Vizio M21d-H8 vs Sony HT-S400 comparison definitely makes sense. Based on our rating, M21d-H8 has a total rating of 5 out of 10 versus 4.4 for HT-S400.
Both soundbars have active amplification type. Soundbars have the same number of channels on 2.1. Only the Vizio M21d-H8 has a built-in subwoofer. The Vizio M21d-H8 got our rating of 5 out of 10, and the Sony HT-S400 6 for its audio features and specs.
Soundbars do not have AirPlay support. Spotify support not implemented in both soundbars.
Both models do not have WI-FI support. Rivals from our review have Bluetooth support. The Vizio M21d-H8 has 1/1 HDMI inputs/outputs versus 0/1 of the Sony HT-S400. The HDMI Audio Return Channel (ARC) feature supports both devices. Both soundbars have a USB connector. For connectivity, the M21d-H8 received a rating of 6/10 versus 7/10, respectively. Compared soundbars have no app control. A built-in microphone is present only on the M21d-H8. Soundbars do not have Multi-room support.
None of soundbars equipped with Dolby Atmos multichannel audio decoder. The soundbars do not support the surround sound technology DTS:X. For multichannel surround, each of the opponents received 5 points out of 10.