VIZIO SB3821-D6 SmartCast 38" 2.1 Channel Soundbar System

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VizioSKU: SB3821-D6

Sale price$284.99 Regular price$359.99
  • Shipping: FREE SHIPPING on orders $50+
  • Condition: New
    This product is brand new with a full manufacturer warranty
  • Warranty: 90 Day Manufacturer Warranty


VIZIO SB3821-D6 SmartCast 38" 2.1 Channel Soundbar System



Enhance your TV's audio with the VIZIO SmartCast 38" 2.1-Channel Soundbar System. It features a soundbar with 2.75" left and right drivers, plus a 5.25" wireless subwoofer for low bass impact. Its ability to decode Dolby and DTS signals is designed to improve the quality of your sound compared to your TV speakers.

The SmartCast 38" has Bluetooth connectivity for pairing with your compatible smart device and wirelessly streaming your audio content. Its wired connections include optical, 1/8", stereo RCA, USB, and digital coaxial inputs to support a variety of source types. It includes wall mount brackets for the soundbar, an IR remote control, and a number of cables for instant connectivity.


  • 2.1-Channel Configuration
  • Bluetooth Audio Streaming
  • External Wireless Subwoofer
  • Dolby and DTS Compatibility

Sound That Moves You

From the roar of a crowd to the screech of a car chase, experience every detail as loud as 100 dB with less than 1% total harmonic distortion.

Bass You Can Feel

From the rumble of a concert to the pulse of your party playlist, the wireless subwoofer delivers 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 soundbar from your mobile device using VIZIO SmartCast App.

VIZIO 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 soundbars or speakers from anywhere in your home.

Cast from Apps You Already Know and Love

The SmartCast 38" soundbar has Google Cast built-in, which allows you to cast your favorite content from your phone to your display or soundbar. Access millions of songs, podcasts, and more.


DTS audio technologies are designed to enable richer sound and dialogue with deeper bass.


Dolby audio technologies are designed to provide dynamic sound for your TV shows, movies, and music.

In the Box

  • VIZIO SmartCast 38" 2.1-Channel Soundbar System
  • Remote Control
  • 5' RCA to 1/8" Stereo Cable
  • 4' Optical TOSLINK Cable
  • 5' Digital Coaxial Cable
  • 4' Power Cord for Subwoofer
  • 8' Power Cord for Soundbar
  • Wall Mounts
  • Limited 1-Year Warranty


Channels 2.1
Drivers L/R: 2 x 2.75" (7 cm) drivers
  Subwoofer: 1 x 5.25" (13.3 cm) driver
Sound Pressure 100 dB
Frequency Response Soundbar: 50 Hz to 20 kHz
  Subwoofer: 50 Hz
Total Harmonic Distortion <1%
Audio Processing Dolby Digital, DTS Studio Sound, DTS TruSurround, DTS TruVolume
Inputs 1 x Stereo RCA
  1 x 1/8" (3.5 mm) stereo mini jack
  1 x Digital coaxial
  1 x Optical TOSLINK
  1 x USB (for .WAV audio playback only)
  1 x Ethernet LAN
Bluetooth Version 4.0 LE
Buttons Power, input, Bluetooth, volume up, volume down
Installation Tabletop and wall-mountable
Power Requirements 120 VAC, 60 Hz
Dimensions (W x H x D) Soundbar: 38.2 x 3 x 3" (97 x 7.6 x 7.6 cm)
  Subwoofer: 8.38 x 9.16 x 8.38" (21.3 x 23.3 x 21.3 cm)
Weight Soundbar: 5.8 lb (2.6 kg) with feet
  Subwoofer: 7 lb (3.2 kg)
Packaging Info
Package Weight 18 lb
Box Dimensions (LxWxH) 40 x 15 x 10"


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