1.Mc7550b professional conference speaker has unique appearance. 2.It has a variety of installation methods: 5 speakers combined into five angle shaped for lifting of installation or alone in the ceiling. 3.It applies to large and medium small sized conferences, it widely used in the banquet hall and classroom and other occasions for expand the volume. 4.Used the ring array speaker in the center of meeting room, participants will hear the clear sound or wonderful background music at any angle. * frequency response:80hz-30khz * amplifying power:200w * peak power:400w * sensitivity:90db * high frequency 3/4inch(100mm) * low frequency 6.5inch(double) * size(h*w*d):485mm*255mm*220mm * n.W:6.5kg