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VIZIO M-Series All-in-One 2.1 Home Theater Sound Bar



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Product Description

Model #: M21d

The redesigned M-Series™ All-in-One 2.1 Home Theater Sound Bar from VIZIO, America’s #1 Sound Bar Company, combines supreme convenience with powerful performance.


  • Thrilling sound is achieved with separate tweeters and woofers, plus built-in dual 3” subwoofers, all in a striking angular shape with a dark charcoal finish. There are no additional speakers or cables needed.
  • HDMI connectivity offers the highest-quality audio with quick and easy setup, allowing you to control the sound bar with your TV remote. (HDMI and all audio cables included.)
  • 4K HDR content is enhanced with Dolby Audio™ for the highest-fidelity sound, and DTS® Virtual:X™ creates an immersive experience with room-filling, floor-to-ceiling, virtualized 3D sound that transforms music into a live concert, or a sci-fi film into an intergalactic adventure.
  • The M-Series™ All-in-One features the all-new Voice Assistant Input that gives you the convenience of a voice assistant you are already accustomed to (sold separately) and lets you operate it right through the sound bar for upgraded audio.
  • You can also wirelessly connect your phone or any compatible Bluetooth device for high-quality music streaming.
  • The VIZIO M-Series All-in-One Sound Bar is a hassle-free, plug-and-play audio solution that does the job of many speakers, turning your living room into a captivating home theater.


  • Tech Data:
    • Total Number of Speakers: 6
    • Speaker Channels: 2.1
    • Subwoofer Size (inches): 3.0
    • Subwoofer Size (cm): 7.62
    • Subwoofer Size (mm): 76.2
    • Number of Subwoofers: 2
    • Subwoofer Frequency Response: 50Hz
    • System Frequency Response: 50Hz - 20kHz
    • Sound Pressure Level (dB): 98
    • DTS TruVolume: Yes
    • Remote Control: Yes
    • Remote Control Type: Standard
    • Wall Mountable: Yes
    • DTS Virtual:X: Yes
  • Sound Bars:
    • Sound Bar Length (inches): 36.0
    • Sound Bar Length (cm): 91.44
    • Sound Bar Length (mm): 914.4
    • Sound Bar Speaker Size (cm): 0.00
    • Sound Bar Speaker Size (mm): 0.0
    • Sound Bar Buttons: Power, Input, Bluetooth, Volume UP, Voulme DOWN
    • Speaker Height: (cm): 0.00
    • Speaker Diameter (cm): 0.00
    • Sound Bar Speaker Size (cm): 0.00
    • Sound Stand Size (cm): 0.00
    • Sound Stand Speaker Size (cm): 0.00
  • Inputs:
    • Analog 3.5mm stereo mini jack: Yes
    • Optical (Toslink): Yes
    • USB (for. WAV Audio Playback): Yes
    • Blutetooth: Yes
    • HDMI: Yes
    • IR Receiver: Up to 30 feet
  • Outputs:
    • HDMI ARC: Yes
  • Power:
    • Standby Power Consumption: <1W
    • Power Frequnecy: 120V-240V / 50-60Hz
  • Custom Attributes:
    • HDMI Ports: 2 (1In/1 Out)


Bluetooth Enabled:
Number of HDMI Outputs:
Number of USB Ports:
Additional Accessories Included:
remote control, HDMI and all audio cables included
Model Number:
Manufacturer's Warranty:
1 Year
Connection Type:
3.5mm audio, HDMI, Optical Digital Audio, USB
Multimedia Keys:
Power, Input, Bluetooth, Volume UP, Voulme DOWN
Operating System Compatibility:
Amazon Alexa, Google Assistant, Siri

Ask a Question

Q: I have 2 questions for you first one is can you tell me how many watts it is? And the second one is can you please tell me since it's considered low profile can you tell me in inches how high it is? Thank you so much for your help in this matter!

daddydude 6 months ago


203 Reviews
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5 Stars 148
4 Stars 40
3 Stars 4
2 Stars 3
1 Star 8
90.0% of reviewers would recommend this product to a friend
Top Reviews All Reviews
Fantastic Sound
5 days ago
Thought the sound that I had in the beginning was good but after changing to the Vizio M Series Sound Bar..the sound is so deep and rich...I hear the back ground sounds that I didn't hear berore.
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Fantastic Sound
8 days ago
Owned for months. Used with Bluetooth from phone, primarily via HDMI from TV. Have experienced issues with losing control of speakers via Bluetooth to something else that I can't identify. Bar switched into demo mode and I had to contact the very helpful tech support via chat and we were able to successfully reset it and I have had no trouble since.
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Big Sound In a Small Package
13 days ago
You have to hear it to believe it. I bought this to go with my M-Series TV. The sounds is amazing and I'm happy with my purchase.
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Mala calidad
24 days ago
Solo funciono dos meses ya no funciona ningún puerto ni el control y menos los botones laterales
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I’m in love for the first time in my life!!
26 days ago
I’ve had one of the first flat screens by Vizio from December 2006! Omg! It finally started to not function properly so I upgraded from that little 32” to a 70” and sweet diggity dawgs! I’m in love, love LOVE!!! I’ve got my own IMAX personal theatre! Hahaha! I loved this brand. My little first flat screen lasted me 14 years. I’m so happy with all the updated technology and I got the matching soundbar a month later! Literally everything is plug and play, so easy to set stuff up. Note: I lugged the 70” from the store to my car then upstairs to my apartment THEN a week later (I had to rest) I set it up, all by myself! It took a bit of maneuvering but I put it on top of my new entertainment center I put together, very carefully. Upgrade! You’ll be so happy!
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Great sound bar for the price.
1 month ago
The sound bar were great from day one. It was very easy to connect up to a smart TV. All functions work using HDMI cable. I did go over to use a fiber optic cable but found the sound intensity display on the TV no longer worked. Not a big deal but maybe something they can work on in the future. I am sticking with the fiber optic which is the best.
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Good, but only after VIZIO Firmware download!
2 months ago
When I initially bought this sound bar, it sounded great, but there was a clear video-to-voice lag when watching Blu-ray and chrome-cast. I tried everything to improve it, and was ready to return it after a week, until I found that there was a VIZIO firmware update in April 2021 to fix this issue. After the fix, it worked fine. so therefore I am rating it 4 stars.
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Wii not actvate
2 months ago
So far not much to comment on since it is not producing any audio.
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Great Sound Quality
2 months ago
The new flat screen TV I recently purchased had poor to fair sound quality. Many times it was difficult to hear and understand low frequency tones. This sound bar significantly improved audio output such that I can clearly hear and understand all words and sounds. The theater sound quality is an added bonus.
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2 months ago
Great sound range for a small system; Added benefit, for me, is that is a low profile enclosure
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1 - 10 of 198 Reviews

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