Array of acoustical returner devices to reflect sound back in the incident direction

A plurality of tri-rectangular tetrahedrons are mounted in an array to reflect sound waves back to their source. The array filters out the acoustic range below the normal range of frequencies for the spoken voice. The array is combined with a sound absorber to absorb frequencies the user does not want to have returned to the source. One example of such absorbers consists of rendering the returner somewhat porous with microperforations or microslits so that sound waves below the desired frequency range can travel through the porosity and into an absorbing area which may include fiberglass or other sound absorbing fabrics. Examples of environments of use for the present invention are an office setting or nursing station in which a large room is divided up into spaces or cubicles by partitions. Acoustical returners can be mounted above each space or cubicle, for example, in ceiling mounted arrays or clouds above each space or cubicle.