Do you recognize this noise?

Anybody recognize this noise?

192 - X73i Line Input - X73i Line Output - 192 (NOISE)
192 - X73i Line Input - X73i Line Output - Coleman Monitoring (NOISE)
No Line Input - X73i Line Output - 192 (SILENT)

192 - Daking Line Input - Daking Line Output - 192 (SILENT)
192 - Daking Line Input - Daking Line Output - Coleman Monitoring (SILENT)
No Line Input - Daking Line Output - 192 (SILENT)

All of the gear is installed with patchbays. I've checked my wiring ten times over to make sure it is correct. I've tried cutting shields at inputs and outputs on the 192, patchbays, and x73i.

The noise only appears when the 192 output is connected to the X73i line input. It only appears once ProTools boots up. It is the same for both X73i's I have. Audio still passes through the unit.

Any help is greatly appreciated!

Attached Files

NOISE.mp3 (76.6 KB)