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.

  1. 1.
    KICKER - VSS™ SubStage™ 10" Dual-Voice-Coil 1-Ohm Subwoofer with Enclosure and Integrated 200W Amp - Black Grained-Front_Standard

    • Model: SCRU11
    • SKU: 5802022
    Not yet reviewed
    Enjoy quality sound with this Kicker subwoofer upgrade kit. It connects to the original audio components of your 2011-2015 Chevrolet Cruze auto to create a high-performance system that delivers strong bass tones. This Kicker subwoofer upgrade kit has a multichannel DSP amplifier that provides acoustic control while drawing minimal power. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
  2. 2.
    KICKER - CompC Loaded Enclosures Single-Voice-Coil 4-Ohm Subwoofer - Black carpet-Front_Standard

    • Model: 44TCWC104
    • SKU: 5712388

    5 stars...Nice Sub...I got two of these installed in my Yukon Denali and they are amazing!...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

    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. 3.
    SVS - 16" 1500W Powered Subwoofer - Black Oak Veneer-Front_Standard

    • Model: PB16-ULTRA - BLACK OAK - 120V
    • SKU: 5708035

    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.

    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.
  4. 4.
    SVS - 16" 1500W Powered Subwoofer - Gloss piano black-Front_Standard

    • Model: PB16-ULTRA - PIANO GLOSS - 120
    • SKU: 5708037

    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.

    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.
  5. 5.
    KICKER - VSS™ SubStage™ 10" Dual-Voice-Coil 1-Ohm Subwoofer with Enclosure and Integrated 200W Amp - Black Grained-Front_Standard

    • Model: SSICRE07
    • SKU: 5802025
    Not yet reviewed
    Get the sound you want with these Kicker Silverado/Sierra crew cab subwoofers. They have an original factory design, so they look great in your truck, and they are high efficiency, ensuring minimum drain on your battery. These Kicker Silverado/Sierra crew cab subwoofers can be mounted without modifications to your interior. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
  6. 6.
    KICKER - VSS™ SubStage™ 10" Dual-Voice-Coil 1-Ohm Subwoofer with Enclosure and Integrated 200W Amp - Black Grained-Front_Standard

    • Model: SCHAL08
    • SKU: 5802028
    Not yet reviewed
    Enhance your car's audio quality with this Kicker subwoofer upgrade kit. The multichannel amplifiers use minimal battery power and provide DSP technology suited expressly to your vehicle. This Kicker subwoofer upgrade kit lets deep bass tones pound and is designed to fit the original factory specifications of the 2008-2014 Dodge Challenger. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
  7. 7.
    KICKER - VSS™ SubStage™ 10" Dual-Voice-Coil 1-Ohm Subwoofer with Enclosure and Integrated 200W Amp - Black Grained-Front_Standard

    • Model: SSIEXT07
    • SKU: 5802031
    Not yet reviewed
    Turn commutes into in-car parties with this Kicker subwoofer upgrade system for 2007-2013 Chevrolet Silverado models. Low power-draw amplifiers provide enhanced audio detail, while booming bass tones keep the beat going. The quick installation of this Kicker subwoofer upgrade system requires no modifications to your car, and the factory-look parts blend in seamlessly. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
  8. 8.
    KICKER - VSS™ SubStage™ 10" Dual-Voice-Coil 1-Ohm Subwoofer with Enclosure and Integrated 200W Amp - Black Grained-Front_Standard

    • Model: SSICRE14
    • SKU: 5802019
    Not yet reviewed
    Party in the car with this Kicker subwoofer upgrade system for the 2014-2016 Chevrolet Silverado. It instantly introduces soul-moving bass sounds into your cabin, and its easy installation requires no modifications. Take advantage of the enhanced audio detail provided by the extra efficient, low-power-draw amplifiers of this Kicker subwoofer upgrade system. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
  9. 9.
    Pioneer - 12" Single-Voice-Coil Subwoofer with Enclosure - Black-Angle_Standard

    • Model: TSSWX3002
    • SKU: 5588603

    Good price...very solid bass...Wasn't expecting much out of this subwoofer, but I was impressed when I heard the bass!...Good sound and power for the price and convenience of the slim feature

    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.
  10. 10.
    Alpine - 10" Single-Voice-Coil 2-Ohm Subwoofers with Enclosure - Gray-Front_Standard

    • Model: SBT-S10V
    • SKU: 5210505

    Very Powerful Subwoofer...This subwoofer produces loud, clean bass.

