Bose Panaray MA12 Technical Foundation & Discussion

Modular array

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Bose

P a n a r a y MA12 Modular Array:

Technical Foundation & Discussion

Morten Jørgensen

Manager, Marketing and Product Planning

Kenneth Jacob

Chief Engineer

Professional Systems Division

Bose Corporation, Framingham, MA, USA

April 2002

Summary of Contents for Bose Panaray MA12

Page 1 ® Bose P a n a r a y MA12 Modular Array: Technical Foundation & Discussion Morten Jørgensen Manager, Marketing and Product Planning Kenneth Jacob Chief Engineer Professional Systems Division Bose Corporation, Framingham, MA, USA April 2002...
Page 3 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...
Page 4 The standard design approach for meeting these requirements is unofficially called the ‘hang-and-tilt’ approach. In this approach, speakers with controlled radiation patterns are ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 4 of 36...
Page 5 The purpose of this paper is to show that the Bose MA12™ modular array represents a significant and important extension to the hang-and-tilt approach. To do this, our strategy relies on an explanation of the speaker’s unique sound radiation pattern, and how that...
Page 7 – in this case to only 6 dB – which corresponds to a near-to-far distance ratio of 1:2. ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 7 of 36...
Page 8 Moreover, because the speakers are located up and out of the way, they rarely interfere with sightlines. Over the years, Bose and others have developed a number of technological solutions ®...
Page 9 Figure 3b, people outside the main beam will hear a serious degradation in tonal balance, level and clarity. ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 9 of 36...
Page 10 These dropouts caused by interference have a significant impact on clarity, intelligibility and tonal balance. ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 10 of 36...
Page 11 The visual activity is usually to the front of the listener, but the sound comes from above where the speakers are located. This lack of eye-ear correspondence is ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 11 of 36...
Page 13 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 April 2002, © Bose Corporation, All Rights Reserved Page 13 of 36...
Page 14 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 April 2002, © Bose Corporation, All Rights Reserved Page 14 of 36...
Page 16 (Note that the same physics explain why a 2" (5 cm) driver has a much wider radiation angle than a 12" (31 cm) driver, assuming both are operating at the same frequency). ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 16 of 36...
Page 17 The sound radiates in and out and to the sides, but not up and down. ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 17 of 36...
Page 20 Major improvements in transducer technology (including many introduced by Bose) mean that it is no longer true that the small transducers needed to fit into a slim line- shaped source lack the correct balance of frequencies or necessary output capacity. A full, balanced frequency response and very high output is now possible from speakers no larger that a tea cup.
Page 21 In many situations, this represents a major improvement in the physical impact imposed by a sound system on its environment. ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 21 of 36...
Page 22 BOSE MA12™ MODULAR ARRAY Bose MA12 array is a one-meter tall speaker module consisting of twelve closely-spaced high-output 2.2" (6 cm) drivers operating over the frequency range from 120 Hz to 16 kHz. A...
Page 23 OTHER LINE-SHAPED SOURCES the last section, the unique decisions and choices Bose made in designing the innovative MA12™ modular array were discussed. However, there are other line-shaped sources already available. How do they compare to the MA12 ? Column speakers line-shaped sources have been around for a long time.
Page 24 These speakers behave more like conventional loudspeakers, albeit with narrower vertical radiation patterns. ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 24 of 36...
Page 25 Bose in the case of the MA12™ array . The goals in creating the MA12 were exceptionally high acoustic output from an ultra-thin baffle area, a wedge-shaped radiation pattern and gentle fall off of sound characteristic of cylindrical waves, and wide horizontal dispersion in a lightweight, modular, architecturally unobtrusive, and affordable package.
Page 27 The other approach is shown in Figure 15, where everything is covered from the front. ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 27 of 36...
Page 28 MA12™ speaker for the main floor and a delay speaker for the balcony on delay. Figure 15. Alternatively, the balcony can also be covered from the front. ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 28 of 36...
Page 29 SAMPLE PROJECTS the end, what convinced Bose to develop the MA12™ speaker was the enthusiastic feedback we received from many of our field engineers around the world whom for several years had been designing and installing custom line arrays. What are now obvious applications for the MA12 –...
Page 30 Vatican. He used seven Bose Model 25s to create a custom line array. Fifty-six of these arrays were placed at speaker locations allowed by the Vatican. One of the arrays is shown in Figure 17.
Page 31 Massaa, which has a reverberation time of about seven seconds. A view of the Massaa is shown in Figure 19. ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 31 of 36...
Page 32 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.
Page 33 The system was installed and the performance determined to match what was heard through Auditioner. ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 33 of 36...
Page 34 Careful examination of Figure 21 will reveal the locations of the line arrays he created. A close up of the array – made of sixteen Bose Model 101s – is shown in Figure 22.
Page 35 Our German colleagues say that the line arrays are particularly insensitive to feedback, a problem the church was experiencing regularly with their old system. ® Bose MA12™ Modular Array: Technical Foundation & Discussion April 2002, © Bose Corporation, All Rights Reserved Page 35 of 36...
Page 36 – has properties that address many of the weaknesses of the hang-and-tilt approach, and are practical to build. Bose has undertaken the development of such a source based on the extraordinary results obtained with custom-made versions of line sources in a wide variety of facilities throughout the world, including acoustically challenging facilities.

Bose Panaray MA12 Technical Foundation & Discussion

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