Product Comparison: VIZIO SB3821-D6 vs VIZIO SB3621n-E8

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General Specifications
About the Product
Introducing the all-new VIZIO Smart Cast 38” 2.1 Sound Bar System. The included wireless subwoofer together with the 2-channel sound bar deliver immersive surround sound at levels up to 100 dB1. Download the VIZIO Smart Cast app2 to turn your mobile device into the ultimate remote and discover music across multiple apps at once.
Introducing the all-new VIZIO 36 2.1 Sound Bar System that instantly upgrades your home theater experience. TV shows, movies, and sport games are enhanced with a room-filling audio experience with a wireless subwoofer for booming bass. It's Bluetooth compatible so you can stream music from your mobile device in high quality, too.
Key Specs
Minimum Frequency Response
50 Hz
50 Hz
Maximum Frequency Response
20 kHz
20 kHz
Power Output
100 Watt
What customers say about "Key Specs"
VIZIO SB3821-D6 SmartCast 38-Inch 2.1 Channel Sound Bar with Wireless Subwoofer
  • Outstanding sound, great frequency response, great intelligibly, right amount of low energy from the sun.
  • Sound is great, the bass is nice, and the subwoofer does the job. I'd say for the money this product can't be beat.
  • I love it, it’s perfect. Definitely recommend it, room filling clear sound and bass to spare.
  • Nice, the sound fills the space like a movie theater, terrific! It surely compliments my 70 inch flat screen. The price is terrific well worth the money sounds like an expensive.
  • Just out of the 1 year warranty period, some of the speakers began to rattle in certain frequencies at medium volumes. I don't run them hot or high ever, so this was a surprise to me.
VIZIO SB3621n-E8 2.1 Channel Soundbar System - Bluetooth Enabled - Wireless Subwoofer
  • Sound bar has clear dialogue (my hearing is not the best at 70); plenty of distortion free decibels when needed and low enough profile as to not interfere with TVs ir/rf window.
  • I have a vaulted living room and the SB3621 fills it with wonderful highs and deep bass response. Really brings the flat screen TV sound to life.
  • Awesome sounds!!! Subwoofer is for real. High - highs and low lows and everything in between.
  • It sounds really fantastic at higher volumes, but at lower volumes certain frequencies noticeably clip in and out, which is annoying.
  • The mid range out of the center speaker is hollow and tinny sounding, regardless of settings used.
Size & Weight
3 in.
2.1 in.
38.2 in.
36 in.
3 in.
3.2 in.
5.8 lbs.
4.6 lbs.
What customers say about "Size & Weight"
VIZIO SB3821-D6 SmartCast 38-Inch 2.1 Channel Sound Bar with Wireless Subwoofer
  • This little fella packs an AMAZING punch. In fact, I had to move the woofer over next to the soundbar because the "full surround sound" was making my ears pop.
  • Love the ease of install and setup for the sound bar. I bought the upgrade to the sub and it’s very impressive for the cost and size!!
  • I was replacing an older Vizio soundboard that died after 8 years. This model is a very good replacement. It has better sound and the subwoofer is surprisingly good for the size.
  • Wow is all I can say! Granted, it's only 2.1, but that little subwoofer punches above its weight.
  • Great sound and great bass, fits well in my room, convinient size. Highly recommended.
VIZIO SB3621n-E8 2.1 Channel Soundbar System - Bluetooth Enabled - Wireless Subwoofer
  • Sub is just 51/2 inches but base is very good, once again, excellent for its size.
  • Pretty satisfied with the performance, ease of use, and size of the unit.
  • This sound system is perfect for a medium size theatre room. This is my second vizio soundbar and I will probably be sticking with them from here on out.
  • I have a good sized open space living room/dining room/kitchen and this sound bar filled the room fantastically. Easy to install and operate. Highly recommend in every aspect.
  • Love in a medium sized apartment with a small living room and this unit was perfect.
Installation Type
Stand-alone, Wall-mount
Stand-alone, Wall-mount
Number of Channels
Sound Enhancing System
Dolby Digital, DTS Studio Sound, DTS TruSurround, DTS TruVolume
Dolby Digital, DTS Studio Sound, DTS TruSurround, DTS TruVolume
Bass you can feel, Google Cast, DTS audio technologies, Dolby audio technologies
Simple setup, 3 months of TIDAL HiFi Music Service – FREE, America's #1 sound bar company
What customers say about "Features"
VIZIO SB3821-D6 SmartCast 38-Inch 2.1 Channel Sound Bar with Wireless Subwoofer
  • It's easy to play with the equalizer & customize your sound. Yes, it supports bluetooth.
  • This system really is deceiving, easy hook up, easy to navigate, very good sound system for the price. I was pleased with this system.
  • Easy to hook up and includes everything you need as long as its under 3 feet. Helps greatly with dialogue especially for older people.
  • The sound quality on this sound bar is incredible. Easy to install components and easy to set up the Vizio app on an Android 9 based Google pixel phone.
  • Remote control responsiveness is pretty poor. The cast app doesn't do much useful imo, but you can cast to it via standard protocols like google cast.
VIZIO SB3621n-E8 2.1 Channel Soundbar System - Bluetooth Enabled - Wireless Subwoofer
  • All settings and functions work well except I have not used BT with my iPhone but expect it to work well.
  • Great sound bar for the price! Easy installation. Received product quickly and as advertised.
  • I think it was was worth it. Sound is really good. Easy to set up and operate.
  • The sound bar was very easy to install and set up and It has great sound. Also very easy to setup up smart phones to connect and play music.
  • The only problem I have is the LED display for the different functions of the bar. Plenty bright enough but it’s like Morse Code.
Equalizer Settings
Subwoofer level mode, Bass/Tremble control
Movie, Music
Wireless Connectivity
Stereo RCA, 3.5mm stereo mini jack, RCA (Coaxial / SPDIF), Optical (Toslink), USB (for .WAV Audio Playback), RJ45 jack
Analog audio, USB (for .WAV Audio Playback), RCA (Coaxial), Optical (Toslink)
What customers say about "Connectivity"
VIZIO SB3821-D6 SmartCast 38-Inch 2.1 Channel Sound Bar with Wireless Subwoofer
  • I have it connected with a 6ft Amazon Basics optical cable, and there is no sound delay.
  • The main speaker unit has multiple connections in and is wireless/bluetooth with the app support so you can control it with your phone or tablet.
  • First sound bar I’ve ever owned, but the sound quality is excellent. Has great bass. Love connecting it via Bluetooth to my iPhone to listen to music also.
  • The sound is good, as is the price. However, the sound keeps dropping out. Both the bluetooth and the hardwire connection continually just drops out arbitrarily.
  • The bass is very distorted, often disconnects from Bluetooth, and it’s virtually impossible to control unless you have the app on your phone.
VIZIO SB3621n-E8 2.1 Channel Soundbar System - Bluetooth Enabled - Wireless Subwoofer
  • Very easy connect, very good sound, excellent for the price. Defenitely recommended!
  • Plug In the power cables, connect the optical to the TV, and voila! This Vizio booted up on its own and the sound quality is amazing.
  • Visio SB3621 has great sound for the money whether used in conjunction with my flat screen TV or streaming music via Bluetooth.
  • Connecting is just ok. It’s plug and play and then you just hit the proper setting in the remote to the input you need. Good to go.
  • Took 3 minutes to hook up and turn on. Bluetooth also works seamlessly from my phone.
Warranty / Certifications
Manufacturer Warranty
1 year(s)
1 year(s)
Other Information
219.99 $
149.99 $

Other reviews