The HDL 53-AS is the perfect extension of the HDL 50-A system. This 3 x 12” subwoofer comes in the same housing as the HDL 50-A and allows perfect integration in the array shape. It can be flown above HDL 50-A in one array or as a separate sub-array behind the HDL 50-A array, with the same shape, to allow cardioid dispersion in a wide low and low-to-mid range and keep the stage clean from feedbacks.