Loudspeaker Controller


Maximize performance and reliability of your aircraft’s loudspeaker system.

AEM’s AA21-400 Cabin PA and Siren Controller is a single, panel-mounted unit that provides a simple interface to all generations of AEM’s loudspeaker amplifiers and speakers. It maximizes the performance and reliability of your aircraft's PA system with state-of-the-art design, improved frequency response, and an optimized microphone input circuit.

Integrators will appreciate the AA21-400's simple interface with existing aircraft audio systems. We also made the unit configurable to receive either radio or CD audio, allowing for radio rebroadcast capability or playback of recorded information.



  • D0-160D
  • DO-170
  • TSO-C50c

Product Images


  • Optimized microphone audio input circuit
  • Field-adjustable audio inputs
  • Selectable wail and yelp siren
  • 25-watt internal speaker amp
  • Available in standard configurations or customized panel layouts, with 5 Vdc or 28 Vdc standard white lighting,
  • Optional NVIS lighting

Mechanical Specifications

Mechanical Specs
Height 1.12″
Width 5.75” at the front, 4.97” at the rear
Length 6.33” excluding mating connectors
Weight 1.4 lbs MAX

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