Well, I'd guess that the good news for a question like this is that there should be a measurable and repeatable test for this phenomenon. And, it doesn't even have to be a double blind test, although that sure would be an interesting (well, at least to me) addition.
If your carpet's acting as a dielectric with enough effect for you to hear a difference, then any actual effect would be a difference in the electrical signal being received at your speaker. That is testable. I don't happen to have the issue, and no, I'm not running out to buy carpeting or even a variety of sufficiently long carpet runner samples to perform such a test. But I'm sure that any number of folks with the appropriate technical background and available equipment could nail this one and/or at least help quantify the impact for us all.
From what I remember of any recording studio I've ever been in (no, not that many ;~) I can never remember seeing little cable risers anywhere. Wire strewn all over the place, and lots of carpet too, but no little cable risers. They probably figured that their shielded & balanced connections more than covered any such effect.
If your carpet's acting as a dielectric with enough effect for you to hear a difference, then any actual effect would be a difference in the electrical signal being received at your speaker. That is testable. I don't happen to have the issue, and no, I'm not running out to buy carpeting or even a variety of sufficiently long carpet runner samples to perform such a test. But I'm sure that any number of folks with the appropriate technical background and available equipment could nail this one and/or at least help quantify the impact for us all.
From what I remember of any recording studio I've ever been in (no, not that many ;~) I can never remember seeing little cable risers anywhere. Wire strewn all over the place, and lots of carpet too, but no little cable risers. They probably figured that their shielded & balanced connections more than covered any such effect.