Boxoffice (Oct-Dec 1963)

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ACHIEVING HIGH-QUALITY SOUND REPRODUCTION WHAT TO LOOK FOR IF SOUND REPRODUCTION IS VERY INFERIOR w E HAVE FOUND in the field, in many situations, very inferior sound reproduction due to a mismatched speaker setup, and wrong size and type of speaker for that particular auditorium. In some cases the low frequencies were overemphasized and the sound reproduction was “boomy,” resulting in very poor reproduction of female voice and brilliant music. The low and high-frequency speakers should be set about 40 cps and the high frequency response around 8,000. Please keep in mind, however, the setting of the frequency response will depend upon the acoustical treatment of the auditorium, balcony and other factors, such as a dome, etc. In some cases we have set the response at 50 to 5,000 cps. With a reel of good music and male and female dialog, you can test for the most pleasing reproduction in any theatre. A two-way speaker system is a “must” in any theatre, in our opinion. While the principle of operation of loudspeaker equipment is really simple, it is a very difficult and complicated job to produce loudspeaker equipment which will efficiently convert a wide range of electrical frequencies into sound energy, particularly where considerable amounts of energy are needed to make sound loud enough to be heard comfortably over a considerable area. Low-frequency sounds from either horns or baffles are relatively non-directional, that is, they spread out fairly well all over the area in front of the horn or baffle. This is, unfortunately, not true of the higher frequencies; they tend to be confined along the axis of the speaker unit in the baffle, or along the longitudinal axis of the horn. Anyone can verify this by noting how much more crisp and clear the quality is, directly in front of a radio speaker, than it is some distance from the side. In theatre work, where the aim is to provide good sound quality at every seat, this problem of high-frequency distribution is very important. Two-way loudspeaker systems solve this distribution problem, in addition to eliminating the need for compromising the efficiency of speaker units to enable them to reproduce both high and low frequencies. A COMPLETE ASSEMBLY A high-frequency horn (a multicellular horn), a high-frequency speaker unit and a horn throat constitute a complete assembly that will reproduce faithfully if properly matched to the output of the system, all the high frequencies of the sound originally photographed on the sound track on the film. Since the higherfrequency sounds tend to be absorbed by soft materials, the higher-quality highfrequency cellular horns are usually made of metal and have adjustable legs in front, when mounted on top of the low-frequency speaker enclosure, for adjusting high enough to direct the speaker properly for best results. Low-frequency speakers are mounted in proper housing, specially constructed inside, with wings for high-quality lowfrequency response. With some systems a Wesley Trout in one package LEASE FINANCE PLAN TECHNICAL PLANNING TOP GRADE EQUIPMENT THAT INCLUDES NORELCO PROJECTORS Soundheads — Lamps — Projectors — Amplification Speakers — Seating — Screens Screen Towers — Carpets — In-ACar Speakers — In-A-Car Heaters. Now you can finance new theatre equipment — remodel or replace outmoded equipment in your present one all with the same company. No need to purchase part of the equipment from one company, have it installed by another, and serviced by a third. Ballantyne technicians handle your theatre work from start to finish. And saves you money. a //a ntyne Instruments and Electronics, Inc. 1712 JACKSON ST. OMAHA, NEBRASKA 68102 A DIVISION OF ABC VENDING CORPORATION ■■■■■■■ TO-GET-THE BEST RESULTS USE THE BEST FILM CEMENT ETHYLOID Available at All Theatre Supply Dealers Fisher Manufacturing Co. MoMU^Gctusunif. CUetniiti. 1185 Mt. Read Blvd. Rochester, New York, U.S.A. 10 The MODERN THEATRE SECTION