3.1 channel audio delivers immersive surround sound with detailed, powerful performance Centre channel speaker delivers crisp, clear dialogue, making it easy to hear voices in movies, shows, and games 360 spatial sound mapping delivers next-level immersive, cinematic sound Sound Field Optimization ensures movie theatre-style surround sound for everyone, regardless of the room acoustics DSEE (Digital Sound Enhancement Engine) improves the quality of compressed low-quality audio files Supports Dolby Atmos and DTS:X for cinematic, three‑dimensional surround sound Bluetooth lets you wirelessly stream music from a variety of compatible devices Bravia Connect app makes it easy to control setup and customize settings Required accessories (sold separately) HDMI or optical digital cable, depending on how you're connecting the sound bar to the TV