Bose Panaray MA12 Technical Foundation & Discussion - Page 6
Browse online or download pdf Technical Foundation & Discussion for Speaker System Bose Panaray MA12. Bose Panaray MA12 36 pages. Modular line array loudspeaker
Also for Bose Panaray MA12: User Manual (2 pages), Installation Manual (16 pages), Installation Manual (8 pages), Installation Manual (7 pages), Service Manual (11 pages)
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Figure 1. Sound from spherical waves radiates in all three dimensions:
up and down, left and right, and front and back. As a result, the sound
level decreases by 6 dB whenever the distance is doubled. The reason
for a 6 dB drop (and not something else) is readily understood, and is
contained in a footnote on page 16.
If the 6 dB per doubling of distance behavior is ignored for the moment, and the only
consideration were convenience, the easiest place to put a speaker in a typical room would be
a position in the front of the room with the speaker aimed toward the audience, as shown in
Figure 2a.
This placement, however, has a problem. In the example shown in the figure, the closest
listener is one meter from the speaker, and the farthest listener is twenty meters, a ratio of
twenty to one. This corresponds to a 26 dB difference in sound level, a very large level
difference corresponding to a perception that the sound at the farthest location is perhaps four
or more times softer than the front.
®
Bose
MA12™ Modular Array: Technical Foundation & Discussion
April 2002, © Bose Corporation, All Rights Reserved
Spherical-Wave Sources
72dB
78dB
8m
4m
Page 6 of 36
84dB
90dB
2m
1m