I go 4 fingers down from the collar on the front, and just under the front collar impression on the backside of the shirt. everyones fingers are different so I measured mine and the 4 fingers measure 3.5. I also use my left hand to guage where to put left chest logos.
Grey noise then, has a sound frequency that, if translated to a light frequency, would roughly be the color grey. Grey noise is a random sound that is distinguishable from other types of sound because it sounds the same, to the human ear, at all frequencies.
White noise is a nondescript background hum, kind of like the noise of a fan or of someone saying âShhhh!â continuously. Listening to white noise may turn out to be better than listening to intermittent speech if it successfully drowns out the speech, but that doesnât mean itâs ideal.