The AA21-400 Cabin PA Controller is designed to provide centralized control for an aircraft's internal and external PA systems.

Contained in one panel mounted unit with an illuminated faceplate, the AA21- 400 is able to provide both low level and high level (speaker) outputs that are more than adequate to support most public address and cabin paging applications.

All audio and keylines are interfaced to existing aircraft audio systems. The AA21-400 can be configured to have either the radio receive input or the CD input enabled. Radio RX/CD audio or PA mic inputs are selectable on the front panel. Adjustable sidetone is provided for the mic input, and a PA output with adjustable level is available.