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21 inch subs

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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.

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  1. Hisense - 2.1 Channel Soundbar with Wireless Subwoofer - Black - Front_Zoom
    Top comment

    "Very nice modern and sleek- only down fall it disconnects from the sub woofer every time I change the channel don’t like the WiFi connection...Great sound. Matched with 75 inch Hisence TV. For less than 500 for both . This is going to be the next Samsung at half the price"

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    Product Description

    The Hisense HS2100 2.1 Channel Soundbar creates incredible sound in a compact and sleek form factor. The wireless subwoofer ensures that you’ll hear and feel every “boom” your entertainment content can throw at it. The HS2100 is also Roku TV Ready so you can control both your Roku TV and the soundbar with the Roku TV remote. Big sound that delivers a huge entertainment experience.
    See all Sound Bars
    Top comment

    "Very nice modern and sleek- only down fall it disconnects from the sub woofer every time I change the channel don’t like the WiFi connection...Great sound. Matched with 75 inch Hisence TV. For less than 500 for both . This is going to be the next Samsung at half the price"

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    Product Description

    The Hisense HS2100 2.1 Channel Soundbar creates incredible sound in a compact and sleek form factor. The wireless subwoofer ensures that you’ll hear and feel every “boom” your entertainment content can throw at it. The HS2100 is also Roku TV Ready so you can control both your Roku TV and the soundbar with the Roku TV remote. Big sound that delivers a huge entertainment experience.
    See all Sound Bars
    See all Sound Bars
  2. Edifier - G1500 MAX 2.1 Bluetooth Gaming Speakers with RGB Lighting (3-Piece) - Black - Front_Zoom
    Top comment

    "Small speakers and sub with fair sound...The speakers and sub were smaller than I expected. They sound ok and have enough bass with the sub. "

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    Product Description

    High-Quality 2.1 audio sound system. The G1500 MAX 2.1 speaker system, boasting a peak power of 60W, ensures immersive audio experiences. With dual 2.5-inch full-range speaker drivers in each satellite, it produces clear highs and rich mid-tones. Complemented by a 4-inch subwoofer, the system delivers deep, impactful bass, enhancing the quality of music, movies, or games.
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    Top comment

    "Small speakers and sub with fair sound...The speakers and sub were smaller than I expected. They sound ok and have enough bass with the sub. "

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    Product Description

    High-Quality 2.1 audio sound system. The G1500 MAX 2.1 speaker system, boasting a peak power of 60W, ensures immersive audio experiences. With dual 2.5-inch full-range speaker drivers in each satellite, it produces clear highs and rich mid-tones. Complemented by a 4-inch subwoofer, the system delivers deep, impactful bass, enhancing the quality of music, movies, or games.
    See all Gaming Speakers
    See all Gaming Speakers
  3. SVS - 13-1/2" 1200W Powered Subwoofer - Gloss Piano Black - Front_Zoom

    Model: SB-4000-PIANO GLOSS
    SKU: 6174937
    Top comment

    "I've heard many, many subs and SVS sounds better than all of them by a long shot. ...It is easy to set the subs volume to blend in with the front speakers."

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    Product Description

    Add thumping bass to a home theater with this 13.5-inch SVS subwoofer. Its 1200W RMS power delivers powerful sound, and its built-in amplifier is tuned specifically to the unit for optimal ground-shaking performance. This sealed-box SVS subwoofer has a wide frequency response range of 19-310Hz for handling all types of digital media.
    See all Subwoofer Speakers
    Top comment

    "I've heard many, many subs and SVS sounds better than all of them by a long shot. ...It is easy to set the subs volume to blend in with the front speakers."

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    Product Description

    Add thumping bass to a home theater with this 13.5-inch SVS subwoofer. Its 1200W RMS power delivers powerful sound, and its built-in amplifier is tuned specifically to the unit for optimal ground-shaking performance. This sealed-box SVS subwoofer has a wide frequency response range of 19-310Hz for handling all types of digital media.
    See all Subwoofer Speakers
    See all Subwoofer Speakers
  4. Samsung - HW-Q850D 7.1.2 Channel Q-Series Soundbar with Wireless Subwoofer and Rear Speakers, Dolby Atmos and Q-Symphony - Black - Front_Zoom
    Top comment

    "The sound is crisp and clear in both movies and on music streaming apps etc. The sub performs flawlessly and rattles the floor and I love it. ...Excellent surround sound, can adjust the speakers to be more rear biased just with the sub gave a little more bass"

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    Product Description

    This soundbar adapts rich, wireless audio to your space while staying in sync with your TV’s speakers* to amplify your experience.
    See all Sound Bars
    Top comment

    "The sound is crisp and clear in both movies and on music streaming apps etc. The sub performs flawlessly and rattles the floor and I love it. ...Excellent surround sound, can adjust the speakers to be more rear biased just with the sub gave a little more bass"

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    Product Description

    This soundbar adapts rich, wireless audio to your space while staying in sync with your TV’s speakers* to amplify your experience.
    See all Sound Bars
    See all Sound Bars
  5. LG - UltraGear 27" IPS UHD 1-ms FreeSync and G-SYNC Compatible Monitor with HDR (Display Port, HDMI) - Black - Front_Zoom
    Top comment

