I just picked up a bottlehead crack, and I am getting some interference through it. It was worse until I changed to a different plug, but the interference is still very audible when music isn't very loud. I am running rca to the Crack from my essence stx. The essence stx is setup with asio, bitperfect, playing media through jriver mc18. Just to test it out, I dug out some adapters and ran rca to the crack from the headphone out on the essence stx. The interference was completely eliminated that way, but unless I was hearing things, the sound wasn't as good from the headphone out to rca.
The rca cables are cheap, just what I had lying around until I can diy some better ones. I don't think it's a power cable issue because when i have no music running and crank the volume up, any kind of moving of windows or apps in win7 x64 causes more interference. I believe nothing else is being powered on the same cable run that connects to the essence stx, so I'm just trying to see if anyone has some input before I start redoing cable management. Any input would be great.