Ronaudio, wow that is very interesting to see. As you may know Pacific Microsonics Inc developed the HDCD audio technology. Then in Sept 2000, Microsoft acquired them. In light of this, I would venture to say that these cables you have were produced prior to 2000. So you have cables that are at least a dozen years old. How they're designed I don't know but obviously PMI had the HDCD format in mind. These probably work best with the HDCD signal path as compared to other cables available at that time. Best guess. Have you searched for any data or info on the internet?
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