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
  • Completely transistorized 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 
Controller Mechanical Specs
Height 1.11"
Width 5.74"
Length 6.32"
Weight 1.30 lb
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

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 pilots, integrators, and OEMs to deliver solutions for today’s avionics market.

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