Border sound is a method for enriching the integrity and also depth of audio reproduction by utilizing multiple sound networks from audio speakers that surround the audience (surround networks). Its first application was in movie cinemas. Prior to surround sound, theater sound systems frequently had 3 display channels of noise that played from 3 speakers (left, center, and right) situated in front of the audience. Surround noise adds one or more networks from speakers sideways or behind the listener that have the ability to create the sensation of sound originating from any type of horizontal instructions (at ground degree) around the listener. Surround audio styles differ in reproduction as well as recording methods, together with the number as well as positioning of extra networks. The most common surround audio specification, the ITU's 5.1 standard, calls for 6 audio speakers: Center (C), before the audience; Left (L) and Right (R), at angles of 60 °; Left Surround (LS) as well