LG SN9YG vs LG SLM4R comparison definitely makes sense. Based on our rating, SN9YG has a total rating of 7 out of 10 versus 5.2 for SLM4R. The competitors' control buttons are different: power, volume down, volume up, function, play/pause, microphone 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 LG SN9YG has 5.1.2 versus 4.1 for the LG SLM4R. The output power is different and equal to 520 (overall) W for the SN9YG versus 420 (overall) W for the SLM4R. Competitors do not have a built-in subwoofer. Rivals have wireless connection to separate subwoofer. The LG SN9YG 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.
Only the LG SN9YG can connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. Only the SN9YG supports HDMI Audio Return Channel (ARC). Both soundbars have a USB connector. For connectivity, the SN9YG received a rating of 8/10 versus 6/10, respectively. App control is available in every soundbar. A built-in microphone is present only on the SN9YG. Soundbars do not have Multi-room support.
Only the SN9YG has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the SN9YG. For multichannel surround LG SN9YG got a rating of 10, and LG SLM4R 5 out of 10.