    "Better quality than the 27 inch version and amazing picture, better than Samsung g7 by miles....Any game I have played on this monitor has looked absolutely amazing and it plays really smooth. 27 inches for me is the perfect size for a gaming monitor and helps accommodate a multi-monitor set up which I use. "

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    Product Description

    The UltraGear 27GR93U gaming monitor is a battlestation centerpiece that combines performance, speed and loads of gaming-centric features. Gameplay looks amazing on the large 27” UHD (3840 x 2160) IPS display showcasing vivid color and contrast with DCI-P3 95% (Typ.) color gamut and VESA DisplayHDR 400. With a 144Hz refresh rate along NVIDIA G-SYNC compatibility¹ and AMD FreeSync Premium the on-screen action is ultra-responsive and buttery smooth with reduced motion blur. With aesthetic touches like a 3-side virtually borderless design along with tilt, heigh and pivot adjustability, this UltraGear monitor is the gaming screen upgrade you’ve been waiting for.
    See all Gaming Monitors
    Top comment

    "Better quality than the 27 inch version and amazing picture, better than Samsung g7 by miles....Any game I have played on this monitor has looked absolutely amazing and it plays really smooth. 27 inches for me is the perfect size for a gaming monitor and helps accommodate a multi-monitor set up which I use. "

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    Product Description

    The UltraGear 27GR93U gaming monitor is a battlestation centerpiece that combines performance, speed and loads of gaming-centric features. Gameplay looks amazing on the large 27” UHD (3840 x 2160) IPS display showcasing vivid color and contrast with DCI-P3 95% (Typ.) color gamut and VESA DisplayHDR 400. With a 144Hz refresh rate along NVIDIA G-SYNC compatibility¹ and AMD FreeSync Premium the on-screen action is ultra-responsive and buttery smooth with reduced motion blur. With aesthetic touches like a 3-side virtually borderless design along with tilt, heigh and pivot adjustability, this UltraGear monitor is the gaming screen upgrade you’ve been waiting for.
    See all Gaming Monitors
    See all Gaming Monitors
  6. Acer - Nitro KG272U Pbmiipx 27" LED WQHD FreeSync Gaming Monitor (HDMI, DP) - Black - Front_Zoom
    Top comment

    "Was a great upgrade from my 24 inch . Great for FPS...The 170Hz overcloocking doesnt seem to function but for sub $200 monitor with WQHD display at 144Hz and great colours which is suitable for all work, movie, game seem worth enough."

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    Product Description

    In competitive gaming, every frame matters. Introducing Acer's KG272U gaming monitor - the WQHD (2560 x 1440) resolution monitor that can keep up with your game play. Through AMD FreeSync Premium technology, the game’s frame rate is determined by your graphics card, not the fixed refresh rate of the monitor, giving you a serious competitive edge. Plus, users can enjoy comfortable viewing experience while gaming via flicker-less, low dimming and ComfyView display. The design saves space on your desk and lets you place multiple monitors side by side to build a seamless big-screen display.
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    Top comment

    "Was a great upgrade from my 24 inch . Great for FPS...The 170Hz overcloocking doesnt seem to function but for sub $200 monitor with WQHD display at 144Hz and great colours which is suitable for all work, movie, game seem worth enough."

    See all customer reviews

    Product Description

    In competitive gaming, every frame matters. Introducing Acer's KG272U gaming monitor - the WQHD (2560 x 1440) resolution monitor that can keep up with your game play. Through AMD FreeSync Premium technology, the game’s frame rate is determined by your graphics card, not the fixed refresh rate of the monitor, giving you a serious competitive edge. Plus, users can enjoy comfortable viewing experience while gaming via flicker-less, low dimming and ComfyView display. The design saves space on your desk and lets you place multiple monitors side by side to build a seamless big-screen display.
    See all Gaming Monitors
    See all Gaming Monitors
  7. KEF - Q series 5-1/4" Passive 2-Way Center-Channel Speaker - Black - Front_Zoom
    Top comment

    "This doesn't add as much I as I thought it would to my 2.1 setup of KEF q350 and Klipsch 10" sub (along with Sony receiver) Was expecting something more noticeable to be honest."

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    Product Description

    Upgrade the way you listen to your favorite tracks with this black KEF Q Series center channel speaker. The 5.25-inch low-frequency driver with matching radiators delivers deep bass, while the 1-inch dome tweeter ensures clear high-frequency notes. This KEF Q Series center channel speaker has surround and rear suspension to reduce interference.
    See all Center-Channel Speakers
    Top comment

    "This doesn't add as much I as I thought it would to my 2.1 setup of KEF q350 and Klipsch 10" sub (along with Sony receiver) Was expecting something more noticeable to be honest."

