The Pioneer DJ XPRS15 are enclosed in 15 mm birch plywood cabinets to deliver a natural, dynamic sound. Pioneer's patented AFAST technology drastically reduces standing waves that can produce a muffled response in the low to mid ranges. An acoustic tube in the cabinet absorbs just the standing waves, increasing the low frequency response. The XPRS15 uses lightweight 15-inch ferrite LF drivers and 1.75-inch titanium diaphragm compression drivers.