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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....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

    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....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

    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. Model:PB-4000-PIANO GLOSS
    SKU:6174938
    Top comment

    "Great Deep Bass...Highly recommended....Does a super job in trembling the room in action packed movies....Would definitely recommend to anyone who is looking for a sub for a home theater setup."

    ""

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    Product Description

    Fine-tune your bass experience with this SVS ported box subwoofer. It works with the SVS app for easy adjustment of EQ, crossover and other DSP settings, and its cool-running 1200W Class-D amplifier provides efficient yet powerful performance. Select from standard, extended and sealed modes to achieve a desired frequency response of this flexible SVS ported box subwoofer.
    $1,999.98
    Top comment

    "Great Deep Bass...Highly recommended....Does a super job in trembling the room in action packed movies....Would definitely recommend to anyone who is looking for a sub for a home theater setup."

    ""

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    Product Description

    Fine-tune your bass experience with this SVS ported box subwoofer. It works with the SVS app for easy adjustment of EQ, crossover and other DSP settings, and its cool-running 1200W Class-D amplifier provides efficient yet powerful performance. Select from standard, extended and sealed modes to achieve a desired frequency response of this flexible SVS ported box subwoofer.
  5. Top comment

    "Great Deep Bass...Highly recommended....Does a super job in trembling the room in action packed movies....Would definitely recommend to anyone who is looking for a sub for a home theater setup."

    ""

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    Product Description

    Feel the dynamics of subtle or intense bass details with this SVS ported box subwoofer. Its front-firing 13.5-inch driver provides low-frequency extension down to 13Hz for enhanced sonic accuracy, and it lets you fine-tune its DSP settings via the SVS app. The 1200W Class D amplifier of this SVS ported box subwoofer keeps powerful bass details clean and precise.
    $1,899.98
    Top comment

    "Great Deep Bass...Highly recommended....Does a super job in trembling the room in action packed movies....Would definitely recommend to anyone who is looking for a sub for a home theater setup."

    ""

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    Product Description

    Feel the dynamics of subtle or intense bass details with this SVS ported box subwoofer. Its front-firing 13.5-inch driver provides low-frequency extension down to 13Hz for enhanced sonic accuracy, and it lets you fine-tune its DSP settings via the SVS app. The 1200W Class D amplifier of this SVS ported box subwoofer keeps powerful bass details clean and precise.
  6. Top comment

    "Awesome medium sized sub...The real world measurements are impressive....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...The real world measurements are impressive....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.
  7. 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.
  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

    "It's exceptional and provides a great bass."

    ""

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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.
    $149.99
    Save $50
    Was $199.99
    Top comment

    "It's exceptional and provides a great bass."

    ""

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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. 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.
  14. Product Description

    Get rich bass and uniform coverage from your audio system with this Sonance Sonarray subwoofer. The HDPE enclosure resists corrosion, and the canopy design blends in seamlessly with your outdoor landscape. This 8-inch Sonance Sonarray subwoofer handles up to 150W and has a dual voice coil to provide multiple wiring options.
    $599.98

    Product Description

    Get rich bass and uniform coverage from your audio system with this Sonance Sonarray subwoofer. The HDPE enclosure resists corrosion, and the canopy design blends in seamlessly with your outdoor landscape. This 8-inch Sonance Sonarray subwoofer handles up to 150W and has a dual voice coil to provide multiple wiring options.
  15. Top comment

    "Boom, Boom, Boom...Overall good buy....Get into a good 15" sub for a fraction of others....Great bang for the buck"

    ""

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    Product Description

    Ensure your car stays rocking with this Planet Audio subwoofer. Its has 1050W of continuous power and a peak surge of 2100W to support booming bass notes, and the 4-ohm dual voice coils provide flexible wiring configurations for your audio setup. This 15-inch Planet Audio subwoofer captures rumbles as low as 25Hz. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
    $53.99
    Save $6
    Was $59.99
    Top comment

    "Boom, Boom, Boom...Overall good buy....Get into a good 15" sub for a fraction of others....Great bang for the buck"

    ""

    Hear more from customers

    Product Description

    Ensure your car stays rocking with this Planet Audio subwoofer. Its has 1050W of continuous power and a peak surge of 2100W to support booming bass notes, and the 4-ohm dual voice coils provide flexible wiring configurations for your audio setup. This 15-inch Planet Audio subwoofer captures rumbles as low as 25Hz. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.