Biggest audio hoaxes


Often when people discuss audio, they talk about "snake oil" or "hoaxes."

It's pretty typical to use the term hoax as a tactic against another who disagrees with one, or holds an unusual opinion or vouches for something which has not been verified. That's not what I mean by a "hoax." 

By "hoax" I mean an audio product or claim which has been pretty definitively disproved. Maybe not to everyone's satisfaction, but to common consensus.

So -- with that definition of hoax in mind, what are some of the biggest audiophile hoaxes you've heard of?
128x128hilde45
@bdp24 Are the Townshend products very helpful even for those of us with concrete floors covered with a short rug? My floor feels very stable, and while I respect the idea of vibration control enough to try it, I wonder if my rig is very susceptible to the kinds of vibrations these products help to mitigate?
@hilde45 Hopefully not flogging a dead horse but for $32, you can try the Nobsound springs to get an idea of how it sounds. 
A lot of people walk the walk. Most just don’t continually boast about it unless someone asks or they have something to sell which is normal.