The 7 Best 8-Inch Car Subwoofers of 2021

Jerry Wilson
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The past few years have seen an incredible boom in the car audio market. People want more and more with a subwoofer now seems to be part of the package. We are not surprised.

Having a subwoofer not only improves the sound quality when listening to music, as most people use their car audio system only for listening to music, but it also helps to improve the overall driving experience.

If you are looking for a new car subwoofer, you come to the right place, since we have selected the 7 best 8-inch car subwoofers of 2021.

Here are the 7 best 8-inch car subwoofers ready to buy.

NameCategoryProduct
Rockford Fosgate P3SD2-8 8" Dual 2-Ohm Punch Series Shallow Mount Car SubwooferBest OverallRockford Fosgate P3SD2-8 8" Dual 2-Ohm Punch Series Shallow Mount Car Subwoofer
BOSS Audio Systems CXX8 8 Inch Car SubwooferBudget PickBOSS Audio Systems CXX8 8 Inch Car Subwoofer
Rockville RW8CA 8" 600 Watt Low Profile Under-Seat Active Powered Car SubwooferUpgrade PickRockville RW8CA 8" 600 Watt Low Profile Under-Seat Active Powered Car Subwoofer

1. Rockford Fosgate P3SD2-8 8" Dual 2-Ohm Punch Series Shallow Mount Car Subwoofer

Our rating: 9 / 10

Rockford Fosgate P3SD2-8 8" Dual 2-Ohm Punch Series Shallow Mount Car Subwoofer

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Pros:

  • Lightweight
  • Plenty of power
  • Durable build

The Rockford Fosgate will go above and beyond your expectations. It’s shaped like an ordinary car subwoofer, but it packs a punch that jams to your tunes from the deepest bass to the highest treble.

It features anodized aluminum cone, cast aluminum frame, and high-output 8-inch power coil. The package comes with a 1-year warranty.

This 8-inch subwoofer comes as a package with a 24-inch long tinsel lead on the positive speaker terminal. It comes with shallow mount installation and PWM line output to keep your OEM amplifier exactly the way it is without any modifications needed.

2. JBL Stage810

Our rating: 9 / 10

JBL Stage810

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Pros:

  • Ultra low resistance
  • Includes a top of the line amp
  • Excellent bass
  • Included internal amplification
  • Extra Bluetooth port
  • High-gloss finish

Cons:

  • * Heavy

The JBL Stage810 is the dominating choice in the world of car subwoofers for several good reasons. It offers clean, booming bass that will knock the breath out of you. You can crank it up and have a blast.

The Stage810 includes a high-quality amplifier in its design that is capable of pushing out 1400 Watts of earth shaking juice at a small 3 Ohm load. The amplifier is built with a premium level of quality and will keep the sound crystal clear even at full power with no distortion.

JBL includes an optional Bluetooth adapter that will allow you to connect with your radios Bluetooth capability and stream music wirelessly to the subwoofer. This adapter will plug in directly to the 3.5mm auxiliary input located on the back of the unit.

3. Rockville RW8CA 8" 600 Watt Low Profile Under-Seat Active Powered Car Subwoofer

Our rating: 9 / 10

Rockville RW8CA 8" 600 Watt Low Profile Under-Seat Active Powered Car Subwoofer

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Pros:

  • 600W peak power
  • Highly affordable
  • Enclosure depth of just 0.72 inches
  • 2 ohms
  • Low profile of just 0.72 inches

The Rockville RW8CA is an active 8-inch car subwoofer that's ideal for smaller cars and even motorcycles. If you're looking for a very affordable car subwoofer with enough power to fill up your vehicle, this is the one to get.

The RW8CA features a paper cone for the bass speaker. The paper cones are usually used in budget audio drivers and they're good enough for most users. The speaker has an RMS power rating of 250W in a 4 ohms. This is where the Rockville RW8CA really shines purely for it's low price.

