Bose Panaray MA12 Technische fundering en discussie - Pagina 21

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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.

Bose

MA12™ Modular Array: Technical Foundation & Discussion

Page 21 of 36