Motion Picture Herald (Jan-Mar 1956)

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about Products . . ']Ar news and views nf the market and its sources of supply Westrex Announces New Line of Multi and Single-Channel Sound Systems Westrex Corporation, New York, has announced one of its 1956 lines of sound reproducing equipment for theatres, including complete multi-channel and one-channel systems for both magnetic and optical reproduction. The company states that the systems in the new line are “simpler, smaller, and from 5% to 35% cheaper than comparable 1955 equipment.” Announcements of two other lines of sound equipment will be made later. It is pointed out that the single-channel The Westrex sound system's 27 type, 60 watt power amplifier. systems utilize the new major components of the multi-channel systems and are designed to give the best sound reproduction for theatres not yet ready to convert to stereophonic sound. The single-channel systems can readily be expanded into multichannel systems, it is explained. The Westrex multi-channel systems are composed of the following main units: 1 he Westrex RIO stereophonic penthouse reproducer. It is equipped with two impedance drums and has an adjustable idler roller to match the length of film path for different makes of projectors. A four-track magnetic reproducer head is mounted on a separate plate which may be easily removed and replaced with a head assembly of fewer tracks, if required. The Westrex R6 optical sound reproducer. It features the special timing belts “used in all high quality recording sys tems.” The R6 has a longer optical path, it is stated, and an equilight diffuser, “both of which assure the best reproduction from either variable area or density sound tracks.” All shafts in the R6 are mounted in ball bearings. The 51 B multi-channel magnetic preamplifier cabinet. Wall-mounted, it contains up to four pre-amplifiers, control amplifier, low pass filter, cbange-over and muting relays for multi-channel magnetic reproduction. The amplifiers are plug-in and can be easily removed for servicing. Individual gain controls and equalizers are provided for balancing tbe three main channels. All connections are accessible from the front. The 52A multi-channel control cabinet. Wall-mounted, it contains the control equipment for single and multi-channel as well as non-synchronous and emergency operation. A three-gang volume control is provided for the backstage channels and a single control for the auditorium surround channel. The cabinet also houses the regular-emergency photo-electric cell am The Westrex sound system's 16 type loudspeaker assembly with 80° high-frequency acoustic lens. plifiers and selector switch for non-synchronous, optical and multi-channel magnetic or optical operation. All connections are accessible from the front. The Westrex multi-channel floor cabinets The Westrex multi-channel sound system's BOB four-channel transmission cabinet. Three-channel equipment also for stereophonic sound reproduction and single-channel equipment are available. house up to four 27 type 60 watt power amplifiers with their associated power supplies. These cabinets have self-contained monitoring, non-synchronous, and switching facilities. The Westrex switching includes facilities which enable the projectionist to test each channel independently and in the event of failure In one channel to operate through the other two channels behind the screen or, if desired, through the center single channel. Servicing of this equipment is done either from the front of the cabinets (the mats are quickly removable) or from the 26 MOTION PICTURE HERALD, MARCH 3, 1956