Being newish to HiFi I research every claim that I am interested in. The latest was about the quantum diffusor. The claim on this one is one of the funniest examples of "snake oil" you will find. A knowledgeable and trustworthy gent explained to me that the Schumann resonance is simply the natural resonance frequency of electromagnetic waves which circle the earth-- if you compute the wavelength vs path length, you come up with around 8Hz which is what this box claimed to emit electromagnetic waves to nullify acoustic feedback! This magic box, of not inconsiderable expense, couldn't acoustically nullify itself if it tried.
So there are valid examples of "snake oil" that the inexperienced could be lured in to purchasing, but having said that, look up the subject here and there will be pages of posts howling one way or another.
Find someone you can trust and ask.