Bose Panaray MA12 Technische fundering en discussie - Pagina 13

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THREE KINDS OF SOURCES

explained, the hang-and-tilt approach evolved because of a fundamental property of the

speakers used. Namely, the speakers have sound waves that radiate in all directions, in and

out, up and down, left and right. And that means that the intensity of sound leaving the

sources falls off by 6 dB per doubling of distance. We call these spherical-wave sources. To

provide consistent sound levels over a widely distributed audience, listeners must be nearly

equidistant to the speaker, and hence the need to raise the speaker into the air over the heads

of the listeners.

The obvious question is whether this fundamental 6 dB per doubling of distance property is

true for all sources. The answer is no. There are other kinds of sources that produce different

kinds of sound waves with very different behavior.

Plane waves

example, we generate plane waves to measure the performance of compression drivers

in the lab. These waves diverge in only one dimension: out, but not up and down or left and

right. As a result, the intensity of a plane wave does not fall off at all with distance

in Figure 5. In other words, the distance can be doubled and the sound level is the same. Such

a source, therefore, could produce the same sound pressure level in all seats – what would be

considered ideal coverage.

This is an ideal description. In reality, any sound wave, whether spherical or planar, is affected by

environmental effects, such as humidity, temperature and wind.

Bose

MA12™ Modular Array: Technical Foundation & Discussion

Page 13 of 36

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