LG GX 3.1 Channel 420W Sound Bar with Subwoofer for Home Theatre Surround Sound, and Dolby AtmosThe LG GX Sound Bar creates home theater sound with more depth. Surround your senses while ideally matching the Gallery Design of the LG GX Series OLED TVs. Sound effects and soundtracks seem to come from every angle with 3. 1 channels, Dolby Atmos, and DTS: X. The wireless LG subwoofer combines with the sound bar's up firing front height channels to direct Hi Res Audio out and up, for sound that fills up any room. AI Sound Pro delivers optimal sound