A traditional circular exponential horn design to reproduce 50Hz is a large and unwieldy thing. A mouth diameter of 8 ft. is needed to couple 50Hz to the air and the exponential taper rate has to be chosen well below 50Hz. The DS-2P was designed to be arrayed together to create the large mouth necessary for concert sound and to be modular for easy truck packing. The DS-2P was designed to operate with a minimum of two cabinets placed together when on the ground or four cabinets together when flown in order to reproduce 50 Hz. In order to make the DS-2P enclosure as compact as possible, a hyperbolic square folded horn design was chosen.
Hyperbolic horns have more output closer to the cutoff frequency of exponential horns.
This allows for a higher cutoff frequency to be selected making for a shorter horn, however driver excursion increases rapidly below the cutoff frequency making electronic control of drivers critical. Square horns have more mouth area for the same diameter compared to round horns allowing a smaller size. Folding up the horn in the box can make it more compact, however folds can cause cancellations in the frequency response. The DS-2P has been very carefully designed so that it has no cancellations in its frequency response below 200Hz. Since a single DS-2P is unloaded below 100Hz, it was not included in the above table.