A rigging side frame for a loudspeaker which can be interconnected with rigging side frames of other loudspeakers for interconnecting loudspeakers in a stacked configuration, each interconnected loudspeaker having sides to which left and right rigging side frames can be mounted, the rigging side frame comprising: a frame structure having a plurality of splay angle selection pin holes, and a splay adjustment link stowing channel, at least one locking pins (50, 52), and an upwardly extendible splay adjustment link having a plurality of vertically extending splay angle slots of various lengths, each of said splay angle slots having a lower end, said splay adjustment link vertically movable in said splay adjustment link stowing channel between a linking position and a plurality of elevated splay angle positions, each of said elevated splay angle positions of said splay adjustment link associated with a splay angle of the frame structure of the rigging side frame of an adjacent loudspeaker relative to said frame structure, in said linking position said splay adjustment link is extended upwardly from said frame structure for pinning to the frame structure of the rigging side frame of a superjacent loudspeaker, and each of said plurality of splay angle selection pin holes of said frame structure is aligned with and spaced various lengths above the lower end of one of said plurality of splay angle slots, such that one of said at least one locking pins (50, 52) can be inserted in any selected one of said plurality of splay angle selection pin holes and one of said plurality of splay angle slots, in each of said plurality of elevated splay angle positions said splay adjustment link is elevated above its disposition in said linking position, and said one of said at least one locking pins (50, 52) is inserted in a selected one of said splay angle selection pin holes and in one of said plurality of splay angle slots, and is abutting the lower end of said one of said plurality of splay angle slots preventing further upward movement of said splay adjustment link, such that by pinning said splay adjustment link to the frame structure of the rigging side frame of a superjacent loudspeaker in said linking position, inserting one of said at least one locking pins (50, 52) in a selected one of said splay angle selection pin holes and in one of said plurality of splay angle slots, and elevating said splay adjustment link from said linking position to one of said plurality of elevated splay angle positions, the frame structure of the rigging side frame of an adjacent loudspeaker is set at a desired splay angle relative to said frame structure. a frame structure having a plurality of splay angle selection pin holes, and a splay adjustment link stowing channel, at least one locking pins (50, 52), and an upwardly extendible splay adjustment link having a plurality of vertically extending splay angle slots of various lengths, each of said splay angle slots having a lower end, said splay adjustment link vertically movable in said splay adjustment link stowing channel between a linking position and a plurality of elevated splay angle positions, each of said elevated splay angle positions of said splay adjustment link associated with a splay angle of the frame structure of the rigging side frame of an adjacent loudspeaker relative to said frame structure, in said linking position said splay adjustment link is extended upwardly from said frame structure for pinning to the frame structure of the rigging side frame of a superjacent loudspeaker, and each of said plurality of splay angle selection pin holes of said frame structure is aligned with and spaced various lengths above the lower end of one of said plurality of splay angle slots, such that one of said at least one locking pins (50, 52) can be inserted in any selected one of said plurality of splay angle selection pin holes and one of said plurality of splay angle slots, said splay adjustment link is extended upwardly from said frame structure for pinning to the frame structure of the rigging side frame of a superjacent loudspeaker, and each of said plurality of splay angle selection pin holes of said frame structure is aligned with and spaced various lengths above the lower end of one of said plurality of splay angle slots, such that one of said at least one locking pins (50, 52) can be inserted in any selected one of said plurality of splay angle selection pin holes and one of said plurality of splay angle slots, in each of said plurality of elevated splay angle positions said splay adjustment link is elevated above its disposition in said linking position, and said one of said at least one locking pins (50, 52) is inserted in a selected one of said splay angle selection pin holes and in one of said plurality of splay angle slots, and is abutting the lower end of said one of said plurality of splay angle slots preventing further upward movement of said splay adjustment link, such that by pinning said splay adjustment link to the frame structure of the rigging side frame of a superjacent loudspeaker in said linking position, inserting one of said at least one locking pins (50, 52) in a selected one of said splay angle selection pin holes and in one of said plurality of splay angle slots, and elevating said splay adjustment link from said linking position to one of said plurality of elevated splay angle positions, the frame structure of the rigging side frame of an adjacent loudspeaker is set at a desired splay angle relative to said frame structure.