JBL Professional MTC-48TRx12 Tile Rail can be used with any JBL ceiling speakers having the C-ring/tile-rail mounting system. These include: Control 24C/CT Micro & 24CT MicroPlus, Control 24C/CT, 26C/CT, 19CS/CST, Control 47C/T, 47LP, 47HC, 40CS/T, 42C, Control 226C/T, and 8124/8128. Not for JBL speakers that install with tile bridges (such as CSS Series, 8138, C227C/CT, C300 Series models). Check with JBL Professional Customer Service for most up-to-date compatibility list.