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Best 15-inch Subwoofers – Top 8 Picks of 2021 Review & Buying Guide

The best way to give some depth and character to music is by adding one or multiple subwoofers to your audio system. This will increase the lows and low mids, resulting in an enhanced warm deep bass. 

But what if you really want to feel the music? For true earth-shattering, earthquake-causing, bone-shaking bass, you’ll need at least one 15-inch subwoofer. But, with so many options available, how do you know which one to choose?

Well, I decided to put together a list of the best 15-inch subwoofers so you can confidently take your audio system to an entirely new level. So, let’s find the perfect one for you…

Best 15-inch Subwoofers

Top 8 Best 15-inch Subwoofers You Should Buy in 2021 Reviews

  1. Skar Audio SDR-15 – Best 1200-watt 15-inch Subwoofer
  2. Planet Audio AC15D – Best Polypropylene 15-inch Subwoofer
  3. Power Acoustik BAMF-154 – Best Voice Coil 15-inch Subwoofer
  4. Rockville Punisher – Best 1-ohm 15-inch Subwoofer
  5. Rockville K6 Series 2 – Best OFC 15-inch Subwoofer
  6. AudioPipe TXX-BDC4 – Best Easy Mount 15-inch Subwoofer
  7. Kicker CompC – Best Low Profile 15-inch Subwoofer
  8. Harmony Audio HA-C152 – Best Carbon 15-inch Subwoofer

1 Skar Audio SDR-15 – Best 1200-watt 15-inch Subwoofer

The SDR-15 subwoofer from Skar Audio has been designed to be a pounding speaker that will shake the world. It is capable of both low note reproduction along with fantastic sound quality. Plus, it’s one of the most affordable 15-inch subwoofers on the market.

A traditional speaker style in plain black will blend perfectly with almost any car interior. Skar’s simple white logo can be found in the center of the paper cone, giving an understated, almost stealth look. 

1,200-watts of peak power…

This pumping 15-inch subwoofer can produce up to 1,200 watts of peak power and up to 600 watts RMS. The difference between peak and RMS (Root Mean Square) power is how long the speaker can sustain that level of power.

Skar Audio’s SDR-15 can handle a maximum of 1,200 watts for a short period. With 600 watts of RMS, the speaker can maintain this power consistently over a longer period. These figures are enough to shake the neighborhood.

Wide frequency response… 

With a frequency response of between 20Hz and 250Hz, this covers almost the entirety of the common low range. Typically when listening to audio, the low range consists of between 20Hz to 300Hz. 

Sensitivity is rated at 85.9dB allowing for high-level volumes to remain clear. Even though this is a large 15-inch speaker, it only requires a mounting depth of 7.62-inches (19.35-centimeters). This will help to fit in most trunks or hatches.

Skar Audio SDR-15
Our rating:4.4 out of 5 stars (4.4 / 5)

Pros

  • The traditional and understated style will suit most installations.
  • 1,200 watts of peak and 600 watts of RMS power.
  • The frequency response covers almost the entire low range.

Cons

  • The paper cone could be damaged if used regularly.
  • Plain styling might not be for everyone.

2 Planet Audio AC15D – Best Polypropylene 15-inch Subwoofer

If you’re after a subwoofer that is a little more resilient and durable, check out the Planet Audio AC15D. Instead of using a paper cone that is more susceptible to damage, the AC15D uses a much stronger polypropylene cone. As a result, this is one of the most durable 15-inch subwoofers around.

Strength and performance…

Not only does the Planet Audio AC15D offer increased strength, but it also provides impressive performance. The dual voice coils can withstand high temperatures. This allows the speaker to provide more bass at higher efficiency.

The peak power output of these great speakers is an incredible 2,100 watts with an RMS of 1,050 watts. That is plenty of power to let anyone within proximity not only hear but feel you coming down the street.

Fantastic value…

At such an affordable price and enough space in your vehicle, why not add two of these beasts to an enclosure? Featuring a stamped basket, these subwoofers offer a strong and rigid platform for quick and simple mounting.

The foam used in the construction of the AC15D is incredibly flexible. It provides more travel and, therefore, more bass. For anyone that wants to add their own touch, the trim ring is also fully customizable.

Planet Audio AC15D
Our rating:4.2 out of 5 stars (4.2 / 5)

Pros

  • Strong construction with a stamped basket and polypropylene cone.
  • Peak power of 2,100 watts and 1,050 watts RMS.
  • Amazingly affordable option.

