An acoustic projector includes a toroidal whistle having an annular mouth and a foot set in a bowl like reflector. The reflector extends radially outwardly from the foot and has a concave section circumscribing the annular mouth. A whistle bowl is configured to suppress turbulence in air flow and thereby provide laminar flow to an outlet jet orifice into the annular mouth. The concave section is shaped to reflect isophasic sound generated at the mouth in a coherent beam.