My RV-7 has dual G3X and GNS 650. Without an Audio panel or Audio Amp, the audio alerts from the G3X cannot be heard above a whisper. I ordered a $3.50 mono audio amp on Amazon,
Tda2030 One-channel Mono 15w Ac / Dc 12v for Audio Amplifier Board
Sold by: green_tree
the input was from Pin 1 on the G3X, power to the amp by the same G3X CB, and output to one side of the stereo phone plug with a 330 Ohm resistor inline. Works great!
Gary Brown
DAR - NW USA
Tda2030 One-channel Mono 15w Ac / Dc 12v for Audio Amplifier Board
Sold by: green_tree
the input was from Pin 1 on the G3X, power to the amp by the same G3X CB, and output to one side of the stereo phone plug with a 330 Ohm resistor inline. Works great!
Gary Brown
DAR - NW USA