Vizio M21d-H8 vs Samsung Q990B comparison definitely makes sense. Based on our rating, M21d-H8 has a total rating of 5 out of 10 versus 9.8 for Q990B.
Both soundbars have active amplification type. A significant difference between the units in the number of channels, the Vizio M21d-H8 has 2.1 versus 11.1.4 for the Samsung Q990B. Only the Vizio M21d-H8 has a built-in subwoofer. The Vizio M21d-H8 got our rating of 5 out of 10, and the Samsung Q990B 10 for its audio features and specs.
Spotify support is available on the Q990B.
Only the Samsung Q990B can connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. The Vizio M21d-H8 has 1/1 HDMI inputs/outputs versus 2/1 of the Samsung Q990B. 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 10/10, respectively. App control is available for the Q990B. A built-in microphone is present in each model. Soundbars do not have Multi-room support.
Only the Q990B has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the Q990B. For multichannel surround Vizio M21d-H8 got a rating of 5, and Samsung Q990B 10 out of 10.