 Small-scale attempts had been made to use wide film for commercial theater exhibition around the time of the conversion to sound, of which Fox Grandeur was technologically the closest to the format the DP70 was designed to facilitate the launch of, two decades later.One of the reasons these early systems failed to establish wide film as an industry standard was that the projectors developed for them were incompatible with the existing 4/35 standard.In order to be able to project both, therefore, theaters had to be equipped with two sets of projectors, which involved significant extra cost and in some cases architectural modifications to projection booths.