Cons

  • A longer wear-in period is required before listening at full potential.
  • Best performance in a ported enclosure.

3 Power Acoustik BAMF-154 – Best Voice Coil 15-inch Subwoofer

Now we’re talking power and huge bass with these 15-inch BAMF subwoofers from Power Acoustik. Engineered to withstand even the most extreme conditions, these speakers can be pushed to the max.

One of the standout features here is the freakishly oversized motor structures. They provide magnetic inertia capabilities that exceed what is required for any subwoofer, ensuring earth-shattering results. There, this is one of the most powerful 15-inch subwoofers you can buy.

Lightweight frame…

To compensate for the powerful magnetic strength, the frame is constructed from lightweight die-cast aluminum. This adds rigidity, and at the same time, minimizes heat build-up. Additionally, it is also resonant resistant.

Dual Poly-cotton suspension helps to dampen violent acceleration that results in cleaner low-frequency audio. When combined with the extended excursion polyether-foam surround, included U/V protection peak performance is possible.

This is a stitch-up…

Stitching has been used strategically for added strength and durability of the speaker components. The cone and surround joints have been stitched and glued for the strongest possible bond.

Stitching can also be found on the voice coil leads that offer the highest possible protection. Not only have the highest quality materials been used to create this subwoofer, but the attention to detail in workmanship is also superb. In the end, it’s one of the best high-performance 15 subwoofers on the market.

Power Acoustik BAMF-154
Our rating:4.4 out of 5 stars (4.4 / 5)

Pros

  • Up to 3,800 watts of peak and 1,900 watts of RMS power.
  • Huge magnetic power and motor structures.
  • High-quality materials and workmanship translate to impressive performance.

Cons

  • Not as affordable as other subwoofer options.
  • A powerful amplifier is required for maximum results.

4 Rockville Punisher – Best 1-ohm 15-inch Subwoofer

There is a reason this subwoofer from Rockville is called the Punisher. It features only a 1-ohm resistance meaning that the final output will be much louder. Usually, with lower resistance, higher volumes are possible, but often at lower overall quality.

Rockville has taken several steps to ensure you can pump this sub up to eleven, but also maintain quality. The cone has been made incredibly stiff and strong using ultra-thick polypropylene for reduced distortion.

It’s all about the POWER…

Due to the ultra-low 1-ohm resistance, the Punisher is capable of up to an incredible 6,000 watts of peak and 3,000 watts RMS power. With great power comes great responsibility, and Rockville takes this seriously.

To assist in keeping all that power under control, there is an oversized aluminum heatsink coil. This dissipates heat efficiently so the voice coil can remain cool and operate with maximum efficiency.

Engineered for success…

Each component of these subwoofers has been over-engineered to ensure incredible, reliable, and consistent performance. Everything down to the high-grade black glue, which can handle temperatures well beyond the capabilities, has been used.

Each material is a thick gauge to provide strength and durability while still being able to offer flexibility and efficiency. Rockville even includes their own custom gasket so installations can be as airtight as possible. So, if you want the loudest 15-inch subwoofer, look no further.

Rockville Punisher
Our rating:4.6 out of 5 stars (4.6 / 5)

Pros

  • The low resistance of only 1-ohm makes 6,000 watts of peak power possible.
  • Aluminum heatsink coil to efficiently dissipate heat.
  • Over-engineered components for maximum strength and performance.

Cons

  • Premium performance means a premium price tag.
  • High-quality accessories are required for maximum performance.

5 Rockville K6 Series 2 – Best OFC 15-inch Subwoofer

I’ve included another Rockville product that is slightly more affordable but still offers incredible performance. The K6 Series 2 offers 2 ohms of resistance, which is still a low impedance capable of some huge amounts of power.

Peak power from this subwoofer is up to an impressive 4,000 watts. The RMS power rating is CEA rated at 1,000 watts. It’s not all about the power, though, as audio quality is often much more important.

Oxygen-free copper…

Helping to achieve the maximum audio quality are 3-inch (7.6-centimeter) four-layer black aluminum voice coils. They are then wrapped in 100% oxygen-free copper made in the USA for higher quality and durability.

There are two main advantages of using OFC (Oxygen-Free Copper). One is the increased conductivity that is provided, creating higher efficiency. The other is a less distorted signal which makes cleaner and higher quality audio possible.

Custom gaskets…

Rockville includes their custom gaskets with the K6 Series 2 so that installations can have a completely airtight finish. This also adds to the aesthetics of the speaker resulting in a clean and attractive finish.

The best terminals on the market are used so that any gauge wire can be easily connected. They are chrome-plated binding post-style terminals for once again maximum conductivity. Enjoy both lows and mids with a frequency response of between 37.8Hz and 1.5kHz.

Rockville K6 Series 2
Our rating:4.5 out of 5 stars (4.5 / 5)

Pros

  • Two ohms of resistance with 4,000 watts and 1,000 watts of RMS power.
  • 100% OFC made in the USA wrapped voice coils.
  • Rockville custom gasket included for airtight installation.

Cons

  • Your car might need an alternate power supply.
  • Professional installation will probably be required.  

6 AudioPipe TXX-BDC4 – Best Easy Mount 15-inch Subwoofer

If you’re looking for a multi-subwoofer system, then choosing the AudioPipe TXX-BDC4 would be a great decision. They are designed with a custom spider ring that makes both parallel and series wiring easier.

You will need a large area for installation, though, as a mounting depth of 8.88-inches (22.6-centimeters) is required. This means a larger enclosure will be necessary also and should be taken into consideration.

Quad stack voice coil…

Featured in these huge AudioPipe subwoofers is a 4-layer quad stack dual voice coil providing incredible performance. Electrical energy is converted into magnetic energy with high efficiency creating impressive audio quality.

Combined with a premium quality 250-ounce magnet, amazingly crisp and clear audio quality can be delivered. A frequency response of between 18Hz and 800Hz offers super low and deep bass, unlike anything you’ve ever experienced.

Huge power…

The peak maximum power output for the AudioPipe subwoofer is a huge 2,800 watts. It can also sustain a massive 1,400 watts of RMS power for sustained bass performance. This is all delivered with a 2-ohm impedance.

To house the intricate wiring at the rear of the speaker is a powder-coated aluminum basket. Not only does this add to the durability, but it will also prolong the life of the speaker. This is one heavy-duty speaker weighing in at 39.7 pounds (18 kilos). And easily a real contender for the best 15-inch subwoofer.

AudioPipe TXX-BDC4
Our rating:4.3 out of 5 stars (4.3 / 5)

Pros

  • Easily complete series or parallel wiring with a custom spider ring.
  • Huge 250-ounce magnet for crisp and clear audio.
  • Durable powder-coated aluminum basket.

Cons

  • Heavy speaker at 39.7 pounds (18 kilos).
  • Extra battery or upgraded alternator will be required.

7 Kicker CompC – Best Low Profile 15-inch Subwoofer

Since beginning in 1973 as a two-man operation from a narrow one-car garage, Kicker has come a long way. Their products are no longer hand-built with few resources, but their passion and drive have only grown.

Kicker is now one of the most recognized names within the mobile-audio market. They are known for producing high-quality products at affordable prices, bringing an improved audio experience to a wider audience. And this is one of the most popular 15-inch subwoofers out there.

Thick stamped steel basket…

The 15-inch Kicker CompC uses a thick stamped steel basket for added strength and durability. This is what holds the injection-molded polypropylene cone, complete with stabilizing ribs in the surrounding.

Every time you crank the volume, you can take advantage of the next-level engineering. Clean and undistorted bass is the result of utilizing this level of workmanship combined with the latest technologies.

Clean and directed power…

The CompC offers 4 ohms of impedance along with 1,200 watts of peak power. The maximum RMS power is 600 watts for sustained and clean low-frequency audio. Frequency response of between 25Hz and 500Hz covers beyond the entire standard low range.

Although the power output in both peak and RMS is lower than some of the other products here, the sound quality is fantastic. This is a case of quality over quantity. You’ll feel every heart-beating moment from your favorite audio tracks.

Kicker CompC
Our rating:4.1 out of 5 stars (4.1 / 5)

Pros

  • Kicker is one of the most recognized names in mobile audio.
  • Injection-molded polypropylene cone with stabilizing ribs.
  • Clean and undistorted bass despite lower power.

Cons

  • Lower volume levels than other products with higher power capabilities.
  • Only available with bright yellow highlights. 

8 Harmony Audio HA-C152 – Best Carbon 15-inch Subwoofer

For the final product, I’ve included something a little different from Harmony Audio. This 15-inch subwoofer uses a carbon fiber cone. It provides the ultimate in both strength and flexibility for superior audio performance.

The carbon fiber cone is surrounded by high-roll foam for maximum SPL (Sound Pressure Level) excursion. At the rear is a massive double stacked magnet motor used to deliver an unrivaled bass response. As well as being able to handle high power levels.

Effective heat management…

One of the most important aspects of any subwoofer is heat management. Harmony Audio ensures efficient disbursement with the use of large slotted vents located directly under the spider. Cool air can quickly and easily reach all of the necessary components.

Furthermore, Harmony Audio Carbon Series subwoofers use only the highest quality components. This includes interwoven tinsel leads that don’t come in contact with the cone for connecting the voice coil to the input terminal. 

Only the best will do…

Spring-loaded push terminals connect your subwoofer to your amplifier. This allows for faster and easier installation and also ensures the cables will remain connected. With this speaker, you can be sure of both the connection and power transfer.

Impedance for the Carbon Series is 2 ohms with a peak maximum power output of 2,800 watts. The subwoofer can also sustain up to 1,400 watts RMS providing a frequency response of between 39Hz and 300Hz.

Harmony Audio HA-C152
Our rating:4.6 out of 5 stars (4.6 / 5)

Pros

  • The carbon fiber cone is both durable and flexible.
  • Interwoven tinsel leads don’t contact the cone during operation.
  • High-quality spring-loaded push terminals.

Cons

  • Less affordable than other options.
  • Needs a capable amplifier.

Best 15-inch Subwoofer Buying Guide

Best 15-inch Subwoofer Buying Guide

Now that you have an idea of what’s available for large 15-inch earth-shaking subwoofers, it’s time to make a decision. With so many great products available, it’s going to be a difficult choice. That’s why I’ve included this handy buying guide.

I will cover some of the key differences between these products. You should then be able to make a more confident decision with which of these subwoofers will best suit your needs.

Do you already own an amplifier?

If you already own an amplifier, then you might need to find a subwoofer that matches its performance. There is a huge selection I have included in this review, so make sure you check out both the impedance (ohms) and the RMS (power) of each subwoofer.

Some of you might be looking at building a system from scratch and plan on buying an amplifier to match the speakers. Don’t forget to check out a bunch of different amps to factor this into the overall budget of your build.

What type of vehicle do you own?

These are some large speakers. The 15-inch subwoofer alone is already massive, but don’t forget you’ll also need an enclosure. This will take up even more space, especially if you are considering a multiple subwoofer system.

You need to be realistic when it comes to space in your vehicle. Although there are some amazing custom build possibilities, this can become rather expensive. If you can squeeze these monsters in, you certainly won’t regret it. Your neighbors might, though.

If you’re still wondering which of these subwoofers is for you, then stick around to find out, because next, I will announce which of these products I believe is the best and why, but before that, do you…

Need Some More Great Speaker Options?

We can help you find what you need. Check out our in-depth reviews of the Best 6.5 Speakers, the Best 6×8 Speakers, the Best Bookshelf Speakers Under $500, the Best Floor Standing Speakers, the Best Tailgate Speakers, the Best Powered Speakers, and the Best PA Subwoofers you can buy in 2021.

And don’t miss our handy guides on Why Do Some Subwoofers Have Left and Right InputsHow to Connect a Subwoofer to an AmplifierDifference Between an Active and Passive Subwoofer, and Subwoofer Placement for more useful information.

What is the Best 15-inch Subwoofer?

All of these products have something slightly different to offer, each with its strengths and weaknesses. To be the best subwoofer, it needs to be an all-around performer. It must offer high-quality audio, reliable performance, and offer great value.

The product I believe achieves the highest in all of these areas is the…

Skar Audio SDR-15

When it comes to bang for your buck performance, along with providing high-quality audio, the Skar audio is a clear winner. These subwoofers are incredibly reliable and will suit most installations without too much hassle.

Until next time, happy listening.

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About Jennifer Bell

Jennifer is a freelance writer from Montana. She holds a BA in Creative Writing and English, as well as an Associate of Applied Science in Computer Games and Simulation Design.

Her passions include guitar, bass, ukulele, and piano, as well as a range of classical instruments she has been playing since at school. She also enjoys reading fantasy and sci-fi novels, yoga, eating well, and spending time with her two cats, Rocky and Jasper.

Jennifer enjoys writing articles on all types of musical instruments and is always extending her understanding and appreciation of music. She also writes science fiction and fantasy short stories for various websites and hopes to get her first book published in the very near future.

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