VI series is a full range engineering speaker with imported B9C unit for good transient performance, low frequency with deep sound and high and middle frequency with clear sound. Its construction is processed by special design, such as reinforced speaker box by using imported birch to suppress low frequency resonance and strengthen low-frequency output. Low-frequency unit uses convection cooling technology to endure the higher power and enhance electroacoustic transformation efficiency and make its continuous working reliable for a long time. The speaker box surface is treated by water-resistant paint to make its finish more natural and bright.