Sound Ideas Surround Sound Effects collections are ambience tracks on steroids. Surround sound is a technique for enriching the sound reproduction quality of an audio source with additional audio channels from speakers that surround the listener (surround channels). Its first application was in movie theaters but its current applications are more widespread - which means that more and more productions need the ability to include surround sound in their repetoire. In addition to the standard left and right channels that provide stereo sound, surround sound adds one or more channels that are delivered from speakers behind the listener. Surround Sound collections, like the ones offered here, provide the audio for that array of speakers. These collections will help you produce distinctive and realistic audio backdrops for your 360 productions. You will find everything from subtle room tones to city streets, as well as low frequency growls, impacts and hums.