I had a chance to test and compare two models: VIZIO SB3821-C6 vs Vizio V21-H8 and this review should help people who are looking for a good soundbar. The VIZIO SB3821-C6 was rated 4.5, while the Vizio V21-H8 has a rating 5.5. The soundbars are equipped with a different number of buttons, power, input, Bluetooth, volume down, volume up for the SB3821-C6 and power, volume down, volume up, source, Bluetooth for the V21-H8.
Each of the models under consideration has active amplification type. By the number of channels, the devices do not differ. The built-in subwoofer is not implemented in any of these models. An external subwoofer connects to the SB3821-C6 via wireless, but V21-H8 has wired and wireless connection type. Rate 5 out of 10 received the VIZIO SB3821-C6 for audio features and specs, but the Vizio V21-H8 received 6 out of 10.
Soundbars do not have AirPlay support. The units in this comparison do not support Spotify.
Both models do not have a wireless Wi-Fi interface. Soundbars from this comparison have Bluetooth support. The HDMI Audio Return Channel (ARC) is implemented only in the V21-H8. Connecting devices via USB is possible in both models. The connectivity of each of the models was estimated at 6/10. The manufacturer of the V21-H8 provides a device control application. The Vizio V21-H8 equipped with a microphone. The models under consideration cannot become part of a multiroom system.
Dolby Atmos audio decoder support is not implemented in either the SB3821-C6 or V21-H8. Devices from this comparison cannot process surround sound due to lack of DTS:X. The same score of 5/10 was put to the soundbars for multichannel surround support.