’s definitely the best subwoofer for the money!

The slim wooden enclosure has 8" JBL subwoofer attached to a built-in Wired Remote Control with…controls. It’s built to fit into virtually any car and offers premium, rich sound – deep, clean bass!

The BassPro SL has a Power rating of up to 125 Watts continuous power, 250 Watts peak. The Subwoofer shakes the world through low-frequency bass that’s powerful yet accurate and clear.

5. Kenwood KSC-PSW8 250W Max

Our rating: 7 / 10

Kenwood KSC-PSW8 250W Max

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If you’re looking for an under seat car subwoofer to replace a loud rumbly subwoofer you’ve been rocking, the Kenwood KSC-PSW8 is a great choice. It’s got a maximum output of 250 watts and an RMS output of 150 watts – plenty of power for most listening situations.

It’s an 8" subwoofer with a single 4 ohm voice coil, and you can easily adjust the volume to match your personal preferences. Although it comes with cables, they’re nothing amazing, and the fact that they’re not designed specifically for cars make them difficult to install.

6. Rockford Fosgate PS-8 Punch Single 8" Amplified Loaded Enclosure Subwoofer

Our rating: 7 / 10

Rockford Fosgate PS-8 Punch Single 8" Amplified Loaded Enclosure Subwoofer

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Pros:

  • Very loud
  • Can play at very high sound levels
  • Super cheap…
  • Easy installation

Unlike a lot of expensive subwoofers, this is probably the easiest and cheapest subwoofer anyone can install.

The set up is very simple and easy even if you are an amateur.

It easily attaches to the floor of your vehicle.

7. Rockville USS10 10" 800w Slim Under-Seat Active Powered Car/Truck Subwoofer Sub

Our rating: 7 / 10

Rockville USS10 10" 800w Slim Under-Seat Active Powered Car/Truck Subwoofer Sub

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Pros:

  • Easy setup
  • Affordable

The Rockville USS10 10" 800w Slim Under-Seat Active Powered Car/Truck Subwoofer Sub Box is my top pick when it comes to the car subwoofers of the year. This one is the perfect addition to your car, truck or any other vehicle.

It comes with a High-Excursion Composite Cone with butyl rubber surround that allows for tight, accurate bass. Another feature of this subwoofer is the top-loading chamber that reduce resonance for additional high definition output.

This bass subwoofer also uses the 100 watt RMS digital Class D output amplifier with 3-Band Precision Bass EQ that allows you to adjust your bass level.

8. Rockville RW10CA 10" 800 Watt Under-Seat Slim Amplified Car Subwoofer +Wire Kit

Our rating: 6 / 10

Rockville RW10CA 10" 800 Watt Under-Seat Slim Amplified Car Subwoofer +Wire Kit

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Pros:

  • 10” under-seat car subwoofer
  • 1,200 watts of power output
  • 400 watts RMS
  • 2 x 4” full-range speakers
  • 4-gauge cables for high-amperage
  • Two built-in 8-inch speakers
  • 400 watts RMS
  • Adjustable volume control
  • Built-in 40-watt bi-amp circuitry
  • Built-in crossover network

9. Kenwood KSC-SW11 Compact Powered Enclosed Subwoofer

Our rating: 6 / 10

Kenwood KSC-SW11 Compact Powered Enclosed Subwoofer

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Pros:

  • Powerful Sound
  • Easy Installation
  • Lifetime Warranty
  • Small, Compact Design

This little guy will improve the quality of your sound system significantly. Kenwood has packed plenty of power into this subwoofer to make the bass sound fantastic.

The REL T-20 is similar to the KSC-SW11, but it has a different enclosure and more power.

10. Rockville USS8 8" 600w Slim Under-Seat Active Powered Car/Truck Subwoofer Sub

Our rating: 5 / 10

Rockville USS8 8" 600w Slim Under-Seat Active Powered Car/Truck Subwoofer Sub

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Pros:

  • Very loud
  • Clear sound and plenty of bass
  • Easy installation
  • Affordable price

The USS8 is an active underseat car woofer designed to deliver massive sound and bass, giving you an exhilarating driving experience. The Rockville USS8 comes with a very slim profile and is designed to fit under most seats of cars, even on trucks.

