Bose Panaray MA12 Технические основы и обсуждение - Страница 15

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Figure 6. What makes plane waves impractical is the fact that there is

no sound outside the physical size of the source.

Cylindrical waves

this point, two kinds of waves have been described: spherical waves that radiate in three

dimensions and whose intensity drops off by 6 dB per doubling of distance, and plane waves

that radiate in one dimension and fall off by 0 dB per doubling of distance. A natural question

is, therefore: "Is there a third kind of wave that radiates in two dimensions and falls of

somewhere between 0 and 6 dB per doubling of distance?" The answer is yes. And these are

called cylindrical waves. To understand their behavior, it is helpful to return to the one-meter

by one-meter source that created plane waves. Looking down on the plane-wave source, it is

clear that the sound is confined to the width of the source (Figure 7, top right). Looking from

the side of the source, the sound is similarly confined to the height of the source (Figure 7,

bottom right).

Bose

MA12™ Modular Array: Technical Foundation & Discussion

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