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1953-54 Theatre Catalog, 11th Edition, Page 275 (239)

1953-54 Theatre Catalog, 11th Edition
1953-54 Theatre Catalog
1953-54 Theatre Catalog, 11th Edition, Page 275
Page 275

1953-54 Theatre Catalog, 11th Edition, Page 275

that great care must be exercised in stereophonic presentation if the effects created by the studios are to be maintained. There have already been indications in some of the initial stereophonic shows that local operating personnel have tried to improve upon the studio techniques. Very unsatisfactory results have been obtained where maladjustment of equipment. and unusual effects have been created to apparently demonstrate the volume range and versatility of the equipment. It is recommended that the product be reproduced as it is produced.

At the present time most product being released is on triple track magnetic recording reproduced in a separate magnetic reproducer which is operated in synchronism with a motion picture machine projecting the picture iilm. In some instances a fourth optical track is a part of the picture film and is reproduced through the auditorium or nsurround" speakers. CinemaScope will be released with four magnetic tracks recorded on the picture film. It will not be necessary under this condition to operate a separate magnetic reproducer, as such, but a magnetic attachment would be installed on the present motion picture projector in order to produce the four magnetic tracks in synchronism with the projected picture. In either case whether it be separate magnetic film reproduced through a separate reproducer or whether it be a composite film carrying both picture and magnetic recording on the same film, the subsequent processes are identical.

The sound is picked up by magnetic reproducers and amplified through high quality amplifiers and terminates in efficient high quality loudspeakers. The stage loudspeakers are located one at the left, one at the center and one at the right-hand side of the screen. Location of the speakers with relation to the


screen are dependent upon the size of the screen and its relationship to the proscenium and the auditorium. The fourth channel whether it be optical or magnetic likewise is reproduced through an amplifier system and terminates in the Usurround" speakers located in the auditorium.

Quality Equipment

The main point to consider in contemplating installation of stereophonic equipment is, high quality reproduction is possible only with high quality equipment. The main stereophonic channels must be identical in all respects. The magnetic pick-up. preamplifiers. main amplifiers and loudspeaker systems for all three channels must be identical* not merely similar. Unsatisfactory results will be obtained if attempts are made to provide a multi-channel system with dissimilar equipment. Furthermore, to take full advantage of dynamic range now permitted by new recording techniques, adequate power in the amplifier systems should be provided to drive high quality loudspeakers at full efficiency.

Most industry dealers are planning the needs for their theatres in order to avoid the mistakes made during the introduction of sound. As a result of hysteria and a wild scramble for sound equipment in 1929 and 1930, many theatres purchased inferior equipment which necessitated replacement and duplication of costs. It is difficult at times like this to impress the exhibitors with the folly of such reasoning, since it is only natural that each exhibitor wishes to capitalize as quickly as possible on these new developments. Sound business reasoning, however, would indicate that it would be better to wait a little longer for a high quality job than to rush through an inferior one. This is an entirely new art being presented to the public. Properly presented under satisfactory conditions

to produce high quality stereo phonic sound is shown here in a behind-lhe-screen view- oi the Muslbuum in Philadelphia in a demonstration of the Fox CinemaScope wide screen system. Note the framework used to support the screen.


it will be successful. If improperly presented it will fail.


It must be borne in mind that after having selected and purchased high quality equipment and after having it installed by competent technicians, only the first phase of stereophonic presentation has been accomplished. High maintenance standards will be necessary if the stereophonic system is to be used to its full advantage. Heretofore slight degradations of quality, variations in output level, as well as changes in frequency response have not been readily noticed by the audience. While theSe sub-standard conditions were not desirable they were in the past tolerated. In stereophonic operation these important matters cannot be ignored. It is of prime importance that the quality, frequency response and volume levels between channels be held to very close limits of deviation. The balance between channels in full stereophonic reproduction is controlled by the recording engineers at the studios. Only faithful reproduction on well maintained theatre systems will enable the audience to capture the effects which the directors have created. More care and attention will be required on the part of the projectionists and the service inspectors to maintain these high standards.

A CENTURY HEAD has been adapted in this unit to handle three magnetic sound tracks.
1953-54 Theatre Catalog, 11th Edition, Page 275