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1948-49 Theatre Catalog, 7th Edition, Page 254 (243)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 254
Page 254

1948-49 Theatre Catalog, 7th Edition, Page 254

Survey of All Current ln-car Speakers

A Resume of Statistical Data, Styling. Construction, Weatherprooiing and Special Features Claimed by Each

Outdoor electronics achieved increasing popularity in 1948 with new drive-in theatre in-car speakers appearing in a wealth of types and models. The following survey lists the offerings of the slightly more than dozen companiesvwhich The Editors believe. represent the principal sources of supply. Because an in-car speaker is a small and relatively simple piece of equipment, different areas occasionally come up with a new manufacturer. But those here analyzed have the virtue of national distribution,#and many are the product of old established industry names. Data presented includes (depending on the amount of information released to THEATRE CATALOG by each company): speaker construction and design, junction-box construction and design; weatherproohng, and special features claimed for the. model. For more detailed information on any speakerand especially in reference to its adaptation to a specific locationethe reader is referred to the company which manufactures it.


The National Auto Voice in-car speaker unit manufactured by the Drive-Iii Theatre Equipment Company, Inc., utilizes 9. 51,4" speaker employing a 1.45

AUTOVOICE AC8 speaker with concession signal.


ounce slug permanent magnet. Integral voice coil is wound on aluminum foil and the air gap provided is 1.5 thousandths larger than PMA specifications require. Design of the unit is unique in that the speaker is mounted from yoke position rather than from front, thus providing protection from direct rain. Volume is effectively and easily controlled by a knurled wheel located in a recess on the side of the speaker housing.

In severe testing, the Auto Voice speaker is claimed to have withstood 200 hours in corrosive salt spray without deterioration or damage to the securing glues. And after a drying period and another gruelling 100 hours in salt spray, reproduction remained unimpaired.

The junction box is finished in krinkled maroon. For additional protection the speaker cabinets are first rustproofed, then primed, and finally finished in automotive nonechipping enamel. In corrosion-testing, these cabinets are claimed to have withstood a 200-hour salt spray test.

The Auto Voice speaker is designed for both easy installation and handling. The special pipe flange at the bottom of the junction box will receive pipe up to 2.5" O.D., without threading; and the handle on top of the speaker unit enables each customer to remove and to replace the speaker cabinet with ease.

The most unique feature of this speaker is its talk-back system. A reversing button on the side of the cabinet permits any customer in the speaker equipped area to call his or her order directly into the concession boothethis makes for both efficiency and increased comfort since the customer does not have to miss any of the show in order to restoke; and the candy and popcorn merchants know exactly where specific demands are arising. The patented talkback system is said to be a very practical and convenient method for increasing concession sales.

Wiring for the talk-back system is not associated with the sound wires. It consists essentially of a separate shielded cable extending to each channel, paralleling the speakers in the channel and terminating at each channelis console. (Note: A channel in this system means an arbitrarily designated subdivision of the entire speaker area see diagram).

When the reversing button is pressed, the reversing switch momentarily breaks the normal sound reproduction on that speaker for as long as the button makes contact. Operation of this unique signal system in no way interferes with the sound reception on any other speaker.

The system is practically foolproof. l'ranksters are foiled by the use of number combinations and alphabetical] ar

rangements which make it almost impossible to give false location data to the concession stand without it becoming instantly obvious. In fact, one operator has the car-hops themselves place orders from the field. If multiple orders come in on the same channel, the customers can all hear each other and the operator; and can take turns calling in their orders. To party-line telephone users, this will pose no problems.

Other Miscellaneous Equipment

Other associated Auto Voice equipment includes ramp control panels, ramp light transceiver for traffic control, and a separate in-car heating unit. This last item, the heater, is entirely separate from the speaker for reasons of safety. It is plugged into the post by a connector, that easily disconnects or pulls out if an absent-minded patron forgets to remove the heater from his car before he drives olf. Otherwise, if the cable were severed, 110 volts on the loose could severely shock or even electrocute the guilty party or even an innocent bystander. Regardless of the, choice of victim, resultant lawsuits could be disastrously costly. The manufacturer recommends that the heater be plugged in and removed by an attendant, thus eliminating customer-handling entirely.

The heaters are manufactured in 100 and 250 watt sizes. For both sizes, several circuits or feeders are required in order to carry the load safely. Usually, the load can be controlled by allowing only a limited number of heaters to be in use at the same time.

1948 AUTO VOICE CENSUS: Fifty driveein theatres (location not given) equipped with Auto Voice in-car speakers.

AUTO VOICE AC 1 lower-priced speaker.
1948-49 Theatre Catalog, 7th Edition, Page 254