Dynon Avionics SV-INTERCOM-2S - Manual (Page 12)

Installation
2-4 SV-INTERCOM-2S Installation and User Guide - Revision A
* == While the audio grounds labeled with a * ultimately come back to the main ground on pin
1, they should NOT be wired directly from the source audio device to any ground (pin 1 or
otherwise) directly. Instead, to minimize noise and interference, their ground lines should be
routed with their audio signal inside the required shielded cable as far as possible and
connected to ground as close to the intercom as possible. Connecting these grounds to the