Can anyone explain cable risers?

They do nothing except seperate you from your money. It's called wealth transfer.
Cheers

The interaction that occurs is when something like a synthetic carpet has cables laying on them. The synthetic carpets properties are similar to those used in cable jackets and thus, compete with and interfere with those fields mentioned that travel with the cables signal. They simply smear the signal.

Yes, they can be measured so it stands to reason that if something is nearby, let alone parallel with and touchung a cable, can interact with it, then it can mess with it.

To what extent is debatable but if you have synthetic carpets, then go the extra mile to get them away from the carpet but you need not pay through the nose to do so.

I'm lucky in that my Mapleshade Double Helix speaker cables are so taut that they are easily suspended with nothing more than themselves and whatever nearby is handy.

If you have wool carpets or wood flooring, I wouldn't give it any consideration.

All the best,
Nonoise

""They do nothing except seperate you from your money. It's called wealth transfer""

Funny MY cable risers are empty toilet paper rolls.
Cut in half, then a "V" on both sides. Work great.
They cost me nothing. Since they are trash once the paper is used. And i actually am recycling them.
For the hoity toity, they can cut up paper towel rolls and cover then with white paper to look really fancy.. Though that would cost money for a few sheets of paper and some glue or tape.

"Funny MY cable risers are empty toilet paper rolls."

Elizabeth, you are a Paragon of practicality. You can even make nonsense sound sensible.
Cheers

"You can bet your bottom dollar that NONE of the various recording/mixing/mastering facilities are suspending their cables during the making of a recording."

I like that answer. All the recording studios I've worked in had the cables bundled together running across the floor or up inside a drop-ceiling. (We did keep power cables away from audio).
But I would agree with the theory to keep cables off the carpet.