From what I read these fans get up to 37db which is still relatively quiet. The db scale isn't linear.
Check it out on this scale:
http://www.industrialnoisecontrol.com/comparative-noise-examples.htm
If you don't like those particular fans and want quieter fans, there are fans that produce 20db or less.
If you're going to be blunt, so will I.
These aren't the most quiet fans on the market. The ML drive reduces the bearing noise to almost nonexistent, not the fans slapping the air.
Look up quiet fans, or deal with the sound they make. You saw the specs and you could watch videos on line.
If you don't want to buy new fans, turn them down.
No one here can "make" the fans more quiet for you. Don't come here and be rude. They produce as...