Author Topic: i need help!  (Read 4058 times)

peace_out54

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i need help!
« on: April 30, 2006, 03:49:04 PM »
I am building a sound proof box for my phyics project. I made a 1ft cube box. I used plywood as the structure, the styrofoam and the noise barrier but it doesn't work. I have already built it but need help to make it actually soundproof. please help!

johnbergstromslc

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Re: i need help!
« Reply #1 on: May 01, 2006, 04:02:44 AM »
Really no such thing as a 'soundproof' anything.  A box with a foot of concrete on every side will only give you 64 dB of attenuation.  4 feet of concrete: 76 dB.  4 feet of lead will get 110 dB, but a really loud sound (cannon fire, rocket, jet engine) will be heard inside.  

The reasons why your box didn't work:

The plywood is, in some ways, the opposite of a good soundproofing material.  Lead is good because it's dense and limp.  Plywood (or most wood) is light and relatively stiff.  

The styrofoam you're using is a closed cell material and doesn't absorb sound well.  Fiberglass, cellulose or cotton insulation will do much better.  

Switch the insulation to fiberglass or cellulose and apply layers of drywall on top of the plywood.  Seal up all the edges - pretend you're building a watertight box.  

skip

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http://www.soundproofing.org/salesRe: i need help!
« Reply #2 on: August 26, 2006, 05:21:41 PM »

Many individuals have had good results using Closed Cell Accoustic Foam in 3/4", 1" , or 2" thicknesses as a liner within the box area.

Take a look at:/http://www.soundproofing.org/sales/prices.html

 

anything