An omni-directional acoustic deflector, comprising: an acoustically reflective body having a truncated conical shape including a substantially conical outer surface configured to be disposed adjacent an acoustically radiating surface of an acoustic driver thereby to define an acoustic radiation path therebetween, wherein the acoustically reflective body has a substantially parabolic profile such that a cross-sectional area of the acoustic radiation path increases monotonically and in a nonlinear fashion with respect to a radial distance from a motion axis of the acoustic driver which is coincident with the axis of the acoustically reflective body, such that a second separation between the acoustically radiating surface and the acoustically reflective body at a second distance to the motion axis, is greater than a first separation between the acoustically radiating surface and the acoustically reflective body at a first distance to the motion axis, the second distance being greater than the first distance, wherein the omni-directional acoustic deflector comprises a plurality of legs for coupling the acoustically reflective body to the acoustic driver, the omni-directional acoustic deflector being further characterised in that the acoustically reflective body comprises a plurality of radial extensions, each extending into the acoustic radiation path from the acoustically reflective body to a respective one of the plurality of legs, such as to disrupt a circular symmetry of the acoustically reflective body around its center, and thereby reduce the ability of the acoustic radiation path to support circularly symmetric modes. an acoustically reflective body having a truncated conical shape including a substantially conical outer surface configured to be disposed adjacent an acoustically radiating surface of an acoustic driver thereby to define an acoustic radiation path therebetween, wherein the acoustically reflective body has a substantially parabolic profile such that a cross-sectional area of the acoustic radiation path increases monotonically and in a nonlinear fashion with respect to a radial distance from a motion axis of the acoustic driver which is coincident with the axis of the acoustically reflective body, such that a second separation between the acoustically radiating surface and the acoustically reflective body at a second distance to the motion axis, is greater than a first separation between the acoustically radiating surface and the acoustically reflective body at a first distance to the motion axis, the second distance being greater than the first distance, wherein the omni-directional acoustic deflector comprises a plurality of legs for coupling the acoustically reflective body to the acoustic driver, the omni-directional acoustic deflector being further characterised in that the acoustically reflective body comprises a plurality of radial extensions, each extending into the acoustic radiation path from the acoustically reflective body to a respective one of the plurality of legs, such as to disrupt a circular symmetry of the acoustically reflective body around its center, and thereby reduce the ability of the acoustic radiation path to support circularly symmetric modes.