USA - Polar Focus has introduced the Rocker Zbeam - a new line array rigging system designed to simplify installation. Currently, with conventional rigging techniques, a two-motor rig is usually suspended from one dead hang point and a carefully bridled second point. The acoustic aim of the cluster and the coverage is dependent on the accuracy of the bridled rigging point, and in order to focus the system effectively, the bridled point may need to be adjusted several times. However, the Rocker Zbeam claims to solve this problem by using only two dead hang points. However, if bridles are used, then their accuracy is much less important. In either case, the cluster can be quickly rotated to achieve the desired horizontal angle. The key component is a rocker beam that keeps the centre axis vertical at all times, even if the two supporting hoists are not running at the same speed or offset. The centre of the unit has a large main axle and friction bearing, and a manually engaged disc brake is used to hold the pan (horizontal) angle. Scales are fitted to enable users to measure or check angles, and with a SWL of 1818kg it is suitable for most speaker systems.
(James Eade)
