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.
Loud noises cause hearing loss by damaging the stereocilia: tiny hairs that sit on the top of hair cells in the inner ear. Noise makes them vibrate â changing the voltage in the hair cells â which then sends chemical messages through nerves to the brain. Battering your stereocilia will damage your hearing.