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I see a few cyclone dust collectors with canister filters that advertize sound level ratings from around 70 db to 80 db. The reviews I read mostly state that none even come close, all are a lot louder when tested. Usually in the 90 db range.

Are the reviewers wrong or is there really a setup that is as quiet as it's rating?
 

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Just as the CFM ratings are usually wrong, so are the db ratings (IMHO). Most of the noise come from air movement, and while you can quiet that down with some engineering stuff it would probably be beyond the pricepoint most hobbyists would want to pay. Even if they are correct, it still may be quite a bit different than what you will experience in your own shop.
 

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I have a Laguna 2HP cyclone DC, and it is relatively quiet. I say "relatively" because if I start my table saw, then the DC, I can barely hear it start up. (Of course, you really want to start the DC first …)

When it is running by itself it is not unpleasantly loud, nor is it a high-pitched noise, like my DeWalt planer. It is closer to the sound pitch nad level of my Ridgid 6" jointer. The Laguna website claims 74dB, but I have not measured it. I can only say it is much quieter than I expected.
 

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I have not seen one that is below 90dbs.

See what they say when you tell them that you intend to send it back as defective if it is over the advertized dbs. haha

I put mine in a sound proof closet and I am very happy with it. Air moving is loud but air sound (hiss) does not bother me as much a machine sound.
 
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