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Wireless Loue Speakers a Practical Manual describing the Principles of Operation, Performance, and Design

    Naturevolume 120page43 (1927) | Download Citation



    THIS book describes in a simple way the main principles used in the design of various modern types of loud-speaker. Both the amateur and the expert will find in it much that is instructive. The musician who judges from the average loud-speaker reproduction of to-day is forced to conclude that at the best it is only fair. The performance of even the best loud - speakers is far from ideal. The musical ear soon detects resonances in the reproduction, and sometimes it soon ceases to give pleasure. It is also necessary that there should be no falling off in the reproduction of notes in the scale having frequencies between 40 and 400 cycles and also in the scale from 2000 to 4000 cycles. In the former case the bass, and in the latter the upper harmonics, are almost lost. In practice the ear finds a great difficulty in judging which of several imperfect instruments is the best. It seems to be a matter of taste. It has to be remembered that the radiation of sound from a horn loudspeaker is in the form of a divergent beam, the best quality being obtained when the aperture of the horn points directly to the listener. With a cone diaphragm the radiant beam is wider and extends on both sides of the diaphragm. Owing to the focussing effect the reproduction is best with the concave face to the front. In certain cases, however, this is somewhat modified by reflection from the walls of the room.

    Wireless Loue Speakers a Practical Manual describing the Principles of Operation, Performance, and Design.

    By Dr. N. W. McLachlan. Pp. viii + 139. (London: Iliffe and Sons, Ltd., 1927.) 2s. 6d. net.

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