SSB-4 is a rust-resistant steel, load-bearing support for 4″ O.D. loudspeaker assemblies in a drop-tile ceiling grid. Easy “mark & cut,” “square” hole design for fast and efficient installation. Multiple seismic tie-off points are provided. Tinnerman clips provide easy screw threading, quick-mount tabs hold the back box in place without screws and locating tabs provide secure mounting positions in ceiling tiles.