VIZIO SmartCast™ 38” 2.1 Sound Bar System | SB3821-D6
Size: 38"
$219.99 Plus tax and shipping

VIZIO SmartCast 38” 2.1 Sound Bar System | SB3821-D6

VIZIO SmartCast 38” 2.1 Sound Bar System | SB3821-D6

$219.99 Plus tax and shipping
The All-New VIZIO SmartCast™ Sound Bars

Simply Immersive.

Introducing the all-new VIZIO SmartCast™ 38" 2.1 Sound Bar System. Combining high-caliber audio with elegant style, and Google Cast™ built in. What you love won't change, but how you experience it will never be the same.

Sound Bar Overview
100 dB
Sound That Moves You

From the roar of a crowd to the screech of a car chase, experience every detail in amazing clarity as loud as 100 dB2 with less than 1% Total Harmonic Distortion.

50 Hz
Bass You Can Feel.

From the rumble of a concert to the pulse of your party playlist, the wireless subwoofer delivers roof-shaking bass as deep as 50 Hz.

Experience VIZIO SmartCast

VIZIO SmartCast™ brings together your favorite entertainment into one simple experience. Discover, cast and control your music on your Sound Bar from your mobile device using VIZIO SmartCast™ App.1

Turn Your Phone Into The Ultimate Remote.

Easily set up and control your Sound Bar like never before with the VIZIO SmartCast™ App.1
Download for free on the App Store® and Google Play™.

SmartCast App

Download the VIZIO SmartCast™ app to turn your smartphone or tablet into a powerful touchscreen remote. Search and browse content across multiple apps at once. Control multiple VIZIO SmartCast™ sound bars or speakers from anywhere in your home.

SmartCast App Menus

GoogleCast Logo

Cast From Apps You Already Know and Love.

All VIZIO SmartCast™ audio products have Google Cast™ built in – the same technology behind Chromecast – which allows you to cast your favorite content from your phone to your TV / Display or Sound Bars. Access millions of songs, podcasts and more.

Elevated Engineering

VIZIO SmartCast™ Sound Bars are crafted with custom drivers and technologies from the industry leaders of audio.

Elevated Engineering Sound Bar
DTS Digital Surround

DTS® audio technologies enable richer sound and dialogue with deeper bass.

Dolby Audio

Dolby® audio technologies deliver dynamic sound to your TV shows, movies and music.

— One (1) year limited warranty. We stand firmly behind our products with a one year service warranty and lifetime technical support. Extended warranties of 2-5 years are available. Visit us online at or call (877) 698-4946.
— © 2016 VIZIO, Inc. Vizio, the V logo, and other terms and logos are trademarks or registered trademarks of vizio, Inc. all other trademarks and logos are property of their respective owners. All rights reserved.
— For DTS patents, see Manufactured under license from DTS Licensing Limited. DTS, DTS logo, & DTS and DTS logo together are registered trademarks of DTS, Inc., DTS TruVolume™, DTS TruSurround™ and DTS Studio Sound™ are registered trademark of DTS, Inc. © DTS, Inc. All Rights Reserved. Dolby and the Dolby-D Symbol are registered trademarks of Dolby Laboratories. HDMI, HDMI high-definition multimedia interface, and the hdmi logo are trademarks or registered trademarks of hdmi licensing LLC. The Bluetooth ® word mark and logos are registered trademarks owned by Bluetooth sig, inc. used under license. Dolby and the double-D symbol are registered trademarks of Dolby laboratories. © 2016 Google Inc. all rights reserved. Android, Google Play, and Google Cast are trademarks of Google Inc.
— The applications and content of the applications pictured herein or described in accompanying documentation may only be available in certain countries or languages, may require additional fees or subscription charges, and may be subject to future updates, modifications or discontinuation without notice. Vizio has no control over third party applications or content and assumes no responsibility for the availability or interruption of such applications or content. Additional third party terms, conditions and restrictions apply. High speed/broadband internet service and access equipment are required and are not provided by vizio. Google account required to download apps from the google play store.
—  *Sound pressure level measured using pink noise at 1 meter, c-weighted.
—   1Minimum requirements: Android 4.0 or later (to use the Bluetooth functionality you must have android™ 5.1 or later), IOS 8.0 or later, subject to change. For a list of Android™ devices supported, see the Supported Devices article. IOS devices supported: Iphone, Ipad.

VIZIO, Inc. has made every effort to ensure the accuracy of the information provided herein. All product specifications, functionality, features, configurations, performance, design and other product information described herein are subject to change without notice. VIZIO, Inc. disclaims liability for typographical, technical, or descriptive errors.

Tech Specs

  • Sound Bar Size38"
  • Sound Bar SpeakersLeft & Right: 2.75"
  • Subwoofer Speaker Size5.25"
  • Subwoofer Frequency Response50-90 Hz
  • System Frequency50 Hz - 20 kHz
  • Sound Pressure Level100 dB
  • Sound Enhancement TechnologyDolby Digital®, DTS Studio Sound™, DTS TruSurround™, DTS TruVolume™
  • Sound Bar ButtonsPower, Input, Bluetooth, Volume Up, Volume Down
  • RemoteYes
  • InstallationTable Top and Wall-Mountable
  • Package ContentsSound Bar, Wireless Subwoofer, 5' RCA to 3.5mm Stereo Mini Jack, 4' Optical Cable (Toslink), 5' Digital 75 ohm coaxial cable with RCA, 4' Power Cord for Subwoofer, 8' Power Cord for Sound Bar, Wall Mounts, Remote, Quick Start Guide


  • Analog Audio InputStereo RCA
  • Analog Audio Input3.5mm stereo mini jack
  • Digital Audio InputRCA (Coaxial / SPDIF)
  • Digital Audio InputOptical (Toslink)
  • USB InputUSB (for .WAV Audio Playback)
  • Bluetooth® InputBluetooth 4.0 LE
  • Ethernet InputRJ45 jack
  • IR ReceiverUp to 30 feet

Dimensions and Weight

  • Sound Bar Dimensions38.2”W x 3”H x 3”D
  • Product with Feet Weight5.8 lbs
  • Subwoofer Dimensions8.38”W x 9.16”H x 8.38”D
  • Subwoofer Weight7 lbs
  • Product Packaging Dimensions10.5”W x 40.25”H x 15.5”D
  • Product Packaging Weight17 lbs

VIZIO Warranty

  • WarrantyOne Year Parts & Labor. Free Lifetime Technical Support.

Support Links

Contact Support

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