I've got this little niggle on my main which is quite annoying: when the case fan is spinning within a certain RPM range the PC emits a distinct 'whooooo' noise. It is quite loud too! ...more than the rest of the PC anyway. Bump the voltage a little, or turn it a bit down, and it's gone. The funny part is, also accelerating the CPU fan makes it disappear.
Is this cavity resonance, and how can I get rid of it without messing with the fan controller?
Solo resonating?
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Devonavar
Hmmm... how do you get rid of it? I think you've already got the answer
Just do it and leave it there, what's the problem?
Other than that, I can see you've already suspended the fans. Maybe changing them to smoother running units would fix the problem. Your solution is cheaper though
Bump the voltage a little, or turn it a bit down, and it's gone.
Just do it and leave it there, what's the problem?
Other than that, I can see you've already suspended the fans. Maybe changing them to smoother running units would fix the problem. Your solution is cheaper though
-
- Posts: 152
- Joined: Tue Oct 20, 2009 12:06 am
- Location: Cape Cod
I wonder if adding some dense foam blocks to the empty 5 1/4 bays would help? I have a solo, have not heard any noise yet, but I plan on adding blocks anyways. They are available at endpcnoise.com and some other places.
I also took out the tri speed fan and mounted a Noctua silent fan with rubber grommets. SWEET SILENCE
Dave
I also took out the tri speed fan and mounted a Noctua silent fan with rubber grommets. SWEET SILENCE
Dave
-
- Posts: 414
- Joined: Wed Jan 17, 2007 7:55 am
- Location: EU
That could something worth trying. I dug up a formula from this page:capecodbackup wrote:I wonder if adding some dense foam blocks to the empty 5 1/4 bays would help?
http://hyperphysics.phy-astr.gsu.edu/HB ... ty.html#c3
And it suggests that the blocks -by reducing the volume- should drive the resonant frequency up. Not sure if that would be enough or whether the dampening effect can affect resonance..?
Due to the nature of the sound I don't think it's a mechanical vibration through the case, the noise is just too smooth.
BTW the fan is an S-Flex and is very quiet up until 60% voltage, but the rubber grommets are not that great. OTOH two of the holes on the Solo are just too big for other rubber grommets to fit snugly.
The fan is thermally controlled so to avoid it sitting in that RPM range would require tweaking the transfer curve.KadazanPL wrote:Just do it and leave it there, what's the problem?
-
- Posts: 152
- Joined: Tue Oct 20, 2009 12:06 am
- Location: Cape Cod