Perspecta

As opposed to magnetic stereophonic soundtracks available at the time, Perspecta's benefits were that it did not require a new sound head for the projector and thus was a cheaper alternative.

[2] Unlike true stereophonic sound, which would be described as discrete tracks running in synchronization in time and phase, Perspecta merely panned a mono mix across various channels.

[1] MGM Studios and Paramount Pictures were major supporters and developers of Perspecta.

[citation needed] Universal-International, Warner Bros., Columbia Pictures, United Artists, and Toho were among some of the other major studios to utilize Perspecta regularly.

[3] Some other films, such as Around the World in 80 Days (1956, United Artists), also used Perspecta to convert their non-encoded mono optical soundtracks to three channel surround.