LG HX906TX 3D Blu-Ray Home Theatre System comes with 4 units of Upright 3D Speakers have been added to conventional 5.1ch home theatre system to complete an all-around 9.1 Speaker system. By cascading sound throughout 9.1 speakers, the HX906TX delivers optimized, multi-directional sound closest to the acoustics of a concert hall or movie theatre. Get fully embraced by the true 360ï¿½ 3D sound coming from all around you. The 360ï¿½ Reflector inside the Upright 3D Speaker reflects sound to ceiling in all directions to further saturate the room with high density of sound, reproducing concert-hall like sound acoustics in your living room. The 3D Sound Analyser is LG's unique sound calibration algorithm, brings even the smallest detail in sound to life. It reinforces sound expression of a movie or music by analysing complex layers of original sound source, thereby delivering the most realistic 3D sound audio.