    Squeeze a little base into your truck with this Alpine enclosed subwoofer. Made to fit into tight spaces, this setup is pretuned and ready to install the moment it arrives. The ported enclosure features a 10-inch subwoofer with a frequency response of 28-200Hz, so you never miss a bit of bass.
  11. 11.
    KICKER - 8" Dual Voice Coil 2-Ohm Subwoofer with Integrated 200W Amp - Black-Front_Standard

    • Model: SF150SC15
    • SKU: 5802021
    Not yet reviewed
    Enjoy powerful sound in your 2015 Ford F-150 Super Cab or Super Crew truck with this Kicker subwoofer upgrade system. It delivers strong bass for deep, rich tones, and it has low-power-draw amplifiers for high-performance audio. This Kicker subwoofer upgrade system mounts directly to your vehicle for quick, convenient installation. Geek Squad® Installation Recommended Visit your local Best Buy store for more information.
  12. 12.
    KICKER - 10" Dual Voice Coil 2-Ohm Subwoofer with Integrated 200W Amp - Black-Front_Standard

    • Model: SF150C09
    • SKU: 5802033
    Not yet reviewed
    Make your ride as exciting as the club with this Kicker subwoofer upgrade system for 2009-2014 Ford F-150 Super Crews. Its easy installation requires no modifications, and it instantly lets earth-shaking bass tones accompany your regular commute. Multi-channel amplifiers on this Kicker subwoofer upgrade system draw out audio detail for optimal listening.
  13. 13.
    Klipsch - Reference Series 15" 400W Powered Subwoofer - Black-Front_Standard

    • Model: R-115SW
    • SKU: 5708509

    Great sub...Good Choice...This sub is massive yet fits great in my space, the sound and the feel of the sound is like I have never felt ....Before I ran calibration set-up, I set sub gain to halfway mark, and receiver still added 7db of gain to it.

    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.
  14. 14.
    SVS - 16" 1500W Powered Subwoofer - Black oak veneer-Front_Standard

    • Model: SB16-ULTRA - BLACK OAK - 120V
    • SKU: 5708038

    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.

    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.
  15. 15.
    KICKER - PowerStage 10" 2-Ohm Subwoofer with Multichannel Amp - Black-Front_Standard

    • Model: PSICRE14
    • SKU: 4745201

    Amazing Sound!!...Best Buy installed it perfectly!!!...The multichannel amp and digital enhancer significantly improved the sound from the stock speakers and powered 10" subwoofer sounds awesome....The bass from the sub is smooth and can be felt without hitting too hard.

    Kicker PowerStage Subwoofer: Upgrade your Chevy Silverado or GMC Sierra Crew Cab audio system with this 10" subwoofer and multichannel amplifier that mounts directly to factory locations for simple installation.

Shopping ideas related to 21 Inch Subwoofers

powerful car audio
KICKER - CX Series CXA6001 1200W Class D Mono Amplifier with Adjustable KickEQ Bass Boost - Black-Front_Standard
"Seems to have good consistent power"
reference subwoofers
Klipsch - Reference 12" 400W Powered Subwoofer - Black-Front_Standard
"The whole reference series from Klipsch is top notch..."
bass enclosures
KICKER - CompR Dual 12" Dual-Voice-Coil 2-Ohm Subwoofers with Enclosure - Black-Front_Standard
"Good bass for the price"
clean bass subwoofer
Polk Audio - PSW Series 10" Active Subwoofer - Black-Angle_Standard
"Great speaker and has a lot of bass."