The "AC3" tag often found on media files refers to the Audio Codec 3 format. This is the industry standard for 5.1 channel surround sound , which allows for a more immersive viewing experience, particularly for the atmospheric sounds of the Australian jungle.
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Lindner, C. (2013). I'm a Celebrity... Get Me Out of Here!: The Psychology of Reality TV. London: IB Tauris. The "AC3" tag often found on media files