best acoustic dampening material? - Page 2 - Overclock.net

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post #11 of 29 Old 04-08-2008, 10:51 PM
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Looks like it's dimpled and not quite egg crate foam


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post #12 of 29 Old 04-09-2008, 08:58 AM
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Quote:
Originally Posted by bentrinh View Post
Not to question the "engineered" stuff, but isn't it just egg crate foam?
The better speaker stuff have a thick foam backing which helps reduce vibrations. The foam on it helps absorbs higher frequencies. The thicker the foam, the more frequencies it can absorb. (The foam must be thicker than the wavelength).

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post #13 of 29 Old 04-09-2008, 09:44 AM
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Quote:
Originally Posted by DuckieHo View Post
The better speaker stuff have a thick foam backing which helps reduce vibrations. The foam on it helps absorbs higher frequencies. The thicker the foam, the more frequencies it can absorb. (The foam must be thicker than the wavelength).
The material from Parts Express has three separate layers that each perform a different function. The thick foam layer absorbs high frequencies, the thicker it is, the lower the frequency it can absorb (righto, DuckieHo...). The dense, vinyl barrier prevents sound from reaching the metal panel and the thin foam barrier isolates the (vibrating) barrier material from the metal panel. The combination of these three functions is much better than any one.

The other technique to use is constrained layer damping. To the existing panel you add another metal layer with semi-solid goo in between. You can buy it or make it. If you fabricate your own metal damping panels and glue them to the case panels with polyurethane adhesive (or "Liquid Nails") from the hardware store, you can save some money. Otherwise, just buy it from one of the vendors in this thread. Don't bother with the plain vinyl damping sheets, the constrained layer (metal/goo/metal) is the best by a long shot. BTW, the ideal thickness for the extra metal layer is the same thickness of the metal panel you are damping.

The combination of these is in my CM690 and my Antec Sonata. My Sonata is dead quiet, the wife's CoolerMaster has a side fan and a lot of open areas still, so it is not completely silent, but it's much quieter than stock. She thought hers was quiet, until I built mine.

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post #14 of 29 Old 04-09-2008, 10:34 AM
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...
This begs to be a how-to!

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post #15 of 29 Old 04-09-2008, 01:49 PM - Thread Starter
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any links or pics of that metal dampening?

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post #16 of 29 Old 04-09-2008, 02:05 PM
 
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IMO the best sound proofing stuff is el-cheapo mousemats, you can probably get like 4/$1 and they are pretty much the same stuff, if you want thicker stuff, just double them etc. I think thats better than paying really high prices for this stuff

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post #17 of 29 Old 04-09-2008, 03:50 PM
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Quote:
Originally Posted by bashy View Post
any links or pics of that metal dampening?
Here's the industrial info. I've used their products in my designs, and they are quite good but pricey and hard to source.

http://www.soundcoat.com/soundcoatdamping.pdf

Here's the stuff I used on my PC cases, it's fine for home use and easy to get.

http://www.partsexpress.com/pe/showd...number=268-286

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post #18 of 29 Old 04-09-2008, 05:53 PM
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Quote:
Originally Posted by FerdinandII View Post
The combination of these is in my CM690 and my Antec Sonata. My Sonata is dead quiet, the wife's CoolerMaster has a side fan and a lot of open areas still, so it is not completely silent, but it's much quieter than stock. She thought hers was quiet, until I built mine.
What kind of temperature change did the sonata see once you silenced it?

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post #19 of 29 Old 04-10-2008, 09:18 AM
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Quote:
Originally Posted by Darin View Post
What kind of temperature change did the sonata see once you silenced it?
I put in all new components at the same time, so I don't really know.

However.....I only see 1-2 degrees C difference when I have the side cover installed, v. when I have it removed. I'm only using the two stock 120mm fan locations (front-in and back-out) and temps are fine. I'm using decent CPU and GPU coolers and haven't really overclocked it yet, but the temps are fine. I'll run some tests tonight and post some numbers in my sig.

Regards, B.

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post #20 of 29 Old 04-10-2008, 09:27 PM
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Is it pointless to try to mount these behind the mobo? Seems like it would help less, but nonetheless significantly.
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