A quiet compressor?

I would recommend that you somehow switch from an oil-less unit to a lubricated piston model. Those tiny little pistons gotta scream to move any air. The belt driven units aren't exactly quiet either but are much better than an oilless. As suggested a used model could be a good option for a belt driven, lubricated model. A friend just got a 60 gallon 240V Husky two stage off Craigslist for $300. It has a quite a bit of paint overspray on it but otherwise looks to be in excellent shape. Deals are out there.....