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

@khughes:  What does quality of recording have to do with the OP's post ?  Zero.  I'm guessing he already knows that nothing will save a crappy recording.  He's asking if this particular thing will improve a good recording.  So your comment is irrelevant and useless to him.
Perhaps you haven't paid attention to my prior posts to the OP--the tweak is so cheap you can try it and see if you hear anything--posters that say they've tried and don't hear anything--that's of use to the OP--posters that haven't tried anything and still diss--useless as you know what on a boar (or is that a bore?) or as Willie might put it:  "There's deceivers, and believers, and old in-betweeners
that seem to have no place to go..."  

Uh, oh, looks like we got some blowback from Joe Blow.

@khughes, oh I do.....👍

Hey, you eliminate one by one.  What you get?  Snake oil and believers.  

Damn, ain't getting easier.  Between Jekyll and Hide.  Close your eyes and pick one lols.  

"There was an immediate collapse in the soundstage when they were removed."

It must have collapsed all the way to the floor.