Would love to give you an answer but I don't actually notice it. I'm sure it does it, but I'm almost never stringing in a completely quiet room. Shop at home has a mini split for AC/Heat as it's an addition to the house so the unit is fairly loud when it's running. Also have a 6 year old that usually follows me when I go to string so he's bouncing around and watching tv or more recently playing video games since I set him up my old PS4. The only thing I really notice in regards to noise on stringing machines any more is when the beep is on for tension pulls. It's like nails on a chalk board. Otherwise, unless it's making what I consider an abnormal sound, I don't even notice.