Polar Focus® Wall Mount WMS-H4850 is a Wall Mount designed to allow for the speaker to be able to swing out of the primary centered position, and come to rest at a -90 degrees or a +90 degrees position. This design characteristic was required so that a lighting truss would not interfere with the wall mounted speakers when the truss was lowered to service the lights. [break] Center, right, and left positions have detents to allow the arm to settle into those three positions. The swing arm carrying a speaker can be easily moved with a painter`s pole. The end of the swing arm can receive a Zbeam® arm, or a yoke (u-bracket) for mounting a speaker. [break] Pro audio rigging design, roof attachment, supplemental structure, sales, support and PE stamped drawings in any US State provided by Polar Focus. Call us today for more information at (413) 586-4444.