Bose Panaray MA12 Fondazione tecnica e discussione - Pagina 32

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Figure 19. The Massaa area is a long corridor with a reverberation time

of about seven seconds. The existing system, along with a wide variety

of alternatives explored with Modeler and Auditioner, did nothing to

improve intelligibility. A line array solution was tried late in the

research phase of the project and proved stunningly effective.

The existing system used speakers in the ceiling with 4" (10.2 cm) drivers, laid out in rows

of 4, spaced every 5 meters. According to the occupants, the speech was completely

unintelligible. Many alternative design approaches were then tried by a research team at

Bose, using Modeler and Auditioner as their tools. Large-format horns in the ceiling,

carefully aimed at the floor were tried in an attempt to decrease the amount of reverberation;

Bose 402s were tried on the sidewalls; Model 32s at a low height so as to get them close to

the people was tried; FreeSpace 3 cubes in the same locations were tried. None of these

alternatives made a significant improvement on the intelligibility.

Then line arrays using twelve (12) 4.5" drivers mounted in three enclosures were tried. The

results stunned the research group. The fact that these line arrays do not emit sound up and

down caused the reverberant field to go down dramatically and the speech intelligibility to

increase significantly. A system has now been installed throughout the mosque. The customer

has told Bose that it is the Massaa where the largest improvement has been achieved.

Bose

MA12™ Modular Array: Technical Foundation & Discussion

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