Does this eggcrate look OK for damping cabs? - AVS | Home Theater Discussions And Reviews
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post #1 of 9 Old 02-06-2015, 04:42 PM - Thread Starter
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Does this eggcrate look OK for damping cabs?

I have just enough of this stuff on-hand to line the three 88 Specials I'm building. I've had it for a few years. It came with a kit for a bass cab (electric bass) that I built, but I didn't use it b/c it just felt too dense to me. I know you can't tell what this feels like, but it doesn't squish as easily as a foam mattress topper does. Does this stuff look OK to you?



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post #2 of 9 Old 02-06-2015, 05:20 PM
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Dense = good. If its open cell you can use it .
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post #3 of 9 Old 02-06-2015, 05:44 PM
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Not nearly as effective as insulation, but better than nothing.

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post #4 of 9 Old 02-06-2015, 08:17 PM - Thread Starter
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Hmm. I may just buy another mattress topper from Walmart and use that. It's definitely "open cell foam" of some kind, but it doesn't seem to have that "breathing ability". I would worry it would just take up airspace like a solid block of wood vs. providing any damping effect.
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post #5 of 9 Old 02-06-2015, 08:20 PM
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Quote:
Originally Posted by michaelddd View Post
Hmm. I may just buy another mattress topper from Walmart and use that. It's definitely "open cell foam" of some kind, but it doesn't seem to have that "breathing ability". I would worry it would just take up airspace like a solid block of wood vs. providing any damping effect.
Can you squish it and have it return to shape? If so it's open cell and is fine.

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post #6 of 9 Old 02-06-2015, 08:47 PM - Thread Starter
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Originally Posted by Bill Fitzmaurice View Post
Can you squish it and have it return to shape? If so it's open cell and is fine.
Hi Bill. Yes; when I squish it, it immediately springs back into shape. Thanks for the advice.
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post #7 of 9 Old Yesterday, 08:20 PM
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Quote:
Originally Posted by Bill Fitzmaurice View Post
Can you squish it and have it return to shape? If so it's open cell and is fine.
Will this type of open cell material (mattress topper, etc.) work for dampening the room as well? This is a lot cheaper option compared to acoustic foam...
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Will this type of open cell material (mattress topper, etc.) work for dampening the room as well? This is a lot cheaper option compared to acoustic foam...
The main difference between acoustic foam and plain open cell foam is the size of the pores and the convolutions. They function pretty much the same. Convolutions are mainly cosmetic, emulating the old days when egg crate treatments really used egg crates, not for damping so much as for diffusion. But as diffusion requires a surface that's reflective convoluted foam does very little diffusing, as it also does very little reflecting.

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post #9 of 9 Unread Today, 08:04 AM
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I've recently learned to hate the convolutions off egg crate foam. They trap saw dust and make it extra difficult to vacuum out. The flat surface foam is easier to manage IMO.
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