Interesting.

The giveaway is that most of these manufacturers claim RFI reduction but none of them give any figures or details of tests whatsoever. In a competitive market, one would assume at least one manufacturer would work out the marketing advantage of publishing measured figures for the claimed reduction. The fact that they don't suggests RFI reduction claims should be treated with extreme suspicion, whether you like what these cables do or not. Plenty of people in this thread have claimed the cables have a positive effect reducing RFI, but it appears that's just an assumption from claims made by manufacturers, and not an established fact at all.

-- Ian