Bose Panaray MA12 Fondazione tecnica e discussione - Pagina 14

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Figure 5. A plane wave diverges in only one dimension: out, but not up

and down, or left and right. As a result, the intensity does not drop off

at all.

Plane waves, however, are difficult and impractical to create outside of the laboratory. To

create plane waves in the open air requires an unusually large surface area – one at least one

meter by one meter square – to have any chance of creating plane or plane-like waves over a

reasonably wide range of frequencies. And by unique mechanical inventions this source

would have to be pistonic, meaning that the whole surface moved at the same magnitude and

phase at all times. To our knowledge, no such source has been attempted much less achieved,

even in prototype form.

Yet even if such a source could be realized – and if it were only driven at frequencies

where the wavelength is much smaller than its dimensions – there would be no sound outside

the source area, as shown in Figure 6, because the plane, or plane-like waves are only

radiated out but not to the sides, or up or down. A one-meter by one-meter source, therefore,

would have extremely limited, if any, application because it would only cover listeners

located within a one-meter by one-meter projection. To cover a typical audience, a plane

wave source would have to be much larger. It would need to be the same width and height as

the audience. Even if mechanically possible, which is extremely unlikely, it would obviously

also be completely impractical because of its size.

Bose

MA12™ Modular Array: Technical Foundation & Discussion

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