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Yoda117
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Joined: 20 Dec 2006
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Location: Philadelphia, Pennsylvania
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 Posted: Wed Jan 24, 2007 11:38 am Post subject: 2" or 3" foam |
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Recenly I managed to get 24 or so 1' x 1' wedges of Auralex foam from someone who had more than they needed.
I figured that with another 30 or so, I could make some nice gobos using 3 36" x 80" hollow core doors a la http://www.vo-bb.com/phpBB2/viewtopic.php?t=1604&highlight=iso+booth
Here's the question... am I better off using 2" the whole way through, going 50-50 between 2" and 3" foam, or 1" and 2" as per the example in the thread?
I plan on using these for more than just VO, but I don't think that makes too much of a difference on the foam used (personally I'm leaning towards using a 50/50 with the 2" and 3" wedges... looks like it offers the best approach).
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billelder
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| Posted: Wed Jan 24, 2007 12:27 pm Post subject: |
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| In My Humble Opinion, 2" is the least thickness I'd get. But 1" is better than nothing. <g> |
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Yoda117
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Deirdre
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| Posted: Wed Jan 24, 2007 2:55 pm Post subject: |
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I'm no audio-tech, but the purpose of the foam is to kill sound reflections, yes?
The mix of 3" and 2" makes for a dandy irregular surface.
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Yoda117
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| Posted: Wed Jan 24, 2007 3:58 pm Post subject: |
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| Deirdre wrote: | I'm no audio-tech, but the purpose of the foam is to kill sound reflections, yes?
The mix of 3" and 2" makes for a dandy irregular surface. |
I agree 100%.
The foam can be used for isolation or diffusion.
That said, if the thicker the foam, the better the solution, we'd all be using 4" foam by now, wouldn't we?
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Frank F
Fat, Old, and Sassy
Joined: 10 Nov 2004
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Location: Park City, Utah
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| Posted: Wed Jan 24, 2007 4:00 pm Post subject: |
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| Quote: | | D.B. wrote: "...the purpose of the foam is to kill sound reflections..." |
Actually, the purpose of foam is to "diffuse" reflections, not to kill sound or it's reflections.
**The sound is still "a-live" but is re-directed to other areas where is will dimish without becoming a problem. Some lower frequencies will be trapped in the foam, and dissipate there, but higher frequencies will be sent in a myriad of directions, thereby diminishing or 'diffusing' the offending sounds.
Sound-proofing (i.e.: deaden the extraneous sound) is another subject.
Consider this, if the general room conditons are quiet - and all you need is to take the boominess or reflections (echoes) from the room... then a mix of one and two inch foam is good...
To 'sound-proof' a room, or otherwise protect the mic from unwanted sound, that would require a whole different set of things to go right... and 'foam' is just one very small factor.
Toodles
Frank F
**Edited to be more precise...
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DaveChristi
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Joined: 03 Aug 2006
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| Posted: Wed Jan 24, 2007 4:41 pm Post subject: |
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Maybe it's my ear.... but too many tall wedges (2" and 3") will trap (or deflect) too much of the high-end and leave the audio muddy-sounding. I bought 1" and 2" so I'd be able to trap (or deflect) the excess "life" in the room without getting rid of the highs.
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Yoda117
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| Posted: Wed Jan 24, 2007 8:12 pm Post subject: |
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that's weird... after talking with a rep, they recommended the larger wedges only if I needed some low end diffusion.
I think I'm more confused now than when I began. 
At least the color should be easy... sticking with charcoal all around (too cheap to pay for color, besides the freebies were charcoal as well)
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Frank F
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| Posted: Wed Jan 24, 2007 9:18 pm Post subject: |
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This may help:
http://www.ethanwiner.com/acoustics.html It is a brief overview on acoustic treatments and their applciation.
...at least it will confuse you more.
Toodles
F2
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Yoda117
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bobsouer
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| Posted: Thu Jan 25, 2007 2:36 pm Post subject: |
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| Yoda117 wrote: | | Frank F wrote: |
...at least it will confuse you more.
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Yep, sure did.
I'll need to take some time tomorrow to read this.
EDIT: So what's the general consensus... 1" and 2", 2" only, 2" and 3"? |
Greg,
If forced to make a single recommendation, I'd vote for the 2 and 3 inch combination.
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steveanthony
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Joined: 30 Aug 2006
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Location: Western Massachusetts
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| Posted: Thu Jan 25, 2007 3:03 pm Post subject: |
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Let me throw this out there - if you're investing in acoustic treatment, before buying foam, check into rigid fiberglass. Owens Corning makes a couple varieties call OC 703 and OC 705 in 2 and 3 inch thicknesses. A dozen 2' x 4' panels should run about $100. The downside is that you'll need to make frames and cover them with cloth.
For the lowdown on rigid fiberglass, it's back to Ethan Winers site that Frank mentioned or www.realtraps.com. The stuff absorbs a wide range of frequencies, particularly on the low end.
Also, in the Studio Building and Display section of the Homerecording forum, http://www.homerecording.com/bbs/index.php, there are several threads about building broadband absorbers out of rigid fiberglass, many include how-to photos. |
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Yoda117
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| Posted: Thu Jan 25, 2007 3:39 pm Post subject: |
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For the needs now, foam is the best option... but I will consider fiberglass for future use (I've seen it used to great effect in a few studios I've been in).
Other than that, I just picked up some 3" to go with the 2" foam for a good price (from everybody's favorite, foambymail).
Thanks for the input guys and gals!
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Voiceovers by Gregory Houser
Philadelphia based Voice Actor
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