so far there is no high-pitched noise when using the stock PC on the ARC. Perhaps the Audience PC is not a good design for a digital device?
The IEC connector is probably wired wrong. The Hot and neutral conductors are probably switched, interchanged. You can check it with a meter. Just check for continuity.
Simple way is to use the stock cord that came with the ARC CDP. Check plug blade to IEC contact for feed through continuity. Then compare the Audience PC to that. The ARC stock cord is the correct plug to IEC polarity orientation.
Also, I still need to work on the ground-loop problem between amp and preamp, and that will require a separate AC line.
If both the preamp and power amp are plugged into the same wall outlet duplex receptacle and you get a ground loop hum now, then more than likely you will sill get the same ground loop hum with a dedicated AC line.
Beats me how you can get a ground loop hum from the AC mains safety equipment grounding conductor if only one AC mains system equipment ground is involved. It takes two tangle. Where is the other AC mains system equipment ground providing the difference of potential, voltage, needed for the current flow to produce the 60Hz ground loop hum? No difference of potential, no current flow, no hum. What power cords are you using on the preamp and power amp? Stock, or aftermarket? If aftermarket try the stock cords that came with the equipment.
Is the audio system in any way connected to a Cable TV system or Satellite
dish system?
And what's with the power conditioner? You didn't mention anything about a power condition in previous posts. Try removing the power conditioner and plug the equipment directly into the wall duplex receptacle. Remove the ground cheater, check for ground loop hum.