    See all customer reviews

    Product Description

    Upgrade the way you listen to your favorite tracks with this black KEF Q Series center channel speaker. The 5.25-inch low-frequency driver with matching radiators delivers deep bass, while the 1-inch dome tweeter ensures clear high-frequency notes. This KEF Q Series center channel speaker has surround and rear suspension to reduce interference.
    See all Center-Channel Speakers
    See all Center-Channel Speakers
  8. AudioControl - 2-Channel Active Line Output Converter with AccuBASS - Black - Front_Zoom
    Top comment

    "Excellent device has my stock stereo sounding stronger now with aftermarket subs...Just what i needed for my original stereo to add subs"

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    Product Description

    Easily add an aftermarket amplifier or subwoofer to your vehicle’s factory audio system with this 2-Channel Active Line Output Converter with AccuBASS by AudioControl. The LC2i converts speaker-level (high-level) audio signals to RCA preamp (low-level) signals so you can install an aftermarket amplifier or subwoofer without replacing your factory radio. This two-channel line output converter also features AccuBASS technology so you can turn up the volume without losing bass.
    See all Car Equalizers & Processors
    Top comment

    "Excellent device has my stock stereo sounding stronger now with aftermarket subs...Just what i needed for my original stereo to add subs"

    See all customer reviews

    Product Description

    Easily add an aftermarket amplifier or subwoofer to your vehicle’s factory audio system with this 2-Channel Active Line Output Converter with AccuBASS by AudioControl. The LC2i converts speaker-level (high-level) audio signals to RCA preamp (low-level) signals so you can install an aftermarket amplifier or subwoofer without replacing your factory radio. This two-channel line output converter also features AccuBASS technology so you can turn up the volume without losing bass.
    See all Car Equalizers & Processors
    See all Car Equalizers & Processors
  9. Hisense - 5.1.2 Dolby ATMOS  Soundbar with Wireless Rear Satellite Speakers & Wireless Subwoofer - Black - Front_Zoom
    Top comment

    "I would prefer a bit more sound out of the satellite speakers. Sub sounds good though....I read reviews and it gave me high hopes for this soundbar and sub. You can barely hear the sub even at max. I was replacing a samsung soundbar but I am returning this one tomorrow. "

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    Product Description

    Upgrade your audio experience with the AX5125H 5.1.2 channel soundbar and wireless subwoofer. The AX5125H’s 500 watts of sound fills the room with a 9-speaker array that also projects sound overhead, utilizing Dolby Atmos to create an immersive, surround sound experience. 7 audio enhancement modes, including news, movie, sports, game, and night modes, optimize sound specifically to the content or time of day. And eARC provides a simple one-cable connection with the included HDMI cable. Bluetooth audio makes it easy to connect your phone, tablet or laptop wireless to enjoy music and more.
    See all Sound Bars
    Top comment

    "I would prefer a bit more sound out of the satellite speakers. Sub sounds good though....I read reviews and it gave me high hopes for this soundbar and sub. You can barely hear the sub even at max. I was replacing a samsung soundbar but I am returning this one tomorrow. "

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    Product Description

    Upgrade your audio experience with the AX5125H 5.1.2 channel soundbar and wireless subwoofer. The AX5125H’s 500 watts of sound fills the room with a 9-speaker array that also projects sound overhead, utilizing Dolby Atmos to create an immersive, surround sound experience. 7 audio enhancement modes, including news, movie, sports, game, and night modes, optimize sound specifically to the content or time of day. And eARC provides a simple one-cable connection with the included HDMI cable. Bluetooth audio makes it easy to connect your phone, tablet or laptop wireless to enjoy music and more.
    See all Sound Bars
    See all Sound Bars
  10. Samsung - HW-Q930D/ZA 9.1.4 Channel Q-Series Soundbar with Wireless Subwoofer and Rear Speakers, Dolby Atmos and Q-Symphony - Black - Front_Zoom
    Top comment

    "The soundbar is about 44 inches wide which is as wide as a 50" TV. It has four different sound modes: Surround, Game, Standard, and Adaptive. ...You can adjust the volume separately for the soundbar, sub and rear speakers as well. The volume control goes to 100 but the highest I’ve had so far is only 25. "

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    Product Description

    This smart soundbar features booming speakers, wireless surround sound and crystal clear audio that is synchronized with your TV’s speakers* to amplify your favorite content. *Q-Symphony requires a compatible 2020-2024 Samsung TV. Please refer to samsung.com for more information. **Compatible with select 2022-2024 Samsung TVs.
    See all Sound Bars
    Top comment

    "The soundbar is about 44 inches wide which is as wide as a 50" TV. It has four different sound modes: Surround, Game, Standard, and Adaptive. ...You can adjust the volume separately for the soundbar, sub and rear speakers as well. The volume control goes to 100 but the highest I’ve had so far is only 25. "

    See all customer reviews

    Product Description

    This smart soundbar features booming speakers, wireless surround sound and crystal clear audio that is synchronized with your TV’s speakers* to amplify your favorite content. *Q-Symphony requires a compatible 2020-2024 Samsung TV. Please refer to samsung.com for more information. **Compatible with select 2022-2024 Samsung TVs.
    See all Sound Bars
    See all Sound Bars
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