Mircom MA485A Speaker Type Amplifier

The MA-485A is a communications amplifier designed for communication between the IS-489 suite stations and the vestibule (lobby) panel, as well as selective door opening. It incorporates an Automatic Level Control (ALC) circuit that provides clean, clear voice communication in both directions. The MA-485A amplifier provides AC (buzzing) and DC (silent) door strike action. For multiple vestibule applications, RL-401A relay units are required. One RL-401A relay unit is required for every two vestibule used.