My quietest is my Hoover Dimension 1000 canister. Loudest in my collection which I don't really consider too loud as it's tone is so pleasant: Hoover Celebrity II Elite.
Now I do currently have in the house waiting to sell a Dirt Devil Vision Turbo- very loud and louder Eureka Powerline! The Eureka is very very loud I would say with heavy vibration in the handle as well. I found at a thrift shop and cleaned it up for selling. It runs good, with no bearing issues that I can tell and brush roll is like new. It's just very loud.
Surprising the compact Kenmore Magic Blue canister is very very loud as well!! I only purchased it to resell and I was glad when it was sold. Very powerful unit but quite loud, I've never heard a canister vacuum so loud and it only had a turbine head, not an electric power head.
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