I have a dual 120mm radiator on my watercooling system. The fans are meant to be 'ultra quiet' and i rn them at 6v each (they stop sometimes at 5v).
When on their own i really cant hear them spinning unless i get very close yet when they are sucking air through the radiator they make quite a lot more noise, not loads, but more than id like.
Basically i was wondering; if i built a shroud to offset the fans 40mm or so would reduce this reduce the noise much? Also would the performance change noticeably?
Thanks