Does raising speaker cables off the floor really make a big difference?

Shagadelic, Baby! Yeah! 🤗

No.

Why was this thread not started in the " CABLES " section ?  Lots of posts in 10 days here about such a significant, audible improvement to be had, by doing this. I find, isolating all of my cables, mechanically away from floors and walls, and eliminate all negative, electrical, static, mechanical, and audible influences, the cables do not exist. @geoffkait ....I follow you completely, on the subject.

I have a suggestion. Does the insulator on a speaker cable store and re-release an electric field capable of doing something to the sound? A way to find out is connect one cable pair to an amplifier but not to a speaker. If you use tube amplifiers, especially SET, you won't hurt the amplifier and it should be safe with much solid state. Connect another cable pair to a speaker, the more sensitive the speaker the better' but not to an amplifier. Tape the two cables against each other so the amplifier voltage in one cable pair is able to store the electric energy in the dipole molecules in the cables connected to the speaker. Turn up the music on the amplifier to the one set of cables and place your ear against the speaker with its disconnected cable. I do not think you will be able to hear the micro-volt effect of molecular dipoles tilting and returning to normal. That is one test where there is no danger of any placebo effect in a listening test. 

No theres no difference .