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Dissapointed in my gentle typhoon

post #1 of 8
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I bought an AP-14 because of the immense amount of praise for gentle typhoons being thrown around. I found that at the default speed of 1450rpm the fan made a very tonal sounding whine. It wasn't loud enough for me to think that the fan was defective but definitely loud enough to annoy me. I played around with the fan speed and found that the whine didn't go away until it got down to ~400rpm, but at that speed pretty much any fan is going to be awfully quiet. I wonder if I got a bad copy or if the latest batch of these fans might have a slightly different manufacturing formula than previous batches that have earned such high praise. Not trying to bash gentle typhoons, just wondering if there has been any change lately in their quality that anyone else can comment on that may have bought more than one of them over a span of time.
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post #2 of 8
My AP-15's are almost dead quiet, it definitely sounds like a defective fan to me.
post #3 of 8
This resonance tone is audible with all GTs, probably due to the double ball bearings these fans use. I have three AP-13s and all of them exhibit this tonal sound at certain RPMs, which is why I ultimately exchanged them for Nexus fans.

The resonance should however be present only at certain RPM values, see ex. this review, you can clearly hear the tonal noise come and go as the voltage is increased. You might be able to find some RPM values where the fan does not exhibit this tone, by fine-tuning the voltage. IIRC, for my AP-13s the sweet spots were at ~560 and ~780 RPM, where only the air flow and the (very quiet) baseline hissing noise of the bearing was audible. This is however solely based on my experience at low RPMs. Judging from that youtube review, it might be a bit more fiddly (or even impossible) to get rid of that resonance tone at higher RPMs.

Oh and how anyone can call a 1850RPM fan dead quiet is beyond me tongue.gif
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post #4 of 8
Thread Starter 
Quote:
Originally Posted by phal View Post

This resonance tone is audible with all GTs, probably due to the double ball bearings these fans use. I have three AP-13s and all of them exhibit this tonal sound at certain RPMs, which is why I ultimately exchanged them for Nexus fans.
The resonance should however be present only at certain RPM values, see ex. this review, you can clearly hear the tonal noise come and go as the voltage is increased. You might be able to find some RPM values where the fan does not exhibit this tone, by fine-tuning the voltage. IIRC, for my AP-13s the sweet spots were at ~560 and ~780 RPM, where only the air flow and the (very quiet) baseline hissing noise of the bearing was audible. This is however solely based on my experience at low RPMs. Judging from that youtube review, it might be a bit more fiddly (or even impossible) to get rid of that resonance tone at higher RPMs.
Oh and how anyone can call a 1850RPM fan dead quiet is beyond me tongue.gif

Thanks, solid info. I tried hooking up the AP-14 to a silverstone fan controller looking for sweet spots but I think that even at the fan controller's lowest voltage the fan was still spinning too fast to get to any quiet sweet spots. I think I'll just let my mobo control the fan speed but set the manual rpm/degree to be the lowest setting so that it idles at around 400rpm.
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post #5 of 8
i agree, i'm not a fan of gt's for the same reason. if you want no bearing noise you need to look at quality sleeve bearing fans...
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post #6 of 8
I call it a monday unit.
My ap-14 doesn't make any extra noises, nor does my ap-15's.

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post #7 of 8

You might actually have gotten an imperfect GT. They are cheaper after all than comparable San Aces. San Aces are individually balanced, so they cost more. GT's, nice as they are, are mass-produced. And they're not magic.

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post #8 of 8
Try out some Noiseblockers, you won't be disappointed.
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