It makes sense comparing VIZIO SB4451-C0 vs LG SL9YG because they both are able to give some premium features. Based on our rating, SB4451-C0 has a total rating of 7.2 out of 10 versus 8 for SL9YG. The competitors' control buttons are different: power, input, Bluetooth, volume down, volume up 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 SB4451-C0 has 5.1 versus 4.1.2 for the LG SL9YG. Competitors do not have a built-in subwoofer. Rivals have wireless connection to separate subwoofer. Both models received our 8 rating of 10 for their audio features and specs. Spotify is available on each of the soundbars.
These models have the ability to connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. The VIZIO SB4451-C0 has 1/0 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 SB4451-C0 received a rating of 8/10 versus 7/10, respectively. App control is available in every soundbar. A built-in microphone is present only on the SL9YG. Multi-room is available to every soundbar.
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 SB4451-C0 got a rating of 4, and LG SL9YG 8 out of 10.