Usually, a reflector dish with a loudspeaker or a microphone placed at its focal point is used in directed acoustic systems to determine the direction in which the acoustic wave is transmitted or received, in addition to improve the gain in the acoustic transmission or reception. As the parabolic reflector dish with an oval aperture has significant advantages, and there is no relationship between parameters of this dish and some variables that have direct influence on acoustical emission or reception of this dish, this work is intended to find this relationship, and this is achieved by carrying out a theoretical and experimental study to find the optimum utilization of this dish in directed acoustic systems.