Carpet as Covering for Acoustic Panel

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DKane

Carpet as Covering for Acoustic Panel
« on: 21 Mar 2011, 03:17 pm »
Hello Forum Members,

First time poster / Long time lurker on the site - been soaking up your collective wisdom & experience (thanks), :D - but now I've got a specific question I'd like to pose for both the experts (Bob, Ethan, etc.), and anyone else who may have employed this technique.  I've got a situation, a horrible boundary problem, that cries out for attention.  I'm going to build a panel myself simply because the size requirement is anything but standard, and what I'd like to know is if using a nice decorative carpet as a covering, rather than the typical acoustic covering, would pose a problem in this case? 

So, what is "this case"?  My right/front speaker is next to a short wall, a little more than a foot away.  The wall has an access door to my A/C intake.  I'm going to build a panel that covers the entire door (and then some), about 3 ft wide and 5 ft high.  My plan was to use 2 inch rockwool or 703 fiberglass as the acoustic material.  It just so happens that I've got a nice carpet that would look great as a wall hanging in it's own right, so I thought I might use it to cover my panel.  I understand that carpet is not as acoustically transparent, at least not to higher frequencies, as other fabrics would be - but I'm not sure if that's an issue in this situation.  Please see attached pics. As the front of my speaker is about even with the extent of the wall, my thinking is that this wall represents more of a low frequency enforcement problem rather than a higher frequency reflection point problem - and if that's true, would using carpet as a cover do any harm?  Might it even be a "good" thing in the low frequency spectrum?

P.S.  I know I need panels in other areas as well - this particular panel will be the beginning, not the end!

Thanks everybody...




 

bpape

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Re: Carpet as Covering for Acoustic Panel
« Reply #1 on: 21 Mar 2011, 03:23 pm »
In that position what you're really looking for is boundary control which is in the mids down.  The carpet will work fine as long as it's covering something thick enough to do the job. 

Bryan

DKane

Re: Carpet as Covering for Acoustic Panel
« Reply #2 on: 21 Mar 2011, 03:45 pm »
Thank you Bryan - much appreciated!  I was hoping that would be the case.  I know I need more (low frequency absorbtion) than any single two inch thick panel can possibly provide, but I just wanted to make sure that using carpet as a cover on this panel wouldn't be "undoing" any of the good that the acoustic material was doing in the first place.  That particular wall simply won't allow for the use of anything thicker, otherwise I'd go for two layers of the 2 inch rockwool...  Thanks again.

Correction:  in my original post I referenced "Bob".  That's a mistake, I mean't "Rob", as in Babcock.  Sorry Rob.

bpape

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Re: Carpet as Covering for Acoustic Panel
« Reply #3 on: 21 Mar 2011, 04:54 pm »
As long as the carpet has enough high frequency absorption of it's own to offset any density issues, you're good to go.

Rob Babcock

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Re: Carpet as Covering for Acoustic Panel
« Reply #4 on: 22 Mar 2011, 02:36 am »
I'm hardly an expert, although I have stayed at a Holiday Inn! :lol: