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21 inch subs

Best Buy customers often prefer the following products when searching for 21 Inch Subs.

Browse the top-ranked list of 21 Inch Subs below along with associated reviews and opinions.

Browse the top-ranked list of 21 Inch Subs below along with associated reviews and opinions.

Main Results
  1. Product Description

    The LS15T SUB includes a wide bandwidth Sonance Laminated Core Transformer with an adjustable tap, making it flexible and powerful for any outdoor landscape application.
    $2,999.98

    Product Description

    The LS15T SUB includes a wide bandwidth Sonance Laminated Core Transformer with an adjustable tap, making it flexible and powerful for any outdoor landscape application.
  2. Model:PB16-ULTRA - BLACK OAK - 120V
    SKU:5708035
    Top comment

    "Its amazing...Great speaker....I can run my 2 pb2000's full volume tuned and them not be as loud as the 16 ultra....Amazing sub and last one you will ever need!!!"

    ""

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    Product Description

    Increase the bass output of your home stereo system with this 16-inch SVS subwoofer. It provides robust lows for your next party or event thanks to 1500W of continuous power, and it has a fiberglass-resin composite driver that doesn't flex or lose control with increased volumes. This SVS subwoofer has a front-panel display for easy control.
    $2,499.98
    Top comment

    "Its amazing...Great speaker....I can run my 2 pb2000's full volume tuned and them not be as loud as the 16 ultra....Amazing sub and last one you will ever need!!!"

    ""

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    Product Description

    Increase the bass output of your home stereo system with this 16-inch SVS subwoofer. It provides robust lows for your next party or event thanks to 1500W of continuous power, and it has a fiberglass-resin composite driver that doesn't flex or lose control with increased volumes. This SVS subwoofer has a front-panel display for easy control.
  3. Model:PB16-ULTRA - PIANO GLOSS - 120
    SKU:5708037
    Top comment

    "Its amazing...Great speaker....I can run my 2 pb2000's full volume tuned and them not be as loud as the 16 ultra....In my years of owning higher end gear and searching for something that could somehow make the viewing experience more enjoyable."

    ""

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    Product Description

    Entertain yourself with this SVS subwoofer. Its 16-inch driver produces 1500W of continuous power and has a 5000W peak capacity for high-quality performance, and the Sledge STA-1500D amplifier uses discrete MOSFET output to push the subwoofer's power limits. This SVS subwoofer has a structurally sound cabinet that lessens the chance of unwanted resonance.
    $2,499.98
    Top comment

    "Its amazing...Great speaker....I can run my 2 pb2000's full volume tuned and them not be as loud as the 16 ultra....In my years of owning higher end gear and searching for something that could somehow make the viewing experience more enjoyable."

    ""

    Hear more from customers

    Product Description

    Entertain yourself with this SVS subwoofer. Its 16-inch driver produces 1500W of continuous power and has a 5000W peak capacity for high-quality performance, and the Sledge STA-1500D amplifier uses discrete MOSFET output to push the subwoofer's power limits. This SVS subwoofer has a structurally sound cabinet that lessens the chance of unwanted resonance.
  4. Product Description

    Complete your vehicle's subwoofer installation with this Kicker L7 12-inch loaded subwoofer enclosure. The unique design boosts bass for a rich listening experience, and the streamlined shape brings a professional look to your audio system. With a simple setup, this Kicker L7 12-inch loaded subwoofer enclosure offers fast, hassle-free installation.
    $499.99
    Price Drop
    Save $200
    Was $699.99

    Product Description

    Complete your vehicle's subwoofer installation with this Kicker L7 12-inch loaded subwoofer enclosure. The unique design boosts bass for a rich listening experience, and the streamlined shape brings a professional look to your audio system. With a simple setup, this Kicker L7 12-inch loaded subwoofer enclosure offers fast, hassle-free installation.
  5. Top comment

    "Awesome medium sized sub...Hands down the best relatively compact sub!...In my room, I can get a FLAT corrected EQ curve to 15Hz at about 75db from Anthem Room Correction, WOW!...The KEF is an understated sub that does not draw much attention, which is good for the decor and spouse approval."

    ""

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    Product Description

    Feel the bass with this 12-inch KEF Kube subwoofer. Its built-in Class D amplifier connects directly to mixers, reducing the need for extra cables, and the 114dB output provides a pulsating boom that fills a large room. This sealed KEF Kube subwoofer's flexible configuration lets you design a sound system to match your space.
    $699.98
    Top comment

    "Awesome medium sized sub...Hands down the best relatively compact sub!...In my room, I can get a FLAT corrected EQ curve to 15Hz at about 75db from Anthem Room Correction, WOW!...The KEF is an understated sub that does not draw much attention, which is good for the decor and spouse approval."

    ""

    Hear more from customers

    Product Description

    Feel the bass with this 12-inch KEF Kube subwoofer. Its built-in Class D amplifier connects directly to mixers, reducing the need for extra cables, and the 114dB output provides a pulsating boom that fills a large room. This sealed KEF Kube subwoofer's flexible configuration lets you design a sound system to match your space.
  6. Product Description

    Wire your backyard for beautiful audio with this Sonance woofer. Its boulder-shaped polypropylene exterior lets it blends easily into outdoor landscapes, and its weather resistance stands up to rain, snow and heat. This Sonance woofer handles up to 150 watts for clear, powerful sound, and its dual voice coil provides several wiring options.
    $539.98

    Product Description

    Wire your backyard for beautiful audio with this Sonance woofer. Its boulder-shaped polypropylene exterior lets it blends easily into outdoor landscapes, and its weather resistance stands up to rain, snow and heat. This Sonance woofer handles up to 150 watts for clear, powerful sound, and its dual voice coil provides several wiring options.
  7. Top comment

    "Great sub...Best Bass!!...In addition to the battle sequences, the R115SW also enhanced some of the ambient bass sounds that I did not notice before; in particular, in the woods you will notice several rumbles that were not tied to any explosion or musket shot....I use my system for high quality movie watching so I have this paired with a 112SW sub and 7 other klipsch speakers ranging from 4 tower speakers, two bookshelf speakers and a nice center speaker."

    ""

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    Product Description

    The R-115SW subwoofer is the perfect combination of power, sophisticated and heart-pounding bass. Packing a serious punch, the R-115SW will not only wake your neighbors, it'll piss them off. The way only Klipsch can.
    $899.98
    Top comment

    "Great sub...Best Bass!!...In addition to the battle sequences, the R115SW also enhanced some of the ambient bass sounds that I did not notice before; in particular, in the woods you will notice several rumbles that were not tied to any explosion or musket shot....I use my system for high quality movie watching so I have this paired with a 112SW sub and 7 other klipsch speakers ranging from 4 tower speakers, two bookshelf speakers and a nice center speaker."

    ""

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    Product Description

    The R-115SW subwoofer is the perfect combination of power, sophisticated and heart-pounding bass. Packing a serious punch, the R-115SW will not only wake your neighbors, it'll piss them off. The way only Klipsch can.
  8. Model:SB16-ULTRA - BLACK OAK - 120V
    SKU:5708038
    Top comment

    "best speaker...Beyond Amazing...I started with 1 and was so impressed that I ordered a 2nd for a dual setup....I sure that I don't have it setup perfect."

    ""

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    Product Description

    Add powerful bass to your favorite tunes with this SVS Audio subwoofer. The 16-inch driver delivers a massive 1500W of power, while the fiberglass-resin composite cabinet and rigid internal bracing handles extreme volume outputs without flexing. The accompanying smartphone app provides real-time control over this SVS Audio subwoofer from afar.
    $1,999.98
    Top comment

    "best speaker...Beyond Amazing...I started with 1 and was so impressed that I ordered a 2nd for a dual setup....I sure that I don't have it setup perfect."

    ""

    Hear more from customers

    Product Description

    Add powerful bass to your favorite tunes with this SVS Audio subwoofer. The 16-inch driver delivers a massive 1500W of power, while the fiberglass-resin composite cabinet and rigid internal bracing handles extreme volume outputs without flexing. The accompanying smartphone app provides real-time control over this SVS Audio subwoofer from afar.
  9. Model:SB16-ULTRA - PIANO GLOSS - 120
    SKU:5708039
    Top comment

    "best speaker...Beyond Amazing...I started with 1 and was so impressed that I ordered a 2nd for a dual setup....I sure that I don't have it setup perfect."

    ""

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    Product Description

    Listen to sound at incredible volume with this 16-inch SVS Ultra subwoofer. Its 1500W RMS of power produce ultralow bass for thunderous vibrations and tone, letting you enjoy complete immersion in your tunes or movies. Fiberglass construction ensures minimal flexing and maximum sound control for distortion-free audio accuracy from this SVS Ultra subwoofer.
    $1,999.98
    Top comment

    "best speaker...Beyond Amazing...I started with 1 and was so impressed that I ordered a 2nd for a dual setup....I sure that I don't have it setup perfect."

    ""

    Hear more from customers

    Product Description

    Listen to sound at incredible volume with this 16-inch SVS Ultra subwoofer. Its 1500W RMS of power produce ultralow bass for thunderous vibrations and tone, letting you enjoy complete immersion in your tunes or movies. Fiberglass construction ensures minimal flexing and maximum sound control for distortion-free audio accuracy from this SVS Ultra subwoofer.
  10. Product Description

    Enjoy music from your garden with this Sonance RK10W granite subwoofer. It looks like a rock and blends in seamlessly with your plants, so you hear the sound but don’t see the equipment. This Sonance RK10W granite subwoofer enriches the bass of your system and its IPX4 rating ensures it can handle nature’s elements.
    $539.98

    Product Description

    Enjoy music from your garden with this Sonance RK10W granite subwoofer. It looks like a rock and blends in seamlessly with your plants, so you hear the sound but don’t see the equipment. This Sonance RK10W granite subwoofer enriches the bass of your system and its IPX4 rating ensures it can handle nature’s elements.
  11. Top comment

    "Awesome sub...It's exceptional and provides a great bass....This was a great buy for the amount of space I had in my 2017 Tacoma double cab."

    ""

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    Product Description

    Enjoy crystal-clear audio with this Kicker 8-inch subwoofer. Easily fit the subwoofer under the seat of your vehicle or behind your truck bench without having to modify the housing or your vehicle thanks to its compact size. The enclosure of this Kicker 8-inch subwoofer delivers deep, smooth bass wrapped together in a thin box. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
    $199.99
    Top comment

    "Awesome sub...It's exceptional and provides a great bass....This was a great buy for the amount of space I had in my 2017 Tacoma double cab."

    ""

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    Product Description

    Enjoy crystal-clear audio with this Kicker 8-inch subwoofer. Easily fit the subwoofer under the seat of your vehicle or behind your truck bench without having to modify the housing or your vehicle thanks to its compact size. The enclosure of this Kicker 8-inch subwoofer delivers deep, smooth bass wrapped together in a thin box. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
  12. Product Description

    Enjoy theater sound with this sealed KEF Kube subwoofer. Its 10-inch driver provides midsized rooms with 111dB of full, resonant tones, and the 24-140Hz frequency range keeps the air pulsating with deep bass. This KEF Kube subwoofer's built-in Class D amplifier lets you connect directly to mixers and avoid cable clutter.
    $599.98

    Product Description

    Enjoy theater sound with this sealed KEF Kube subwoofer. Its 10-inch driver provides midsized rooms with 111dB of full, resonant tones, and the 24-140Hz frequency range keeps the air pulsating with deep bass. This KEF Kube subwoofer's built-in Class D amplifier lets you connect directly to mixers and avoid cable clutter.
  13. Product Description

    Add powerful bass to your next party with this 18-inch Gemini subwoofer. Its 3400W Class D amplifier provides professional-quality sound, and the high-temperature pure copper voice coil creates heart-pounding bass. This Gemini subwoofer has integrated handles for easy portability and a digital sound processor with multiple presets for variable environments.
    $537.99
    Save $261.96
    Was $799.95

    Product Description

    Add powerful bass to your next party with this 18-inch Gemini subwoofer. Its 3400W Class D amplifier provides professional-quality sound, and the high-temperature pure copper voice coil creates heart-pounding bass. This Gemini subwoofer has integrated handles for easy portability and a digital sound processor with multiple presets for variable environments.
  14. Top comment

    "great purchase...Great subwoofers...i order the wrong 15s thinking I put the 3000 watt subs in my cart but the lil brother is not that bad im going to get another to do what I want to do...I love my speakers they're awesome, I would definitely recommend them to a friend"

    ""

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    Product Description

    When technology advances, products do as well. Does Lamborghini need to refine their cars every 2 years? NO, they do because they can. After 6 years, it is time for a change. Say "See Ya!" to the old MOFO, and welcome the MOFO-X subwoofers! The motor is refined and increases efficiency dramatically! MOFO-X subs use a non-pressed pulp cone for durability and smooth low bass. Like the original MOFOs, this model still use an aluminum dustcap that couples to the voice coil former and extends over the cone. Why? The fins brace the cone and eliminate cone flex during high excursion. Since the cap is aluminum and coupled to the coil former, it acts as a heat sink or heat extractor. The MOFO-X subs yield superior performance!

    $149.99
    Top comment

    "great purchase...Great subwoofers...i order the wrong 15s thinking I put the 3000 watt subs in my cart but the lil brother is not that bad im going to get another to do what I want to do...I love my speakers they're awesome, I would definitely recommend them to a friend"

    ""

    Hear more from customers

    Product Description

    When technology advances, products do as well. Does Lamborghini need to refine their cars every 2 years? NO, they do because they can. After 6 years, it is time for a change. Say "See Ya!" to the old MOFO, and welcome the MOFO-X subwoofers! The motor is refined and increases efficiency dramatically! MOFO-X subs use a non-pressed pulp cone for durability and smooth low bass. Like the original MOFOs, this model still use an aluminum dustcap that couples to the voice coil former and extends over the cone. Why? The fins brace the cone and eliminate cone flex during high excursion. Since the cap is aluminum and coupled to the coil former, it acts as a heat sink or heat extractor. The MOFO-X subs yield superior performance!

  15. Model:AW10-LSUB-BR
    SKU:6225332

    Product Description

    Bring music outdoors with this 10-inch Russound subwoofer. Its tuned port tube delivers tight, powerful bass, and its silicone elbow offers flexibility in extreme temperatures. The bass chamber of this dark brown Russound subwoofer is made of PVC for durability underground, and it blends in with the natural landscape environment.
    $1,300.98

    Product Description

    Bring music outdoors with this 10-inch Russound subwoofer. Its tuned port tube delivers tight, powerful bass, and its silicone elbow offers flexibility in extreme temperatures. The bass chamber of this dark brown Russound subwoofer is made of PVC for durability underground, and it blends in with the natural landscape environment.