Description The KF913F is a dedicated high frequency medium throw/downfill module engineered for use with Phased Point Source Technology™ digital signal processing in the creation of PPST™ arrays. It provides coverage from 0° to -45° below the horizontal axis with flat frequency response. Usable frequency response is provided to -60° below the horizontal axis. The system comprises three cells of a specially designed 2 in exit/3 in voice coil compression driver loaded on a 30° horizontal coverage SimplePhase™ horn. The compression drivers specified for the KF913F are specially engineered to accept up to 20 dB additional input at 10 kHz as part of EAW\'s HF pre-emphasis technique. HF pre-emphasis helps the KF913F provide high frequency perception at distances in excess of 400 feet. Sophisticated horn-loading technology allows the KF913F to provide focused downfill coverage without "breaking" the bottom of the enclosure. The lowest cell\'s high frequency compression driver employs a near instantaneous reflection off the top of the cell to gain additional "bend" to reach 60° below horizontal. Because the enclosure\'s bottom is sealed the downfill element can be placed at any location in the array -- not only on the bottom row. SimplePhase™ horns were specially designed to facilitate the PPST™ process. Horizontal coverage is an idealized 30° over the entire operating bandwidth. Unlike Virtual Array Technology\'s complex horn flares designed for control of individual drivers the simple lines of the SimplePhase™ horns produce phase-coherent summation with other drivers within the module.

Applications The KF913 PPST™ medium throw/downfill HF module is engineered for use only in KF900 Series arrays implementing PPST™ digital signal processing. It is not intended for stand alone use of any kind. The KF913F combines some of the long throw capabilities of the KF910F with the downfill coverage of the KF911F to create a single enclosure that satisfies both needs. This enables the use of PPST™ arrays for indoor venues such as smaller arenas outdoor amphitheater (sheds) and even performing arts centers. Maximum throw is around 400 feet. Because the enclosure\'s bottom is sealed the downfill element can be placed at any location in the array -- not only on the bottom row. This is particularly important in portable applications where optimal trim height cannot be attained. In such a case the HF downfill element can be raised to increase the distance between it and the nearest listener. In stadium and arena applications where the highest seats are above the array an inverted KF913F can provide "up-fill" coverage. Except in such cases it should not be used with either the KF910F or KF911F modules.