VIZIO M512a-H6 vs LG SLM4R comparison definitely makes sense. Based on our rating, M512a-H6 has a total rating of 5.6 out of 10 versus 5.2 for SLM4R. The competitors' control buttons are different: power, source, demo, volume down, volume up and power, volume down, volume up, function, respectively.
Both soundbars have active amplification type. A significant difference between the units in the number of channels, the VIZIO M512a-H6 has 5.1.2 versus 4.1 for the LG SLM4R. Competitors do not have a built-in subwoofer. Rivals have wireless connection to separate subwoofer. The VIZIO M512a-H6 got our rating of 8 out of 10, and the LG SLM4R 7 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. Only the M512a-H6 supports HDMI Audio Return Channel (ARC). Both soundbars have a USB connector. For connectivity, the M512a-H6 received a rating of 8/10 versus 6/10, respectively.
App control is available for the SLM4R. None of the models under consideration have a built-in microphone. Soundbars do not have Multi-room support.
Only the M512a-H6 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the M512a-H6. For multichannel surround VIZIO M512a-H6 got a rating of 8, and LG SLM4R 5 out of 10.