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.
Make sure that is quiet in the bedroom. Noise can disturb your sleep and if it continues, you may have a sleepless night. A white noise machine will cover all the unwanted sounds and replace them with what they call a âsmooth sound of rushing airâ. Here you will find some models and reviews to help you better decide.