The Atlas 510-8 8 inch Cylindrical Bidirectional Baffle Enclosure is identical to the 410 Series with the addition of a circular mounting canopy complete with mounting hardware and second grille to enable bi-directional sound dispersion. The 510-8 mounts a standard 8" (203mm) loudspeaker (will not work with 8W Transformer). Aluminum housing is patch-jute lined and undercoated to allow clear, audible loudspeaker performance by preventing mechanical and acoustic resonance. One grille per unit includes studs for convenient loudspeaker mounting. The complete assembly installs to a 4" (102mm) octagon E.O. box and is finished in satin brushed aluminum.