Patent ID: 8111836

Claim:
A performance venue comprising: a defined area for locating an audience and performers; a main speaker system having an active zone within the defined area; a performance area within the defined area which is located outside the active zone; a low frequency directed audio source comprising a plurality of low frequency cone loudspeakers disposed for operation as an endfire array positioned and oriented for projecting sound into the performance area concurrently with operation of the main speaker system for cancellation of low frequency sound spilling over into the performance area from the main speaker system to produce a null zone within the performance area at a selected location and of a selected size, the endfire array having an enclosure extended in the direction of an intended axis of sound propagation with the enclosure having a central axis aligned with intended axis of sound propagation and the plurality of cone loudspeakers being disposed in the enclosure and centered on the central axis, the cone loudspeakers being located in the enclosure to have sealed back chambers and ported front chambers; an audio sensor located in the performance area for generating an output; and a control system for the main speaker system and the low frequency directed audio source using the output of the audio sensor as a control input for determining a dynamic delay for the low frequency directed audio source.