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B-2 adopts 2-way neodymium driver design: double 18 inches neodymium drivers, heart-shape diffusion design, eliminate unnecessary sound power lose, effectively reduce echo area and reproduce LF signals. B-2 could be combined with different types as sound supplement of the array system, for example stacking or hanging over, individually hanged over J-8 or operate as a seperate volumn. Brich wood enclosure, strong metal grill with 4 handles on 3 sides, double EP5 or NL8 parallel interfaces design;