Isolating Digital Noise, need help.

I hooked up the Pangea PC to the ARC CDP and I'm getting the same high-pitched noise as with the Audience cable.
 After several A/B tests, there is noise when using the stock PC, but less audible than with aftermarket cables.

So it leaves me to wonder if I should try an isolated power strip. Right now all my components run thru the Blue Circle and then to a Furman EMF/RFI strip except for the amp. Or is there a filter or power cord for digital devices?

Do you get any noise when only the amp is in the system and on, of course?

Is it possible to try a different outlet without the extension cord?

@tbg , no, amp is quiet.

@jond, I'll try that today, the cable from the Furman may reach across the room.
Thanks.

Lowrider, I had previously suggested trying the CDP’s stock power cord on the preamp. However, given that it is now evident that the CDP’s stock power cord doesn’t fully eliminate the problem when used on the CDP, what I would suggest is that you try connecting the CDP with the Audience power cord in series with the long extension cable (which eliminated the problem when plugged into a distant outlet), plugged into the **SAME** AC socket you normally use for the CDP.

And if that resolves the problem but also results in any adverse sonic effects, try putting the extension cord in series with the preamp’s power cord instead, plugging it into the same place as usual.

Keep in mind that when you eliminated the problem by connecting the CDP to the distant outlet you changed two things at once, namely using the distant outlet, and putting the extension cable and its undoubtedly significant inductance in series with the CDP’s power cord. At this point we don’t know which of those variables eliminated the problem, but it very conceivably could be either of them (or both).

Best regards,
-- Al