> > > >

1945 Theatre Catalog, 4th Edition, Page 506 (480)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 506
Page 506

1945 Theatre Catalog, 4th Edition, Page 506

area immediately above.

The locations are spotted so that the grilles are approximately 16 feet apart on a line corresponding to the frontwheel locations of the cars for any one row. To obtain suitable protection against weather, it is mounted in the housing in an inverted position, with the cone face downward; sound energy is reflected upward through the grille from the lower concrete bowl surface.

Generally a small permanent magnetspeaker unit and a matching transformer are utilized. Each unit is mounted in a housing underground, and the entire assembly is contained in a concrete cavity over which is placed a metal grille through which the sound energy emerges to the area immediately above.

In-car type of speakersiTheatre operators who have changed from the central or broadcast type speaker system to incar speakers have reported substantial increases in grosses, due no doubt, to advantages of this type over all others, which include: (1) excellent intelligibility and sound quality, brings the source of sound to each customer, (2) car windows can be kept closed in wet or cool weather without sacrifice to sound reproduction, (3) a greater number of cars can be ac commodated in a given area, due to no ,.

space requirements for speakers between cars, (4) confines sound to theatre area with minimum change of annoyance to surrounding community, and it can be safely used within a quarter of a mile of residential communities, (5) volume

level can be adjusted to each individual customers satisfaction, (6) it can be used in closed cars, extends operating season, permitting theatres to open earlier in the spring and close later in the fall.

The in-car speaker was introduced in 1940. The first in-car speakers consisted of an 8-inch speaker mechanism mounted in a rugged sheet metal case, with a bracket attached for hanging the unit on either the car door or some other convenient place inside the car.

To meet this demand, two types of in-car speakers have been designed especially for drive-in theatres.

In-Car Speaker, Stationary Type, Metal posts installed between each two cars carry two speaker units hanging from hooks and protected from the weather by a metal shelter. Each speaker is fastened to the post with a cable sufficiently long to allow it to be taken ine side the car or fastened to the window edge. When the patron leaves, he disengages the speaker from the car and either hangs it back on the hook or lays it on the speaker shelter.

The speakers are provided with specially designed rubber bumpers to protect them against careless handling. To insure against patrons pulling out terminal wires, the lead wire to the speaker carries a strong steel cable.

These speakers remain on the post for the entire season.

The large majority of drive-in theatres built in the next few years will probably be equipped with in-car speakers of this

RAMP WIRING OF THE SPEAKER SYSTEM can be done in one of two ways. Here in this Radio Corporation of America drawing is shown the way of wiring two general portions of the parking area. From the control switch box, located in the proiection room, it is possible to turn on the speakers of the first four ramps, or of the last six, or both of once. In this sysiem, the operations chief would, at the evening's start, direct cars to but one area.

/ / / / / / \ // / g.






new, all-season type.

In-Car Speaker, Mobile Type a The second in-car type speaker is an individual unit, carrying a length of cable and connecting plug.

These are stored at the theatre entrance and furnished the customer when he drives in. When the car is in place, the attendant connects the cable plug to an outlet jack. On leaving the theatre, the connecting cable is withdrawn, and the patron hands the speaker to an attendant at the exit.

Both types of in-car speakers are small, light, and water-proof, and built to withstand long and rough service without damage. A volume control on the side of the speaker will permit the patron to adjust the sound level for most pleasing reception and a convenient bracket on the back will make it possible to have them on the window ledge or any convenient place inside the car. At some drive-in theatres, a speaker is issued to the occupants of each car as they enter the theatre. After the car has been directed to a parking space by an attendant, he plugged the speaker into the closest connection block installed along the ramps. When the car was ready to leave, the occupant disconnected the speaker cord from the connection block and handed the speaker unit to the attendant at the exit. The disadvantages of this method are (1) the speakers require considerable handling, necessitating several attendants and subjecting the speakers to considerable abuse, (2) the speaker cords are subjected to considerable abuse when patrons disconnect them when leaving the ramp, and (3) the tramc fiow is retarded because of the time consumed in issuing and collecting the speakers.

Speaker Equipment#The most successful method is to have the speakers permanently located at the parking spaces on the ramps, so that when the car drives up on the ramp, the speaker will be adjacent to the car window and can be reached by the patron without leaving the car. In order to use this method, the speaker units must be weather-proof as they are exposed to the elements approximately 24 hours a day. If they are not designed to withstand moisture and high temperature, considerable trouble will be experienced with inferior sound and speaker failure.

Speakers, which meet all of these requirements, are small in size, light in weight, styled very attractively, and 100 percent weather-proof. A volume control located on the front of the speaker permits the patron to adjust the sound level to his satisfaction. A bracket attached to the speaker permits it to be hung on the edge of the car window or on any convenient spot inside the car.

'A combined terminal box and speaker receptacle which has many advantages over the previous types of in-car speaker housings has also been designed. The combined terminal box and speaker receptacle has been designed so that it is very easy for the patron to obtain and replace the speaker in its receptacle without leaving his car.

An important feature of the new RCA in-car speaker unit is that in the event of a speaker unit or speaker cord develops a short-circuit, the operation of other speakers will not be affected. Considerable

1945 Theatre Catalog, 4th Edition, Page 506