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Message: <blockquote data-quote="Ryujin" data-source="post: 9719181" data-attributes="member: 27897">EVP is one of many things that "paranormal investigators" will truck out, with absolutely no factual basis to support it. When you get to the point of amplifying background noise to that extent, you're almost certainly going to pick up stray signals from other sources. Radios are just tuned amplifiers. Recording devices have amplifiers. The loudest electronic "noise" that you'll find is terrestrial broadcast signals. I'm guessing that no paranormal investigator has ever built a crystal radio or, if they have, they're conveniently forgetting the principles involved when they "receive" EVP.EDIT - Then there are the "magnetic field detectors", when there's nothing even anecdotal to suggest that ghosts have an effect on magnetic fields. It's a "They MUST!" sort of assumption.Another Edit - Regarding the creating of accidental crystal radios, pretty much everyone has heard the story of someone who could receive radio transmissions via their fillings. Lucille Ball helped root out a Japanese spy, during WWII, by hearing a secret radio broadcast via her fillings.[URL unfurl="true"]https://www.youtube.com/shorts/VL8N7pe4xVw[/URL]</blockquote>