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.
Headache and Sensitive to noise. WebMD Symptom Checker helps you find the most common medical conditions indicated by the symptoms headache and sensitive to noise including Migraine headache (adult), Tension headache, and Aseptic meningitis (adult). There are 72 conditions associated with headache and sensitive to noise.