Dynon SV-INTERCOM-2S Installation And User Manual page 14

Figure 6: SV-COM-T25/T8 Wiring Diagram
* == 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
shield (which is also grounded at pin 1) at the intercom end of the harness is a suitable way to accomplish this goal.
SV-INTERCOM-2S - Installation and User Guide, Revision B Page | 11