The Tannoy CMS 603ICT PI is a pre-install, full-range 6-inch ceiling loudspeaker from Tannoy's third-generation Ceiling Monitor System (CMS 3.0) family. It is specifically designed for background music and paging in professional applications such as airports, hotels, and retail outlets. The loudspeaker features a proprietary ICT (Inductive Coupling Technology) point-source driver that provides extended frequency range, consistent broadband directivity, and enhanced voice intelligibility.

The ICT driver design utilizes wireless electromagnetic coupling for the high-frequency element, which removes the need for a crossover and enhances long-term reliability for continuous usage. The "PI" (Pre-Install) designation indicates that this model is supplied without the back-can, which is sold separately, allowing installers to fit the back-can during the construction phase.