> > > >

1948-49 Theatre Catalog, 7th Edition, Page 417 (404)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 417
Page 417

1948-49 Theatre Catalog, 7th Edition, Page 417

SOUNDMASTER NIX-24 power or booster amplifier.

reverse angle tilt as required for use in drive-ins and eliminates the need for shoring up as in a conventional base.

The Soundmaster line of projector bases is designed and constructed to meet all of the requirements of presentday modern projectionebuilt like a battleshipea steel column electrically welded to a heavy steel base plate, and weighing over 200 pounds ea th, they provide rock-ribbed foundations for sound and projection equipment. Also, the heavy steel base plate and welded construction assures safe delivery at destination without breakage in either domestic or export shipments.

Over 50% of the weight of the Soundmaster base is in the steel base plate# right on the floor, providing a rigid formation that eliminates any possibility of vibration.

Leveling of the Soundmaster base is accomplished through four threaded

International Projector Corporation, and, for that matter, the

screws located in each corner of the steel base plate, making possible proper alignment of the projected field on the screen and at the same time permitting solid contact with the floor, regardless of how uneven it may be. A convenient hand wheel adjustment is provided to meet all conditions of vertical angle or tilt. Provision is also made for lateral alignment of the lamphouse and projector.

Royal Soundmaster and other late model soundheads attach directly to all models of the Soundmaster projector base with no other adaptor or soundhead support arm being required. Proper support arms :ire available for many other model soundheads.

The lamp carriage will accommodate Lightmaster and all other standard type projection arc-lamps. Soundmaster projector bases are built for standard booth requirements, but are available also for special heights for non-standard booths.

Two-Way Horn Systems

Ballantyne has added one entirely new (fGolden Voice of the Silver Screenil twoway horn system to its line and replaced all baflies in its other two-way horn systems with a new, acoustically reinforced low frequency baffle.

According to I. M. Brown, chief engineer, the new Model 14 two-way horn system, designed for the smaller theatre, is notable for its simplicity in design and smooth high and low frequency characteristics.

Royal Soundmaster Models Nos. 14, 20 and 30 all have large, completely metalcased, acoustically treated, high frequency multi-cellular horns with a high frequency driver unit using an Alnico-5 permanent magnet. Each of these models also has thLfl Alnico-5 permanent magnet 15-inch low-frequency speaker units which the company claims give a high efficiency in the conversion of low frequency response. These improved speaker units with their extra driving force require a special acoustically reinforced low-frequency horn baffle. Ballantyne engineers have met this problem and now all models of Two-Way Horn Systems with these special bames are available at no extra cost. This balhe is notable for its simplicity in design in that it makes no use of compensating chambers or other devices which tend to


Now, for the benefit of the boys who use slide rules and

THE NEW Soundmaster MX-ZO preamplifier driver.

distort the sound. The low frequency speaker is mounted so that the speaker itself is acoustically loaded. The high frequency driver unit is connected to an all metal multiecellular horn to provide the necessary high frequency coverage.

To assure outstanding performance of ffThe Golden Voice of the Silver Screeni, Two-Way Horn Systems, a critically turned dividing network is provided with each system, with a crossover point of 500 cycles. Provision is made for five steps of high frequency attenuation to adapt the horn system to the acoustical characteristics of the auditorium. Standard input impedance of this dividing network is 500 ohms.

Ol'her Equipment

The Ballantyne Company is continuing in their line their regular PD-50, 55, and 56 series theatre amplifiers, as well as their Arcmaster one Kilowatt lamp.

entire equipment manufacturing fraternity, may take justifiable pride in a letter at hand from George L. Miller, projectionist at an eastern theatre, who comments on the fact that a certain E-7 projector head uwas put in operation on Feb. 10, 1939 . . . ran 65 hours or more per week for nine years and five months without any new parts except one feed sprocket

and at no time required attention or adjustment of any kind."

That, in any manls league, is service, and it must start way back at the factory where the designing and machining starts.

like figures, check this: (1) nine years and five months equals 490 weeks; (2) as this head operated only half the time, 490 weeks equals 15,925 running hours; (3) at 60 minutes to the hour, 15,925 running hours equals 955,500 running minutes; (4) as the average film speed is 92 feet per minute, 955,500 running minutes equals 87,900,000 feet of film; (5) as there are 16 frames (or individual pictures) per foot of film, 87,900,000 feet of film equals 1,406,496,000 individual pictures for which this projector head stopped, flashed on the screen, and went on, (6) as there are three individual actions which take place . . . Oh! the H--l with it!

1948-49 Theatre Catalog, 7th Edition, Page 417