VF matrix system consist of full range professional loudspeaker VF153 and subwoofer VF181. They adopted 3BDIO proprietory high-grade components and new idea for the passive crossover networks, which can satisfy different kind of sound performances under processor and software though your computer. VF153 is impressing on high SPL, wide frequency response and coverage angle, long-excursion delivery, and the coherency on the H/M/L frequency, This combination can avoid the problem in traditional speaker that can't provide a quality sound to every seat. Under the volume and clarity demanded by today's concert, sports and special events in a large arenas, stadiums, it will be required to rig many of them according to the practical need.