Digital PA systems are suitable for large public areas and across multiple sites, with features like audio prioritization, DSP, ambient noise control, and the ability to incorporate multiple paging stations. These systems can handle applications in large venues like airports and casinos as well as multi-site installations over IT networks. Specific products include compact frames for smaller systems, MF4 modular frames that can run up to 256 zones, and paging panels for announcements and intercom functionality available in desktop and rackmount versions.