JBL AC26 AE Series Array Guide - Page 6

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 16. 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 5 (p. 20) as Center Cluster in a 60' deep theater showing +/-3dB averaged at 1-4 kHz. Figure 2: Array 12 (p. 25) as Center Cluster with AM5212 delay fill speakers in large auditorium 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 5 or 6 may be appropriate if the vertical coverage requirement is less than 60 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 AM7315 will provide the required volume, impact levels and 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). 6