sensurround

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Sensurround is an audio process developed in the 1970s by Universal Studios for the presentation of theatrical movies. According to Halliwell's Film Companion, the process involved "the augmentation of violent action on screen by intense waves of high decibel sound, enough, in some documented cases, to crack ribs." Originally developed as a showcase for the Universal production Earthquake, the process was used in four subsequent films, Rollercoaster, Midway, and in the theatrical version of Battlestar Galactica.

I saw the original Star Wars movie at a theater which featured sensurround audio effects.