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Bose Panaray MA12 Technische fundering en discussie
Figure 11. In a side view, the sound radiation is limited to a region
between a plane perpendicular to the top of the array and one
perpendicular to the bottom of the array. The sound does not radiate up
to the ceiling and upper walls where reflections cause more
reverberation and lower intelligibility.
Next, consider the fact that the intensity falls off much more gently with distance than a
conventional spherical-wave speaker. This means the source can be placed in locations where
a conventional source would produce far too much level variation in the audience. A line
source placed at ear height maintains a relatively consistent level throughout the audience
area. Variations in level have not been completely eliminated, but the drop off of level with
distance is perceived as modest over a very large audience area.
Consider the amount of engineering effort needed to create a system using line sources.
Design would be radically simplified, because it reduces to ensuring that the audience is
within the wedge-shaped radiation pattern. To do this almost always means locating the line
source along a wall at ear height. None of the effort needed in a traditional hang-and-tilt
design to carefully select, locate, and aim speakers, or to design multi-speaker clusters, is
involved. Nor is the need to design complicated and expensive rigging. Or to undertake
expensive installation work. After-installation tuning time is reduced because line sources are
not used in clusters, and service is drastically simplified because the speakers are located at
ear level and are therefore easily accessed.
Furthermore, a line source can be as slim as a few inches so that when it is mounted to a
wall, it can virtually disappear. There are no speakers hanging from the ceiling and no
awkward clusters to hide. In many situations, this represents a major improvement in the
physical impact imposed by a sound system on its environment.
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Bose
MA12™ Modular Array: Technical Foundation & Discussion
April 2002, © Bose Corporation, All Rights Reserved
Page 21 of 36