Garmin GMA 245, Pilot'S Manual

190-01879-10  Rev. F

Garmin GMA 245 Pilot’s Guide

16

GMA 245 Audio Panel

SPEAKER

  NOTE:  

Speaker audio turns off in circumstances where aircraft power 

falls below 11 volts.

All of the radios can be heard over the cabin speaker.  Pressing the 

SPKR

 Key selects and deselects the cabin speaker.  Radios are muted to 

the speaker when a COM microphone is keyed.  Aural alerts and warnings 
are always heard on the speaker, even when the speaker is not selected.

3D AUDIO

3D Audio is useful when multiple audio sources are present.  By using 

different responses in each ear, 3D audio processing creates the illusion that 
each audio source is coming from a unique location or seat position.

Because this feature uses different signals for left and right channels, it 

requires wiring for stereo intercom and stereo headsets.  If 3D audio is 
activated when mono headsets are in use, the listener will still hear all audio 
sources; however, there is no benefit from location separation.

With a single COM selected and 3D Audio enabled, the listener hears 

the audio source at the 12 o’clock position.  If both COMs are selected, 
the listener hears COM1 at 11 o’clock and COM2 at the 1 o’clock position.   
All other intercom positions are processed to sound like their relative seat 
location.  By default, the GMA 245 assumes the pilot sits in the left seat.  
Refer to the GMA 245 Installation Manual to make changes to the default 
configuration.

ENABLING 3D AUDIO

Press and hold the 

PILOT

 Key to toggle 3D audio processing on and off 

for all headset positions.  When 3D Audio is enabled, the aural message 
“3D audio left” is heard in the left ear followed by “3D audio right” in the 
right ear.  If the aural messages are not heard in only the left and then the 
right ear respectively, the cause may be aircraft wiring or headset settings.