It is important to outline that the below sound pressures are to be achieved at a 1m./3.3 ft distance from the birds. In order to achieve this sound intensity on at least 150m./500ft. away, the sound at the source needs to be considerably higher compensating for the distance, the wind speed, and the other weather conditions. This requires the sound transducers to be able to focus the sound waves, as to minimize the loss of sound pressure and simultaneously to limit the noise outside the targeted area.