The Vizio M21d-H8 vs VIZIO SB46514-F6 comparison proves that these soundbars have many common features. Based on our rating, M21d-H8 has a total rating of 5 out of 10 versus 7.6 for SB46514-F6. The competitors' control buttons are different: power, volume down, volume up, source, Bluetooth and power, volume down, volume up, input, Bluetooth, respectively.
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 5.1.4 for the VIZIO SB46514-F6. Only the Vizio M21d-H8 has a built-in subwoofer. The Vizio M21d-H8 got our rating of 5 out of 10, and the VIZIO SB46514-F6 7 for its audio features and specs. Spotify support not implemented in both soundbars.
Only the VIZIO SB46514-F6 can connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. Each soundbar has 1/1 HDMI inputs/outputs. 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 8/10, respectively.
App control is available for the SB46514-F6. A built-in microphone is present in each model. Multi-room is only available for the VIZIO SB46514-F6.
Only the SB46514-F6 has a Dolby Atmos multichannel audio format support. The soundbars do not support the surround sound technology DTS:X. For multichannel surround Vizio M21d-H8 got a rating of 5, and VIZIO SB46514-F6 7 out of 10.