Pilots can select audio from transmit (TX) and receive (RX), LIVE, KEYED, or voice activated (VOX) intercom, in addition, handheld microphone transmission and pilot isolation/emergency operations are also provided. 

This AMS43 single-channel audio controller is TSO certified.

Features:

• Audio Controller provides transmit and intercom capabilities for pilot and co-pilot, plus intercom for four up to passengers
• Panel controls include master RX volume, ICS volume, and ICS squelch (VOX adjust)
• ICS Tie line provided to allow multiple controllers to be networked
• Select between COM1, COM2, AUX, FM1, FM2, PA, NAV1/2, ADF1/2, DME/MKR inputs
• Transmit capability for five COM channels with auto-receive functions
• Receivers select switches allow for first four COM channels
• High headphone output provides up to 500mW per channel
• Intercom supports two crew and and passenger stations
• Active Noise Filtering (ANF) intercom system
• Voice activated (VOX) squelch
• Two direct inputs are provided to accommodate functions such as Rad Alt, GPS Alerts, Low 
• Rotor, or Telephone Ringer
• Front panel selectable emergency mode switches the pilot's headphones directly to selected radio
• Three internal alert tone generators: single-tone, two-tone, and timed siren