Abstract: A sound system comprising a planar array of at least two sound producing elements and a digital control for controlling the focus of the array. Each element in the array is fed the same signal, but delayed in time according to each element's position in the array. Proper selection of time delays result in the audible signal from each element in the array arriving at a given target area coincidentally and coherently, whereas at any other location the signal does not arrive coincidentally, so that, at all but the target area, the sound signals are incoherent and do not add up to the volume that is achieved in the target area. The arrangement of sound elements in a flat planar array allows for the speaker system to be more easily concealed in a floor, wall or ceiling, as well as suspended from above.