Film

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Now, 35mm film accommodates the 6-track digital sound, but previously almost all films released in 70mm from 1971-1992 which were originally photographed in 35mm and then blown up to the 70mm format specifically for playback with 6-track sound. The motion picture exhibition format from 1955-1971, 70mm, contained 6-track magnetic sound, using camera equipment manufactured by Todd-AO and Panavision. The camera negative was 65mm wide, with the additional 5mm outside the sprocket holes used for the magnetic stripes on release prints. Almost all modern 70mm prints in the U.S. have no magnetic track, but instead use DTS in conjunction with a wide timecode track outside of the perforations.

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