I did not pen this but I believe it is about the best written on this topic.
There is a whole scientific process for developing a method to measure a cause, then a process for developing a device to accurately calculate the degree of the cause which includes calibrating the device to a certain standard to ensure one is receiving an accurate measurement. Then the whole process should approved by an independent peer review.
So, let us apply this principle to elevating cables off the floor. First we need to ask what type of devices are being used to measure the cause and effect. What is the method of testing, and has that method faced and been confirmed by a peer review. I have not seen or heard of any such research, has anyone else?
Next, let us apply some common logic. If there is an effect, the cause must be coming from the floor. One would not lift their cables into the air, exposing the cables to more air, if the cause was airborne.
What is in the flooring? Something in the varnish applied to wood floors? Perhaps static electricity form the carpet? Electric cables under the flooring? And what if you have a concrete floor? Could it be the steel reinforcing bar in the concrete? Is it the vibration from the speakers? If so, would they not still be effected by by airborne vibrations? They all claim an effect, but where is there scientific proof of the cause?
However, if one has ultra expensive cables named after snakes, cats, mountains, or Norse gods, designed to protect the flow of current from all known effects, and hand braided by child labor, well... those cables will never live up to their potential unless elevated.
Now examine the materials used for these lifters. I have seen wood, glass, ceramics, secret metal alloys and compound polymers, and even little disks with embedded tuning forks! I once saw a system with special inert screw eyes for the ceiling, with a special monofilament that dropped to a wooden clip for holding the cables off the floor. The simple device even had a patent pending, someone actually applied for a patent for a piece of string attached to a clothes pin! Of course, all were designed from extensive research, and each will claim in aggressive, enterprising language that all their competitors are bogus, only they make the proper product.
More nonsense: How do the manufacturers know exactly what height to elevate the cords, should it be 3, 4, 8, or 12 inches? At what height will the perceived effect be neutralized?
I am waiting for the day when someone sitting on a large supply of gas tanks decides to market oxygen to audiophiles. We should all know that only in an oxygen enriched room will all the distortion effects be neutralized.
I recall reading a product brochure many years ago by the audio equipment manufacturer Threshold. They claimed their circuits corrected for distortion at 100kHz, because distortion there can trickle down and magnify distortion at 30kHz. All well and good, but I doubt any human alive could hear the results