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Bose

MA12 Modular Array:

Technical Foundation & Discussion

Morten Jørgensen and Kenneth Jacob, Bose

Professional Systems Division

Summary

Bose MA12™ modular array takes advantage of the properties of cylindrical

waves to meet customer requirements that until now could only be met with

loudspeakers flown and aimed in more elaborate and expensive designs. With only

two dimensions of dispersion rather than the three of the more common spherical

waves, the sound from cylindrical waves diminishes much more gradually with

distance from the source. As a consequence, listeners experience relatively little

change in sound level from far away from the MA12 to literally right next to it. The

same gradual change in sound with distance makes the MA12 less susceptible to

feedback from microphones in close proximity. The radiation pattern of the MA12 is

wedge-shaped: wide from side-to-side but sharply confined to the top and bottom of

the array. The vertical radiation virtually shuts off above and below the speaker. As a

result, much less reverberation is generated because almost no sound is radiated

upwards to distant surfaces in the upper part of the room. The result is noticeably

better clarity and intelligibility. The ultra-thin shape of the MA12 means it is easy to

hide; it may be the most unobtrusive speaker yet developed given its exceptionally

high output and full, balanced frequency response. The fact that the MA12 is placed

at ear level (so that listeners are confined within its wedge-shaped radiation pattern)

means that it can usually be installed for a fraction of the cost of more elaborate

'flown' loudspeakers and loudspeaker clusters. Finally, it can be matched to a low

frequency enclosure (Bose Panaray MB4 ) when extended bass performance is

needed. Taken together, these features and advantages result in a product that

represents an important new tool for satisfying the most basic and important customer

requirements in a wide range of common applications.

Bose

MA12™ Modular Array: Technical Foundation & Discussion

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