The LG S77S is a 3.1.3 channel soundbar delivering 400 watts of immersive home theater audio. It features a wireless subwoofer and three up-firing height channels, including an industry-exclusive up-firing center channel designed to enhance dialogue clarity alongside the traditional front-firing center speaker. The result is a wider, richer soundstage that fills your room with Dolby Atmos and DTS:X spatial audio, flowing all around and overhead.

Triple Level Spatial Sound creates a virtual audio dome for a more cinematic experience, while Clear Voice Plus intelligently analyzes audio output to keep conversations crisp and intelligible through the center speakers. WOW Orchestra pairs the soundbar with compatible LG TVs to combine both speaker systems simultaneously for the ultimate listening experience, and WOW Interface lets you control both devices with a single remote. AI Sound Pro automatically decodes and optimizes content up to 7.1.4 channels, with additional sound modes including Cinema, Music, Sports, Game, and Bass Blast+.

Connectivity includes HDMI eARC/ARC with 4K passthrough at up to 120Hz with VRR and ALLM support for smooth, lag-free gaming, as well as optical input, Bluetooth, and USB media playback. The soundbar supports High Resolution Audio up to 24-bit/96kHz and passes through Dolby Vision and HDR10 video signals (HDCP 2.3). Bass and treble adjustments are available, and the system can be controlled via the LG ThinQ iOS or Android app. The soundbar measures 35" x 2.5" x 4.9" and is recommended for TVs 40 inches and larger.