Bose Panaray MA12 Technische Grundlagen & Diskussion - Seite 10

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Figure 3b. The effect of choosing a speaker with a radiation pattern

narrower than the audience is shown. People outside the main beam get

poor sound quality.

In situations where the radiation pattern from a single speaker is too narrow, another

speaker is usually added. When that is done, however, the same set of challenges is repeated.

Will the added speaker be able to just cover the area that was uncovered before? If it does, it

is coincidental. In general, the added speaker will again have coverage that is too wide or too

narrow.

Regardless, when two or more speakers are used to cover an audience area, their individual

radiation patterns must be overlapped in order to avoid a coverage hole between their

patterns. This interference zone, shown graphically in Figure 4, can result in significant and

audible dropouts of sound at some frequencies. Without careful selection of speakers, their

locations, and aiming angles within a cluster, there can be as much as 20-30 dB of energy

missing in the middle of the frequency range crucial for speech. These dropouts caused by

interference have a significant impact on clarity, intelligibility and tonal balance.

Bose

MA12™ Modular Array: Technical Foundation & Discussion

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