JBL AC26 AE Series Array Guide - Page 7

Figure 3: Array 14 (p. 27) used as an exploded cluster in a fan-shaped room For larger center clusters arrays 10, 11, or 12 may be considered. For three- and four-cluster systems as described above (see Figure 3), the vertical arrays of rotated enclosures, arrays 13, 14, and 15, are particularly useful given their low profile and excellent polar characteristics. The stacked LF drivers of these arrays combine to increase LF power and directivity, greatly improving gain before feedback on lower performance areas. Combination Speech & Music Systems A majority of sound reinforcement projects fall into this category. Here, all the elements associated with a successful speech system (evenness of coverage, consistent pattern control, and good intelligibility) need to be combined with a system that goes lower in frequency and provides greater impact. These systems benefit from a strong proscenium system to provide source localization to the stage and solid low-frequency support. The preferred configuration of these systems is often an exploded arrangement, although other building constraints or preferences may dictate otherwise (see Figures 4 & 5). Clusters must provide good directivity to lower frequencies in order to provide evenness of coverage and improved system gain before feedback. 7