The RW8CA has a frequency response rating of 12 Hz to 150 Hz. This means that it can go down to about 12 Hz and still deliver a powerful bass. That's a surprisingly big range for a budget car subwoofer.

4. BOSS Audio Systems CXX8 8 Inch Car Subwoofer

Our rating: 8 / 10

BOSS Audio Systems CXX8 8 Inch Car Subwoofer

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Pros:

  • Compact, efficient design
  • Strong amp
  • Great build quality

(Black)

The CXX8 from Boss is an impressive value at its price point, offering up a lot of sound power in a relatively lightweight, efficient design. However, this is a relatively large, heavy sub — much heavier than most of its competitors — and will not be the best choice for those on a budget that need something light. If that’s what you’re looking for, you’ll want to look at the smaller CXX4.

This sub, which has an RMS of 300 watts and can produce up to 600 watts peak power, measures about 8 inches high, 7 inches wide, and 15 inches deep, with a port diameter of 3.25 inches. Its frequency response is rated at 25 to 150 Hz, as it can handle power up to 600 watts. The sub cone is made of woven carbon fiber. Mica-filled polypropylene provides the surround. That’s paired with a down-firing 4-ohm voice coil and vented pole piece to produce a high-quality bass sound. This thing also comes with a strong, multilayered steel basket and a really nice magnet cover.

5. Rockford Fosgate P3SD4-8 Punch P3S 8" 4-Ohm DVC Shallow Subwoofer

Our rating: 8 / 10

Rockford Fosgate P3SD4-8 Punch P3S 8" 4-Ohm DVC Shallow Subwoofer

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Pros:

  • Budget Friendly Option
  • Competitively Priced

The Rockford Fosgate P3SD4-8 Punch P3S 8" 4-Ohm DVC Shallow Subwoofer is a lower-range subwoofer that’s pretty budget friendly. The manufacturer is known for making high-quality, high-powered speakers, and this model doesn’t fall outside of this reputation.

With 1153W on a 2-ohm DVC, this substantial subwoofer can be used in the shallowest of enclosures; this saves your vehicle from high-cost modifications and gives you more flexibility when it comes to choosing your installation location.

The Rockford Fosgate P3SD4-8 uses a high-quality, rugged, 4-layer cellulose fiber cone design that’s also lightweight and produces great bass response.

6. Planet Audio AC8D 8 Inch Car Subwoofer

Our rating: 7 / 10

Planet Audio AC8D 8 Inch Car Subwoofer

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Pros:

  • 8"/200W/Cone/Paper
  • 8"/400W/Cone/Paper
  • 8"/600W/Cone/Paper

Cons:

  • Mounting depth
  • Warranty

(Replaces: AC8D8)

Get the Planet Audio AC8D if bass is your main concern. It comes with high-quality materials and can rock your entire trunk. The Planet Audio AC8D is all about large performance. It’s built of high-quality paper with rubber around it. The advantage of paper cones is that they won’t break down as much as others.

It’s got a soft surround, which means that it’s sturdy, and will last for a long time. Another great feature of the Planet Audio AC8D is the dual 4-Ohm voice coil. The benefit of having two voice coils is that you can wire it for more than one ohm. If you want to create a different setup, you can do so and have more control over how it functions.

7. Alpine Electronics PWE-S8 Restyle Compact Powered 8-Inch Subwoofer

Our rating: 7 / 10

Alpine Electronics PWE-S8 Restyle Compact Powered 8-Inch Subwoofer

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Pros:

  • Wireless Connection
  • Lots of Power
  • Compact Size
  • Bluetooth Connectivity
  • Movable Face
  • Easy To Use Interface
  • Ideal For Home and Car Use
  • Affordable

Cons:

  • Can’t Be Used With AMPS
  • Front Wiring Due to Lack of RCA
  • Instructions Are a Bit Vague

Alpine is a brand with decades of experience in the car audio industry and that has reflected in their products. I’ve been using their hardware for years now and have always found their products to be durable and reliable. This particular subwoofer comes with a “digital amp and the PureDigital Link” technology that energizes your sound. The amp adjusts the output of the subwoofer to deliver the best performance in the car.

