The SX-212 have double 12"LF unit, double 2" compress driver. The systemadopt advanced branching map technique, made MF and LF output the samequality SPL. The line array speaker system took over us more than 3 yearsto develop and improve. The speaker box and loudspeaker also are waterproofit's suitable for outdoor place. lt meets the need for a high power, high bassimpact system that is versatile and scalable for a very wide range of applications in the live sound, corporate and fixed installation fields.