The special feature of this setup was the B 21A, which were operated in “cardioid” mode under the centre of the stage. A classic cardioid directional sound dispersion pattern for woofer systems is achieved by arranging three subwoofers in a 2:1 ratio with appropriate DSP-supported control. This means that two subwoofers are directed towards the audience and one subwoofer is placed backwards. This significantly reduces the level of the sound that is emitted to the rear, e.g. onto the stage. Under half-room conditions, such as outdoors, a rearward attenuation of up to 20 dB can be achieved. This results in less unwanted sound and a differentiated and precise reproduction. The B-Line subwoofers from SE AUDIOTECHNIK, equipped with integrated DSPs and amplifiers, already have everything on board that is needed for a “Cardioid” arrangement. Simply select the “Cardioid” mode and set up the speakers as described. The subwoofers will take care of the rest.