Abstract: A device known as a parametric array employs the nonlinearity of the air to create an extremely directional audible sound from inaudible ultrasound.Comparing with the traditional loudspeakers of similar size,the extremely directional beams over a broad range of audible frequencies can be fromed.In this paper,an analog system is introduced after outlining a basic theoretical analysis of the audio beam loudspeaker.Detail results of acoustic measurements such as frequencies response,directionality and total harmonic distortion,are analyzed and interpreted.The further work is also put forward.