An audio surround system particularly arranged for use in a theater provides the enhanced ambience and wide sound image advantages of a stereo enhancement system (SRS system) having directivity servos. A stereo enhancement system known as the "SRS" enhancement system enables a pair of relatively closely spaced speakers to provide a wide sound image lacking in any apparent point source and having enhanced directivity. A first SRS system (10) is modified for use with a set of front speakers (16, 22, 26) by increasing speed of its directivity servos, minimizing "pumping" caused by the increased directivity servo speed, increasing its threshold, and providing a bleed for minimizing reverberation effect. A similar SRS system (34) drives a set of rear speakers (40, 46, 50) and is differently modified to eliminate certain high pass filters, increase speed of its directivity servos, and to feed only ambience signals to left and right rear speakers (40, 46). Center sound, the sum signal from the rear SRS system (34), is fed to a sub-woofer (50).
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