- ページ 6

スピーカーシステム Bose Panaray MA12のPDF テクニカル・ファウンデーション＆ディスカッションをオンラインで閲覧またはダウンロードできます。Bose Panaray MA12 36 ページ。 Modular line array loudspeaker
Bose Panaray MA12 にも：ユーザーマニュアル (2 ページ), インストレーション・マニュアル (16 ページ), インストレーション・マニュアル (8 ページ), インストレーション・マニュアル (7 ページ), サービスマニュアル (11 ページ)

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

Spherical-Wave Sources

72dB

78dB

Page 6 of 36

84dB

90dB