The BL series is developed by applying advanced European electro-acoustic design concepts, delivering exceptional performance that meets high-level sound reinforcement requirements. The birth of the BL series also exemplifies Audio's pursuit of superior sound quality. Custom European-imported inductor copper wire, non-inductive ceramic resistors, flame-retardant fiberglass boards, European-customized DN (R-CU57) purple copper foil-laminated PCB boards, and uniquely customized polypropylene capacitors—the crossovers of the BL series speakers are all crafted with custom components, ensuring high sound density, sweetness, and stability.