Is it normal for fans mounted behind a dust filter and pushing air through a radito to make a tonal noises at certain speeds?

[Bloazzt]

So I've tried the Noiseblocker eloops and they also made a tonal noise so I returned them. Thinking it was just their weird shape/6 blades I purchased the Noiseblocker multi frame fans (5 blades normal shape) recently but they make the exact same noise. Not sure if it's resonance or what but it only occurs at certain speeds. The fan speed is controlled by asus fan xpert 3. So I'm currently looking at getting the vardar or nf-f12. How can I know if these won't make the same noise at certain speeds? Might it just be a problem with Noiseblocker? Thanks,

 

[chupababa]

I had an issue with noisy fans on my old Rosewill Challenger and adjusting the tightness of the screws got rid of some buzzing. I'd suggest try tightening or loosening the screws and see if it does anything

 

[Bloazzt]

I had an issue with noisy fans on my old Rosewill Challenger and adjusting the tightness of the screws got rid of some buzzing. I'd suggest try tightening or loosening the screws and see if it does anything

I don't think that's the issue as both are rubber mounted. The noise itself isn't so "loud" but a weird tonal noise which makes it really noticeable compared to normal fan noise. Without the tonal noise, the fans are almost dead silent in my case. I just really wanna know if this is something people have experienced with other fans or is a specifically a Noiseblocker/certain types of fans problem.

 

[mcnumpty23]

i put rubber washers between my radiator and the metal of the case when mounting them

have had resonance/vibration noise in the past before i did that

could always test with the rad out of the case with the fans on it

if it still makes the noise then guess yes its the fans

 

[Sedivy]

Yes I get the noise with my two air pressure fans pulling the air in through the filter at the front of the case. But I've read about this and realized it's bound to happen at certain rpm no matter which fan you get, though some have better pitch and are a little quieter compared to others. Overclockers have good comparisons on this though not necessarily with latest fans. You can also often find video review on youtube and they let you hear what the fans will sound like at high rpm.

The most effective thing in my case was to set different fan profiles for each fan, and for different situations. Like for most day to day operations I have one fan curve that keeps all chassis/gpu/cpu fans relatively low and therefore very quiet and another to ramp them all up when gaming. The trick was not to have any one fan at overly high rpm while others are mid or low. With both front fans at say around 700-900 rpm and same for cpu and gpu fans, you get decent temperature but never dip any fan into annoying buzzing territory. You can go up to 1000 and still be ok. Over that and you start going into annoying noise but if your temps are high, it's worth it.