The W-12 have double 12"LF unit, double 2.5"compress driver. The system adopt advanced branching map technique,made MF and HF output the same quality SPL. The line array speaker system took over us more than 3 years to develop and improve. The speaker box and loudspeaker also are waterproof; it's suitable for outdoor place. It meets the need for a high power, high bass impact system that is versatile and scalable for a very wide range of applications in the live sound, corporate and fixed installation fields.