Re: [papercreters] Re: Sound Chamber Recipe Guess -was- Re: papercreters

Acoustics research shows that while egg cartons have a shape that might theoretically provide some acoustic diffusion (ie, reduces echos). They provide almost no sound absorption, and certainly no sound isolation. Therefore, they are almost completely ineffective. So all those musicians stapling up egg cartons as acoustic treatments are laboring under a myth.

Here's a link. This place actually had acoustics tests performed on egg crates.
http://www.acousticsfirst.com/eggc.htm

Bed foam isn't a whole lot better. It'll absorb a little from maybe 1-2kHz up, but not below that. So it will just make your room sound dead, but boomy. Not a pleasant result. Once again, this is as an acoustic treatment, it is almost completely useless as a soundproofing material.

Greg

----- Original Message ----
From: "larystoy@yahoo.com" <larystoy@yahoo.com>
To: papercreters@yahoogroups.com
Sent: Thursday, July 17, 2008 5:12:43 PM
Subject: [papercreters] Re: Sound Chamber Recipe Guess -was- Re: papercreters

I'm not exactly sure, but I remember reading an article a few years back about using egg cartons for sound proofing. It seems the shape of the carton somehow deflects sound. I have seen rooms with panels arranged sticking out from the walls to adsorb sound.   OK, what does this have to do with Papercreate?   Depending on how big an area (room) you want to sound proof, it seems that if you used the egg shell shape and made your Papercreate form in that shape it should work.   Probably want to make the cones about 6" in diameter and 3" or 4" deep. Seems like it could be done without too much of a problem.   Question is how to validate it and could the forms be made that way? I would think you could pour your blocks as you normally would, and just before it sets up, have some sort of coned form that you could just press into the Papercreate to create the indentations with.   Anyone with other ideas? This should open the door for some lively further discussion.   PS:   I have been lurking in the background and reading each article on Papercreate avidly each day, sure is a lot of good and interesting information available when people share their ideas and mistakes.   Problem is I have been busy building a HPV (Human Powered Vehicle) the past few weeks. But one of my projects I want to complete this summer is my 55 gallon Papercreate mixer.   I will be documenting how I make it and posting a page on my website showing all of the details, fun, mistakes and such when I start that project.   For those that would like to see the HPV article the URL is www.websbylarry. com.   Larry Arnold larystoy@yahoo. com

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