HELP PLEASE Sound Proofing Dust Collector & Compressor Noise

The noise from the dust collector seems to come mostly from the outlet. Once I installed the big filters, it quieted down quite a bit, although it still makes it kind of noisy in the shop. It can't be heard outside through my insulated walls.

The sound is a low-frequency whoosh, really not unpleasant. (You really should have hearing protection on anyways because of the woodworking machinery.)

There might be a few things to consider regarding a little room. I was planning on the same thing, but reconsidered and left it out. First, the motor needs to breathe. It gets hot, so air needs to circulate around it for cooling.

Second, you have to allow for the system exhaust to go somewhere- either outside or back into the shop. I opted for back into the shop, because I didn't want to deal with 1200CFM of air makeup, especially if I have spent money on air conditioning! There is virtually no breeze coming back from the filters, so I don't have stuff blowing around, like dust from the outside.

Third, the sight of dust and chips whirling about in the clear cyclone is really cool!

I think if I decided to attenuate the sound, I would buy Sonex panels and install them on the walls adjacent to the cyclone and filters. Also, there are a lot of tips in the Clearvue forums about mufflers and filter enclosures.

Without knowing your setup its a little hard to make specific recommendations. One good way is to build a double wall enclosure made of heavy dead materials on both sides that aren't touching each other, or touching each other minimally. There is a neat trick in house construction where you place the 2×4 studs every 8" instead of 16" and then offset every other stud an inch or so the first stud is supporting the inside wall and the next stud is supporting the outside wall etc. The acoustic path of least resistance in this modified wall is from the equipment to the sheet rock to the void space to the other layer of sheet rock to the new room every time you go from high dense material to low density a lot of energy is lost. In normal construction the stud bridges the void space. which has a much lower resistance. Heavy layers are preferred in this scenario because they absorb a lot of energy in themselves. Note you don't want anything that will naturally resonate at an audible frequency so stay away from metals.

Without adding a new / second wall anything soft will absorb a lot of the noise: heavy fabric, old mattresses, blankets, egg crate foam, cardboard boxes stuffed with peanuts, or more cardboard, deep pile carpet on the walls, They insulated the home recording studio in Hustle and Flow with cardboard and foam egg crates (the clear plastic won't work as well).