"A" Speaker truss -is-a large-scale projects, designed to perfect the performances added effect, mainly for large-scale movement of outdoor performances, exhibitions, press conferences. Use it to hoist a more linear sound nice style results. Up to over 10 meters high, It can load about 1 ton ,The "A" speaker truss height which usually on 6m (load 0.5 Ton ),8m (load 1ton ),12m (load 0.8 ton ),It also can be customized according to customer .