Array Applications; Speech Systems - JBL Application Engineered Series Application Manual

Array Applications

The arrays described in this guide are developed to meet the performance goals of a wide
variety of applications. Array recommendations are largely dictated by the intended function of
the sound system along with the size and shape of the room. For this discussion, we will divide
the function of the sound system into three broad categories: Speech, Speech & Music, and
High-Impact Music, and describe some typical solutions to three common room types.
Referenced array types begin on page 13.

Speech Systems

A speech-only system's primary function is to provide good intelligibility throughout the
room. For these systems, there is more of a tendency to use a center cluster system or a
more distributed approach since cost and evenness of coverage are generally driving
factors in the design. Center clusters provide good localization to the talker. Delay fills
improve gain before feedback and coverage, but at an increased cost. These systems
are typically run in mono mode.
Figure 1: Array B3 (p. 19) as
Center Cluster in small theater
For small to medium sized rooms, Application Engineered™ two and three-way arrays
are most appropriate. A simple single-tier solution such as array types B or C may be
appropriate if the vertical coverage requirement is less than 50 degrees (see Figure 1).
Larger rooms require higher SPL levels, better directivity, and usually a two-tiered array.
In these cases, clusters that include the AM6340 or the PD5322 will provide the levels
and broadband directivity to make these systems successful (see Figure 2).
For fan-shaped rooms or larger auditoriums, a three- or four-cluster system provides
more consistent horizontal coverage and better localization to the stage. Systems
designed primarily for speech should have as little overlap as possible between adjacent
clusters. These systems can also improve coverage close to the stage (see Figures 3, 4
& 5).
Figure 2: Array E4 (p. 26) as Center
Cluster with AM4212 fill speakers in
large auditorium
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