what kind of compressors are quieter(less decibels) the direct drive,belt driven,oilless,??
It is my experience that they are all pretty noisy. The main governing factor seems to be that the bigger the compressor, the more noise. Some compressors have scroll compressors that are quieter but they are high dollar units. My noise solution was to locate my compressor in a closet (with ventilation to the outside) and run a line into my shop. The closet walls are lined with fiberglass ductboard (soft side out). It's pretty quiet. I did the same with my shop vac. When I'm using the compressor away from the shop, I run a long air hose and place it away from where I am working.