L-3212 line array speaker is a three-way system drived by 6 loudspeaker unites. it can returm the sound 40hz-18khz frequency part with smooth frequency andphase response. two pieces 72mm voice coil neodymium midrange unit and two pieces 12" neodymium magnet woofer form a great combination system with a high dynamic power,and provide high sound pressure but minimunsize the size and weight. lowfrequency part is a pair of 600w 12"woofer, a pair of lowfrequency part of the 8"400w woofer,and they are separate drived. high-frequency part is one pair of 180w 75mm voice coil compression unit, combines with a wave-guide of 108x8, produce a coherent wavefront. compression units of up to 145db even through a very small box.