I found that if my DVD player I use as a transport (Marantz DV18) is on, it sometimes produces a similar high pitched whine when I'm listening to my SACD player, which uses Nordost Quattro Fil interconnects, particularly if I have a disc in the DVD player. No problem with my other digital sources, which are using very heavily shielded interconnects. Sound goes away when I turn off the DVD player. I think that, combined with the Nordost's lower shielding protection, is the culprit in my system, and it may be in yours as well. DVD players tend to send out a lot of RFI or similar interference by themselves when they are on, more so than CD players, in my experience. Curious to see if that's the explanation in your system.
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