Hyperfold 4x15" Horn-Loaded Upper Bass Speaker 4000W Blk/RedThe urge to dance predominantly comes from the upper bass frequencies, where the kick and finer details of the bass are found. As a dedicated enclosure responsible for the critical upper bass speed and articulation, the Hyperfold has multiple drivers to keep up with the extraordinary efficiency of all the other elements within the Incubus system. When arrayed, two Hyperfolds paired in the upper bass region deliver an output far beyond comparable sized