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What do they mean when cutting out the fan grill reduces db?

S

simms

Diamond Member
20 dBa + 21 dBa + 20 dBa = 62dBa? 21dBa? How do decibels add up?
Is it just the loudest one that overpowers all the quieter ones, meaning it's 21 dBa?
What if you run 5 20dB fans at the same time compared to 1 20dB fan? Same noise or 5 fans make more noise?

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Right now my NB and my GPU are passively cooled, the CPU has a 20dB 92mm and the PSU and out take has 21dB 80mm's.

So, can I make it quieter without doing volt mods? How are these insulators? Buy or no good?
http://mirror.memoryexpress.net/ProductDetail.php?DisplayProductID=3595
It's $7 for 2.

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Is there really a difference in noise having a OEM case grill compared to cutting it out and putting another grill 2mm away from the fan?

Simon
 
Removing the fan grill completely will result in improved airflow due to less resistance from the air hitting the metal grill... and less resistance = less noise... However, adding a different fan grill will again impede airflow... If you don't care about having a fingerguard for your fans, the grills are unnecessary.
 
That won't reduce fan noise. Some people (including me) cut out the fan grills because it creates turbulences in the air flowing out (blow air through your spread fingers and you'll know what I mean). If you put another fan grill on the fan again you might as well leave the old ones in. Your fan grill looks quite good though so you probably won't really notice a difference if you cut them.
 
21 + 21 = 24
21 + 21 + 21 + 21 = 27
each doubling in the amount of sources results in a rise of 3dB. I know, I suck at explaining.
 
People who cut out fan grills usually do so because their ones are restricting, like Lian Li grills. Cutting your ones out and adding another grill shouldn't make a difference. Don't get that Vantec thing, they don't decouple all that well because the screws still connect the fan and the case. Rather use rubber grommets instead of screws.
Take a look at silentpcreview.com, all your questions should be answered there.
 
it can reduce noise. db measurements by fan manufacturerers are in free air situation after all.

i guess if ur ghetto u can use blue tac or something to mount fans😉

and yea many grills are just pathetic.
 
I can't find these "rubber grommets" anywhere.. my hardware store and pricewatch don't carry em. Anyone know of a store that sells good thumbscrews etc?
 
Depending on several factors you can get a whistling noise from drawing air through the numerous small holes that constitute a "fan grille" on many of the cheap cases. The old Enlight cases (e.g. the 7227) had a very low restriction grille, it was convex and had very little metal remaining. But not any more - the tool and die to do it are too expensive I guess. So just cut 'em out!!!
.bh.
 
Originally posted by: Nickel020
That won't reduce fan noise. Some people (including me) cut out the fan grills because it creates turbulences in the air flowing out (blow air through your spread fingers and you'll know what I mean). If you put another fan grill on the fan again you might as well leave the old ones in. Your fan grill looks quite good though so you probably won't really notice a difference if you cut them.
Click to expand...

The turbulence of the air rushing through creates a loud "wind" sound when using some of those higher-RPM fans, so reducing turbulence usually helps with the overall noise created by the fan (not the fan noise itself, but the sound of the air moving through).
 
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