Where to put the air compressor?

1MeanA said
A 2x4 enclosure with Roxul Sound insulation will knock the noise level down 10db which is a lot. Back in the day we put out shop compressor up on an open mezzanine without an enclosure. That was a big mistake.
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If I would put it in the mezzanine, it would definitely be in an insulated enclosure. Was the vibration an issue up there?