When bolted directly to the front of two Infrabass, the waveguide increases the output of the pair by up to 10dB at 33Hz. The additional loading provided by the Infrahorn significantly enhances both the efficiency and directivity of the Infrabass. Double Infrahorns can be used singly or stacked above each other in multiples to produce unprecedented low-bass performance. Where space permits, the Double Infrahorn represents a cost effective way of maximising Infrabass output, whether within the installed environment or for outdoor arenas.Typically used with F218, DS15 and DS210 in Dance Stack configurations.