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1945 Theatre Catalog, 4th Edition, Page 339 (315)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 339
Page 339


1945 Theatre Catalog, 4th Edition, Page 339

utilization of considerably more conductor material in the air gap, greatly increasing efficiencies and decreasing operating temperatures. The diameter of the edgewise-wound, copper-ribbon voice coil has been enlarged permitting utilization of. higher power with less distortion.

' Another feature of the low frequency speaker is the highly eflicient dome-inserted, moisture resistant, seamless molded cone with effective driving area of 123 square inches. Cone and voice coil assembly are permanently aligned in a 15-inch die-cast frame and clamping ring. Impedance of the unit is approximately 20 ohms under normal operating conditions.

The Models

Model A1, Voice of the Theatre, provides deluxe presentation in large theatres. The six low frequency speakers provide an extended base reproduction and permit 100 per cent utilization of the complete frequency range as recorded on the sound track. Two high frequency speakers feed into a multi-cellular high frequency horn, which in turn distributes high quality sound evenly throughout the auditorium. Selected sizes of high frequency horns are used with this system, depending upon the architectural design and acoustical characteristics of the theatre.

Model Al-X, Voice of the Theatre, is exactly the same as Model A1, except that special high frequency horns and adaptors are provided so that four high frequency speakers can be used with properly selected multicellular horn.

Model A2, Voice of the Theatre, has been designed to provide deluxe presentations in theatres whose seating capacity does not exceed 2,800 seats. Four low frequency speakers provide an extended bass reproduction and permit 100 per cent utilization of the complete frequency range as recorded on the sound track. Two high frequency speakers feed into a selected type of multi-cellular horn providing even distribution of high quality sound throughout the auditorium. High frequency multi-cellular horn selected will depend upon architectural design and acoustical characteristics of your theatre.

Model A2-X, Voice of the Theatre, is exactly the same as Model A2, except that a special high frequency horn and adaptors are provided so that four high frequency speakers can be used with the properly selected multi-cellular horn.

Model A4, Voice of the Theatre, provides deluxe presentations in theatres whose seating capacity does not exceed 1,200 seats. A medium size speaker for medium sized houses, the twa low frequency speakers of the Model A4 provide extended, true bass reproductions and permit 100 per cent utilization of the complete frequency range as recorded on the sound track. The high frequency speaker also delivers the same high quality sound as other models. And to provide perfect distribution of high quality sound throughout the auditorium, selection of the high frequency multi-cellular horn will depend on individual architectural and acoustical characteristics of your theatre.

Model A5, Voice of the Theatre, permits the exhibitor, whose theatre seating

1945-THEATRE

CATALOG

capacity does not exceed 750 seats, to keep pace with his bigger competitors. For although Model A5 is a smaller size speaker, it provides comparable high quality performance of the larger models. Model A5 has one low frequency speaker of the same type used in the larger models. The same high frequency speaker and high frequency multi-cellular horn as used in the large models assures 100 per cent distribution of high quality sound.

Model A6, Voice of the Theatre, is presented in illustration of the perfections that have been achieved in advanced methods of sound reproduction. By combining both high and low frequency speakers in a small compact speaker with a special network, all the features of the future are enjoyed in quality presentation. Model A6 is a special Voice of the Theatre speaker and is recommended for unusually small theatres and review rooms.

CENTURY PROJECTOR CORPORATION

During the latter phases of the war effort the engineering development of new sound reproducing equipment was again initiated.

Two new sound heads have been de vised, together with associated equipment.

New principles of film stabilization were developed resulting in greatly improved flutter control, eliminating many of the undesirable, uncontrollable mechanical weaknesses of previous equipment. The new principle of operation employs loops of film under tension, between the sound drum and sound sprocket, controlled by a constant tension device with oil lamping.

Greatly improved sound reproduction has been demonstrated from the new equipment.

As a result of a planned program Century has, therefore, taken the second step toward a professional equipment designed for the reproduction of talking motion pictures with consideration for sturdiness of construction, freedom from mechanical failures, improved sound and picture quality, together with simplified designs for easier maintenance.

It is our prediction that the next step . of this program may again provide the motion-picture industry with advances in designs not heretofore possible. New metals, new optics, new ideas are constantly being investigated in view of producing equipment worthy of assuming the responsibility of projecting the

ALTEC-LANSING'S MODEL A-4 VOICE OF THE THEATRE
1945 Theatre Catalog, 4th Edition, Page 339