Motion picture sound engineering (1938)

Page scan 000131 from Motion picture sound engineering

Record Details:

Title:
Motion picture sound engineering
Date:
1938
Publisher:
New York : D. Van Nostrand Company, inc.
Volume:
Motion picture sound engineering
Leaf #:
000131
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Date Added:
May 08, 2025
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HEADPHONES AND LOUD-SPEAKERS 101 were made with a Y throat and two units. As a result of these experiments, it is now recognized by all concerned that any increase in phase distortion which may be introduced by the Y throat is negligible. The diaphragms are made of duraluminum 0.002 inch thick and have an area of six square inches. The diaphragm is mounted on the Figure 63 — The Y Throat. back of the assembly and by the use of an annular opening, the sound that is admitted to the throat within the unit has a minimum phase distortion. (Figure 64.) This is still further reduced by having this throat exponential beginning at the annular opening, and avoids a sharp discontinuity that may exist with a tubular throat. Two units are connected by means of a Y throat to the multi-channel horn which tends to reduce the distortion of high throat pressure. The field excitation requires twenty-five watts per unit. To obtain high efficiency energy transfer between the diaphragm and air column in an exponential horn loud-speaker, the acoustic impedance of the air must be matched with the mechanical impedance of the diaphragm. Such an impedance match is usually secured by the use of an acoustic transformer which provides a properly constricted