The ZM 2124 240W 6 Zones Powered Master Unit from RCF is a system main unit that includes a preamplifier with 6-zone selection and a built-in 240W amplifier. It is suitable for small systems, where the required power per zone is limited. It has input connectors for sources and can manage priority and route the two buses to the system zones. It includes an output level control for each of the 6 zones powered by the internal 240W amplifier. An additional external amplifier is needed to keep the music program in zones not involved by paging.