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Consumer Electronics by S. P. Bali

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ACOUSTIC DOUBLETS

The cone of a loudspeaker moves as a unit. When the cone moves forward, the air in front is compressed and the air in the back of the cone is rarefied. The sound released from the rear of the cone is of opposite phase to that released from the front of the cone. If the sound from the rear is allowed to flow so that it meets the sound from the front, cancellation takes place and the response of the speaker drops off sharply.

Such an arrangement, Fig. 5.1, is called an acoustic doublet in which the two sides of the diaphragm are represented by a negative and a positive pole radiating respectively a negative and a positive wave [see Fig. 5. 1 (b)]. If these doublet sources are close together, it is obvious that the negative wave ...

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