My air compressor is quiet! It consists of a (old) Speedaire tank, a (very old) 3/4HP or so Westinghouse motor, and a (old)"Made in the United States of America" compressor, which was part of a refridgeration unit back in the day. For the air inlet it's a ~2" steel pipe that sticks out about 8" and has a flat square air filter; sort of like what's on a B&S engine. There's a Square D box on it that has no controls, but I think that is some sort of inverter or transformer. Everything on it was made and assembled in the US.
It pumps up rather quickly with a "put put put put put put" sound, not a BRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR RRRRRRRRRRRRRRRRRRRRRRRR sound that the oil-free compressors make.
The only bad thing is it only pumps to 80 PSI. And it's heavy as hell, but it has wheels. I'd like to get about 120PSI out of it, how'd ya do it?