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[the_bertrum]

people with 'golden ears' could hear a bad module that tested perfectly

So how was the module declared "bad" if they passed all other tests?

Anyhow, yes it is the why and how of these claims that interest me. I accept that maybe harmonic from the ultrasound range could fall in the audible range and that can have effect, or maybe that we sense them through our arm hairs. Infrasound can certainly have detectable effects on people. All these things are measurable and testable and given the price of the equipment that is sold to access these esoteric frequencies, you'd think they'd do the research so shut people like me up