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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There was one guy who had a magazine in his home for an interview.
He told the guys that if a component or unit had been forced to play rock or hard rock, it was forever damaged. He could ofcourse hear this so he was deeply afraid when he bought used stuff. He also took apart stuff and exchanged all plastic parts. That included internal wire!!
Zero plastic was allowed in any of his cables or components.
This is no hoax, but question remains, was he sane?
The biggest hoax (better to call it a myth) is very common these days and relates to the position that all that determines the good sound is related to "measurements." 
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