JBL CSS-TR4/8x12 Tile Rails For Suspended Ceiling InstallationsThe JBL CSS TR4 8x12 tile rails are purpose built suspension hardware for integrating JBL CSS BB4 and CSS BB8 backcans into commercial and institutional suspended ceiling systems. Installers use these rails to secure in ceiling speakers at the ceiling plane without requiring tile cutting, speaker repositioning, or specialized riggingcritical for venues, classrooms, offices, and hospitality spaces where ceiling aesthetics and installation speed