how to keep air compressor quite?

i live in a neighborhood where my neighbors are 4 feet away how do i keep compressor quite?

What kind of compressor is it?

Typically the loudest part of the compressor is the intake. if you can vent that somewhere it is out of ear shot that's a good start. After that you could build a box of ply wood and insulate it with rigid or glass wool insulation.

We could use more info. 1 stage? 2 stage? What compressor is it. I had an old craftsman single stage screamer and when it died I bought a 2 stage pro model. What a difference!! At least 40 or 50 percent quieter. Eventually I will get a good one. For now this is sufficient. My neighbors aren't 4 feet away but we are close enough that I will try and keep it quiet also. Besides I don't want the noise inside the garage either. I would like to be able to hear the radio when I am working in there.

i got an ir 7.5 horse 60 gallon, two stage

Foot pads under the feet of the unit ,
Flex line from the compressor to any hard lines ,
Air intake silencer ,

Box in the compressor in a small room that is sound insulated and / or
make sure the room it is in is insulated and doors and windows are closed to the outside .