Compact unidirectional aluminum baffle/enclosure with one-piece grille provides long lasting service indoors or out. Sturdy assembly features a spun .038 aluminum housing and mounts easily to walls, ceilings, or to 4" (102mm) octagon E.O. boxes (manufactured by others). Model 410-4 accommodates a standard 4" (102mm) loudspeaker. Baffle interior is undercoated and patchjute lined to prevent mechanical and acoustical resonance. Assembly is finished in satin aluminum.