It puts out 400 watts RMS power and 600 watts peak power that will make you hear the rumbling sound and bass, thanks to the passive under-seat design. The Rockville USS8 underseat subwoofer can be adjusted quickly thanks to its bass control knob.

The polypropylene 12-inch woofer in this car subwoofer is lightweight and can be placed easily under your car seat. This underseat car woofer has a 50Hz to 180Hz frequency range that covers the whole audio spectrum.

Frequently Asked Questions (FAQ)

What is the best under seat subwoofer?

The Alpine PDX-F4 1000W Car Subwoofer is loaded with a lot of goodies that make your life easier. For starters, this 1000W amplifier with dual voice coils has power to spare for situations that require it. In addition, the RCA level controls let you guarantee your sound stays as loud as you want it to be. You also get not one, but 16 different under seat subwoofer mounting locations that you can use for stable mounting.

Just about every part of the PDX-F4 is designed to help you enjoy your music without any issues, frustrations, or hassles. You’ll enjoy powerful opportunities for you to personalize your sound with the level controls and the adjustable crossover setup. You also get a remote bass controls where you can adjust the bass response from your driver’s seat.

Are underseat subwoofers any good?

To get the best bass, you want to put your subwoofer near an exterior wall of the car. Yes, any wall will do. The exterior of the car is a better option than the interior.

Keep in mind that to get the best system, you’ll want to either build your own subwoofer box, or buy a custom one. Building an existing box into your car probably won’t be enough for optimal sound.

If you’re looking for battery powered or super easy installation, then get a powered subwoofer. Powered subs come either built into your head-unit, which is at least as easy as a regular stereo, or they’re wired right into your car’s existing electrical system.

How do you fix a subwoofer under a seat?

The subwoofer is mounted under the rear passenger seat. The drivers side has a foam divider that prevents the subwoofer from bouncing against the back of the seat. The rear seats can be folded down to access the subwoofer. The easiest access is through the rear side door. Using a trim removal tool, carefully pry up and remove the small black trim piece directly in line with the subwoofer. Once this piece is out, the subwoofer can be lifted straight up and out of the vehicle. The small metal tabs that secure the subwoofer to the floor are pried up, and the subwoofer is lifted free.

How do you install a subwoofer under a seat?

What is the best 8 inch car subwoofer?

There are several of the best car subwoofer models on the market, but one of the absolute top 8 contenders is the Rockford Fosgate P3D2-12 Punch P3 DVC 2-Ohm 12-Inch Subwoofer.

The Rockford Fosgate is designed to produce some of the most powerful sounds of any car subwoofer on the market. Your standard 8ins subwoofer comes in at under 400 watts of juice, but the P3 DVC 2-Ohm 12-Inch subwoofer is capable of providing up to 1600 watts of power. This means it is able to produce much louder, clearer, and lower notes than other 8 inch subwoofers on the market. If you’re looking for a vehicle where people actually have to turn down their own headrest TVs after their car rides with you, then you’ll want one of these.

Conclusion

To answer your question: I love my subs, they make my Cadillac ride feel really alive. I like the under seat subs because it reduces the bass to a very good range. Keep in mind I have Polk Audio subs and a Alpine amp and wiring system in my car and I love what they have done. Now the best car subwoofer for you will really depend on your needs, budget, wants and desires. There are so many things to consider. But I will give you some helpful hints.

Our Recommendation

NameCategoryProduct
Rockville SS8P 400w 8" Slim Under-Seat Active Powered Car/Truck Subwoofer SubBest OverallRockville SS8P 400w 8" Slim Under-Seat Active Powered Car/Truck Subwoofer Sub
Kenwood KSC-PSW8 250W MaxBudget PickKenwood KSC-PSW8 250W Max
Rockford Fosgate PS-8 Punch Single 8" Amplified Loaded Enclosure SubwooferUpgrade PickRockford Fosgate PS-8 Punch Single 8" Amplified Loaded Enclosure Subwoofer