This document summarizes and compares three digital PA systems: the Compact Frame, MF4 Frame, and Paging Panels. The Compact Frame is a smaller scale system that offers a fully summing audio matrix with broadcast quality audio and is expandable up to 64 Dante channels. The MF4 Frame is a modular system that can run up to 256 zones and supports various audio formats and I/O as well as GPI/O. The Paging Panels are used for making announcements and listening to audio as well as logic control and offer an integrated intercom system. These systems are suitable for large public areas, transport hubs, and multi-site applications.