A complete, recessed mount loudspeaker system designed for hard ceiling applications in clean room environments. The SYSTEM 21CR consists of an 8″ O.D. moisture resistant loudspeaker with a 10oz. magnet, a 5W, 25/70V transformer mounted on a round, steel, screw mount baffle and an 275 CID, round, steel backbox. Rubber gaskets are included between the baffle mount screws and the baffle, the baffle and backbox, and between the backbox and the ceiling. The baffle and enclosure have a white, powder coat finish with high durability that is resistant to scratches and typical household cleaning liquids.