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1945 Theatre Catalog, 4th Edition, Page 347 (323)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 347
Page 347

1945 Theatre Catalog, 4th Edition, Page 347

quency speaker should be as close to the screen as possible, and because of the necessary placing of the one in relation to the other, the whole speaker assembly must be so placed as to accomplish that necessary proximity of the high-frequency speaker to the screen. It will be obvious from this that the proper location of the speakers at the time of installation is of utmogt importance.

Sound Quality

Sound quality at the listeners ear will be affected by two more factors; echo and reverberation time (multiple echoes) in the auditorium. Sound delivered to an auditorium is gradually absorbed by the walls and by whatever objects may be present. If that absorption occurs too rapidly, the sound will seem lifeless, while if it occurs too slowly, one sound will not be absorbed before the succeeding sound is delivered and one overlaps the other, blurring both. A similar condition will result if one sound reaches the listener directly from the speakers and a fraction of a second later the :ame sound reaches him as an echo from seine other point in the auditorium.

That condition, if serious, can be corrected only by looating and properly treating the renecting surface. However, if the eEect of reverberation is not excessive, it may be possible to compensate for it by adjustment in the amplifier, since it usually is more troublesome at some one frequency, or band of frequencies, than at others. Such an adjustment should be made by the engineer who supervises the installation.

The logical conclusion which derives from all these facts isemaximum sound quality can be attained only by closely coordinating all the factors involved. RiCA sound systems are designed and manufactured with this end clearly in mind, and with a view to providing a product which may be expected to give natural, lifelike reproduction, for the longest time, and with the lowest possible upkeep expense.


(Wesrrex Corporation)

Westrex Muster

New and post-war, the Westrex Master is the finest sound system ever offered to the worlds motion-picture industry by the Westrex Corporation. On every countasound quality, simplicity, durability, and styl%it is far ahead of prewar theatre systems.

The Westrex Master makes good use of new ideas and component parts developcd by intensive wartime research in Western Electric's greatly expanded laboratories and manufacturing plants.

Improved methods of controlling the movement of film, better amplification of the energy picked up by the photoelectric cell, and improved conversion of the electrical energy into acoustic energy# these are some of the features which make it outstanding.

These mechanical and electrical improvements made the equipment more durable and dependable. They deliver to the ears of theatre patrons a quality and quantity of sound such as they have never heard before. Here, briefiy are



some of the new features of the Master.

A hydro nutter suppressor which reduced mechanical flutter to less than one half of the industryis standard.

A built-in pre-amplifier which has been reduced to a fraction of the former size. For these two features alone, the alert exhibitor is going to want the new Westrex Masterebut in addition he will receive many other advantages.

An electro-tension governor which provides electro-magnetic control of film speed to compensate for ductuations in motor and sprockets.

An equilight diffuser which helps to reproduce every sound track, whether variable density or variable area, with maximum efficiency.

A film alignment control which makes certain that the track and light beam

1945 Theatre Catalog, 4th Edition, Page 347