A powerful system for comprehensible air-to-ground communication.

AEM's 850-watt Public Address and Siren System effectively compensates for the high levels of noise and rotor wash common in medium and large helicopters. Comprehensible speech, delivered with high-flexibility dispersal patterns, is attainable up to 1000 vertical feet when using multiple speaker arrays.

The 850W legacy system has been used on such helicopters as the EC225, S-92, and Mi-17. Installation of our V33-002 voltage converter directly beneath the PA700 series amplifier boosts the output power from 700W to 850W with no additional installation material required.


  • Front-mount auxiliary input allows message transmission from an MP3 player or smartphone
  • Convenient onboard digital storage for fast recording and playback
  • Solid-state unit contained in a durable, black anodized aluminum chassis
  • Voltage converter boosts the output power from 700W to 850W
  • Enhanced reliability with a built-in protective circuit
  •  Field-replaceable driver assemblies and mechanical parts 
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PA700 Series Power Amplifier with VR33-002 Power Conversion Device
LSC22 Loudspeaker Controller
AA21-4xx Series Controller
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Controller Mechanical Specs
Height 1.11"
Width 5.74"
Length 6.32"
Weight 1.30 lb


Speaker Specs

Please refer to the TS9x Series Installation & Operation Manual.

Amplifier Mechanical Specs
Height 5.78" incl. connectors
Width 8.75"
Length 10.00"
Weight 9.90 lb
VR33-002 Mechanical Specs
Height 1.56"
Width 8.75"
Length 10.00"
Weight 3.90 lb

Installation & Operation Manuals


Product Brochure


Product Details Request Form

If you have a capability requirement that isn’t met by an existing system, AEM is open to new opportunities that meet the demands of both fixed- and rotary-wing aircraft. We work with flight crew, integrators, and OEMs to deliver solutions for today’s avionics market.

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