It makes sense comparing Vizio V51-H6 vs LG SL9YG because they both are able to give some premium features. Based on our rating, V51-H6 has a total rating of 6 out of 10 versus 8 for SL9YG. The competitors' control buttons are different: power, volume down, volume up, source, Bluetooth and power, volume down, volume up, play/pause, microphone, respectively.
Both soundbars have active amplification type. A significant difference between the units in the number of channels, the Vizio V51-H6 has 5.1 versus 4.1.2 for the LG SL9YG. Competitors do not have a built-in subwoofer. The V51-H6 has a wired and wireless connection to separate subwoofer, and the SL9YG - wireless. The Vizio V51-H6 got our rating of 7 out of 10, and the LG SL9YG 8 for its audio features and specs.
Soundbars do not have AirPlay support. Spotify support is available on the SL9YG.
Only the LG SL9YG can connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. The Vizio V51-H6 has 0/1 HDMI inputs/outputs versus 1/1 of the LG SL9YG. The HDMI Audio Return Channel (ARC) feature supports both devices. Both soundbars have a USB connector. For connectivity, the V51-H6 received a rating of 6/10 versus 7/10, respectively.
App control is available in every soundbar. A built-in microphone is present in each model. Multi-room is only available for the LG SL9YG.
Only the SL9YG has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the SL9YG. For multichannel surround Vizio V51-H6 got a rating of 5, and LG SL9YG 8 out of 10.