LG S90QY vs Sony HT-S400 comparison definitely makes sense. Based on our rating, S90QY has a total rating of 8 out of 10 versus 4.4 for HT-S400.
Both soundbars have active amplification type. A significant difference between the units in the number of channels, the LG S90QY has 5.1.3 versus 2.1 for the Sony HT-S400. The output power is different and equal to 440 (overall) W for the S90QY versus 330 (overall) W for the HT-S400. Competitors do not have a built-in subwoofer. Rivals have wireless connection to separate subwoofer. The LG S90QY got our rating of 8 out of 10, and the Sony HT-S400 6 for its audio features and specs.
Spotify support is available on the S90QY.
Only the LG S90QY can connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. The LG S90QY has 1/1 HDMI inputs/outputs versus 0/1 of the Sony HT-S400. The HDMI Audio Return Channel (ARC) feature supports both devices. Both soundbars have a USB connector. For connectivity, the S90QY received a rating of 8/10 versus 7/10, respectively.
Compared soundbars have no app control. None of the models under consideration have a built-in microphone. Soundbars do not have Multi-room support.
Only the S90QY has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the S90QY. For multichannel surround LG S90QY got a rating of 10, and Sony HT-S400 5 out of 10.