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.
1 hyperresonance, a loud, booming sound, is usually heard over a hyperinflated lung, as in patients with emphysema. 2  dullness, a soft, high-pitched, thudlike sound, can generally be heard over dense organs, such as the liver. 3  flatness, a soft-high-pitched sound, is generally heard over bones, muscles, and tumors.