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?
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Audiophiles claiming they care about audio and are threatened by engineers because they see through the lies.
Insecure "audiophiles" who don't have the intelligence to become electrical engineers and don't understand the technology.

This from the “electrical engineer” who claims more tubes are needed to implement feedback in a vacuum tube amp. 😂🤣