Ceiling-mount adapter allows control contractor series loudspeakers to be installed hanging down from a ceiling or beam. The adapter does not come with a base and requires the use of existing Invisiball base (which comes with loudspeaker). Use when adjustment near perpendicular to the axis of the lantern clamp is required. Attach CM shaft through hole in lantern clamp, tighten nylon nut and secure with jam nut. Control 23 requires flat washers on both sides of lantern clamp hole.