Main Content

21 inch subwoofers

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

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

Browse the top-ranked list of 21 Inch Subwoofers 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. Top comment

    "5 stars...Love it...NOT OVER THE TOP THUMP THUMP THUMP IF YOU KNOW WHAT I MEAN, GREAT RECOMMENDATION BY DAVE,FILLS IN THE MISSING BASS I WAS LOOKING FOR...It sounds better than I could have ever imagined for the price that I paid.Truly thankful, these two, especially Joe, deserved a huge tip or bonus but I was cashless."

    ""

    Hear more from customers

    Product Description

    Boost the enjoyment of your car stereo with this Kicker CompC enclosure. The compact size is easy to install and fits smartly underneath or behind a seat, and the heavy MDF construction offers uncompromising durability. This Kicker CompC enclosure is compatible with CX600 1 subwoofers and provides a custom port design. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
    $112.49
    Save $37.50
    Was $149.99
    Top comment

    "5 stars...Love it...NOT OVER THE TOP THUMP THUMP THUMP IF YOU KNOW WHAT I MEAN, GREAT RECOMMENDATION BY DAVE,FILLS IN THE MISSING BASS I WAS LOOKING FOR...It sounds better than I could have ever imagined for the price that I paid.Truly thankful, these two, especially Joe, deserved a huge tip or bonus but I was cashless."

    ""

    Hear more from customers

    Product Description

    Boost the enjoyment of your car stereo with this Kicker CompC enclosure. The compact size is easy to install and fits smartly underneath or behind a seat, and the heavy MDF construction offers uncompromising durability. This Kicker CompC enclosure is compatible with CX600 1 subwoofers and provides a custom port design. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
  3. Product Description

    Eurolive B1800XP active subwoofer provides the ultimate in low-frequency reproduction, and the built-in stereo crossover makes it ideally suited for use with any of active 2-way loudspeakers. Packed with a powerful Class-D amplifier, a Turbosound long-excursion low-frequency transducer and an incredible array of professional features, the B1800XP produces extreme levels of low-end punch, with the definition and clarity typically reserved for much larger systems!
    $699.99

    Product Description

    Eurolive B1800XP active subwoofer provides the ultimate in low-frequency reproduction, and the built-in stereo crossover makes it ideally suited for use with any of active 2-way loudspeakers. Packed with a powerful Class-D amplifier, a Turbosound long-excursion low-frequency transducer and an incredible array of professional features, the B1800XP produces extreme levels of low-end punch, with the definition and clarity typically reserved for much larger systems!
  4. 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."

    ""

    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.
    $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.
  5. Model:PB16-ULTRA - PIANO GLOSS - 120
    SKU:5708037
    Top comment

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

    ""

    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.
    $2,499.98
    Top comment

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

    ""

    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.
  6. Top comment

    "Good price...very solid bass...It's paired with a amp I had in the garage like 200rms nothing special and the subwoofer sound great I plan to buy two more for my car one of these days...Wasn't expecting much out of this subwoofer, but I was impressed when I heard the bass!"

    ""

    Hear more from customers

    Product Description

    Pump out more bass with this Pioneer car subwoofer. Its reinforced MICA injection-molded resin cone stays rigid, while tight, deep bass sounds are produced with up to 400W nominal power. This 12-inch shallow-mount Pioneer car subwoofer is compact and comes with a carpeted nonslip enclosure for easy installation and long-lasting durability. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
    $123.99
    Save $126
    Was $249.99
    Top comment

    "Good price...very solid bass...It's paired with a amp I had in the garage like 200rms nothing special and the subwoofer sound great I plan to buy two more for my car one of these days...Wasn't expecting much out of this subwoofer, but I was impressed when I heard the bass!"

    ""

    Hear more from customers

    Product Description

    Pump out more bass with this Pioneer car subwoofer. Its reinforced MICA injection-molded resin cone stays rigid, while tight, deep bass sounds are produced with up to 400W nominal power. This 12-inch shallow-mount Pioneer car subwoofer is compact and comes with a carpeted nonslip enclosure for easy installation and long-lasting durability. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
  7. 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."

    ""

    Hear more from customers

    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."

    ""

    Hear more from customers

    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.
  8. 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."

    ""

    Hear more from customers

    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."

    ""

    Hear more from customers

    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.
  9. 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!...This is the best relatively compact sub hands down that won't overwhelm a room with its size!"

    ""

    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.
    $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!...This is the best relatively compact sub hands down that won't overwhelm a room with its size!"

    ""

    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.
  10. 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.
  11. Top comment

    "Great sub...Good Choice...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....Back in the audible range, the R-115SW can faithfully reproduce more of the nuances of bass instruments in live music."

    ""

    Hear more from customers

    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...Good Choice...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....Back in the audible range, the R-115SW can faithfully reproduce more of the nuances of bass instruments in live music."

    ""

    Hear more from customers

    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.
  12. 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....This one surpasses both of those in not only visceral impact but more importantly, detail."

    ""

    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.
    $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....This one surpasses both of those in not only visceral impact but more importantly, detail."

    ""

    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.
  13. 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....This sub will resolve more of your music and movies then you thought was there."

    ""

    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.
    $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....This sub will resolve more of your music and movies then you thought was there."

    ""

    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.
  14. Product Description

    Project your voice clearly and powerfully with this VocoPro vocal speaker. It has a 10-inch woofer with a high temperature voice coil for powerful audio, and its two 3-inch mid/high drivers provide enhanced audio. This VocoPro vocal speaker has PTC protection circuitry to guard against tweeter blowout and feedback during performances for high-quality results.
    $129.99
    Save $39.01
    Was $169.00

    Product Description

    Project your voice clearly and powerfully with this VocoPro vocal speaker. It has a 10-inch woofer with a high temperature voice coil for powerful audio, and its two 3-inch mid/high drivers provide enhanced audio. This VocoPro vocal speaker has PTC protection circuitry to guard against tweeter blowout and feedback during performances for high-quality results.
  15. 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.