The ride uses 80-foot IMAX screens and Sony Projectors. There are 24 ride cars, each seating eight people The projection system features new digital technology which makes the resolution four times better than most digital movie theatres. The video is projected onto two dome screens which are made of 416 panels (each 120cm by 60cm) and is approximately 24m tall and 25.5m feet wide. The projector itself uses a custom-made semi-circular fisheye lens to project undistorted images and plays at a rate of 60 frames per second.each car contains 12 speakers and a Dolby 6.1 surround sound, while the domes contain an additional 90 speakers.
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http://en.wikipedia.org/wiki/The_Simpsons_Ride