Frequently Asked Questions (FAQ)

Are 8 inch subs any good?

We all know what a 12 or 10 inch subwoofer can do. They can shake your car apart, rattle your windows, and blast out the bass notes in your favorite songs. But 8 inch subs still can do the same thing, you just have to get the right sub.

Like we said, 8 inch subs can pack the same amount of punch and sound can turning out so much better. But you need to get the right in order for your car to have the same experience that you get from a large subwoofer. The quality of the speaker in your subwoofer is important. A low-quality speaker can cause distortion and poor sound even if the subwoofer is willing to work hard on producing solid low notes. Once you have a higher quality speaker in your subwoofer box, you have a better chance at hearing the excellent and clean sound that 8 inch subs give.

What is the loudest 8 inch subwoofer?

There is no official loudness measurement for a subwoofer. The spec numbers like RMS, peak power, and wattage are for amplifiers.

There are simple ways to measure sound in decibels (dB).

1 dB is the smallest unit we usually measure; double the volume and you double the dB so 30 dB is twice as loud as 10 dB, and 80 dB is four times as loud as 40 dB.

There are two ways to measure a subwoofer's dB output: peak output or RMS output.

Peak output is measured for about 3-6 seconds of musical peaks in a track. Peak output would be talking about the loudest sound subwoofer hits, not the loudest sustained volume.

RMS output, or root mean square is an average of the subwoofer's average or sustained volume. RMS is the most common way to describe a subwoofer's power and performance.

What is the most powerful car subwoofer?

Some subwoofers are simply created to be the most powerful subwoofer on the market. This isn’t the only thing you should be looking at when doing your car subwoofer research, but it’s a good place to start.

However, the most powerful subwoofer isn’t the best subwoofer in all cases. Many hatchbacks and sedans require a solid amount of decibels, but don’t need the massive amount of power. In these cases, a 40 or 50-watt RMS sub will do the trick. On the other hand, trucks and SUVs are built to carry more passengers and frequently contain a large amount of space. In this case, a sub pushing hundreds of watts is right for the job. Find what pushes your weight with a little elbow grease.

What is the hardest hitting 12 inch subwoofer?

The Rockford Fosgate P3D2 is one of the most capable subwoofers on the market. And it really makes a difference. This subwoofer is capable of producing an impressive amount of bass.

The Rockford Fosgate P3D2 is a dual 4 ohm woofer, which means it is capable of producing serious bass without taking up a lot of power. It is also capable of producing a great range of bass notes, due to the amount of cone area it has.

What else about this subwoofer is impressive? It can take up to a staggering 1200 watts of power! Plus it is extremely affordable. It isn’t often that you find such an impressive subwoofer that is also affordable.

Conclusion

If you are on a budget but still want to have a solid quality system that won’t require you to turn up the volume too high to make it sound good, then the 8-inch subwoofer is going to be the perfect option for you. It is easy to install and maintain, and it will provide you with the sound you need when driving in your ride. We tried to include as many affordable options as possible in our reviews and you will find both budget friendly and more expensive options in our list.

Our Recommendation

NameCategoryProduct
Rockford Fosgate P3SD2-8 8" Dual 2-Ohm Punch Series Shallow Mount Car SubwooferBest OverallRockford Fosgate P3SD2-8 8" Dual 2-Ohm Punch Series Shallow Mount Car Subwoofer
BOSS Audio Systems CXX8 8 Inch Car SubwooferBudget PickBOSS Audio Systems CXX8 8 Inch Car Subwoofer
Rockville RW8CA 8" 600 Watt Low Profile Under-Seat Active Powered Car SubwooferUpgrade PickRockville RW8CA 8" 600 Watt Low Profile Under-Seat Active Powered Car Subwoofer