The Vizio M21d-H8 vs LG SC9S comparison shows that these models have some important differences and common features. The Vizio M21d-H8 was rated 5, while the LG SC9S has a rating 6.4.
Each of the models under consideration has active amplification type. By the number of channels, the devices do not differ. A built-in subwoofer is available only in the Vizio M21d-H8. Rate 5 out of 10 received the Vizio M21d-H8 for audio features and specs, but the LG SC9S received 6 out of 10.
The SC9S can play audio from Spotify.
Wireless Internet connection is realized only in the SC9S. Soundbars from this comparison have Bluetooth support. 1/1 HDMI inputs/outputs are in each of soundbars. As in the M21d-H8, so in the SC9S there is the HDMI Audio Return Channel (ARC). Connecting devices via USB is possible in both models. We rated the connectivity of the M21d-H8 at 6 out of 10, while the SC9S was rated 7/10. The manufacturer of the SC9S provides a device control application. The Vizio M21d-H8 equipped with a microphone. The models under consideration cannot become part of a multiroom system.
Dolby Atmos audio decoder is onboard the SC9S. The SC9S can work with surround sound due to DTS:X support. The same score of 5/10 was put to the soundbars for multichannel surround support.