The super 8mm system was one of the few film formats where the requirements of sound were designed in from the start. The sound track was added on the edge of the film opposite to the perforations (see the illustration at head of the article). Standard 8mm had the stripe between the perforations and the edge of the film which made good contact with a magnetic head problematic. A balance stripe was sometimes added on the opposite edge to facilitate spooling of the film. Projectors that could record and play sound appeared before sound cameras. The sound was recorded 18 frames in advance of the picture (as opposed to 56 frames for standard 8mm). This short distance of just 3 inches facilitated the relatively compact size of the later sound cartridges. Some projectors used the balance stripe to provide a second channel and hence
stereo sound.
Super 8mm was also specified with an optical sound track. This occupied the same location as the magnetic track. Picture to sound separation in this format was just 16 frames. Projectors and cameras obviously could not record sound in this system, but optical sound package movies became briefly popular, particularly in Europe (mainly because they were cheaper to produce - though the projectors cost more). Although the optical sound should have been inferior in quality to magnetic sound (running at 3.6 inches per second for 24 frames per second), in practice it was often much better, largely because packaged movie magnetic sound was often poorly recorded
