Have some egg crate foam- how should I use it?

[bchandler 10+ year member]

I managed to take home some egg crate foam used from shipping from my employer. I have probably 10 square feet or so. It is open cell. Are there any real uses for this stuff? I've heard putting a section behind each door speaker could possibly help. My doors are fully deadened, though. If there's no use for it, I'll probably line the lid of my trunk with it for aesthetics, since I have bare Raammat there now (no interior panel on the lid).

Click to read more...

 

[Qbenjamin 10+ year member]

Put it all inside of a bag. Take the bag to the trash. Lift the lid on the trash can. Toss that crap away. Close lid on trash. /story

 

[Lil Poot 5,000+ posts]

there was a slight but noticable difference in midbass response when i put it behind my components up front, door was already deadened. i just put about a 12x12 piece behind each driver so you should have plenty left over.

 

[Lil Poot 5,000+ posts]

Put it all inside of a bag. Take the bag to the trash. Lift the lid on the trash can. Toss that crap away. Close lid on trash. /story

//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 

[MemphisCherokee 10+ year member]

yeah

it doesn't do shit

all itll do is absorb sound if you line a box with it

 

[Lil Poot 5,000+ posts]

yeahit doesn't do shit

all itll do is absorb sound if you line a box with it

absorb sound? i didnt realize sound waves could be absorbed...

 

[bchandler 10+ year member]

I think the theory is that it scatters sound waves so that they cannot reflect as well or cancel each other out...

Well, would the cosmetic panel on the trunk lid idea have any ill effects?

 

[Rudy 10+ year member]

I think the theory is that it scatters sound waves so that they cannot reflect as well or cancel each other out...

Have to waterproof open cell foam to use it in a door.

Well, would the cosmetic panel on the trunk lid idea have any ill effects?

Doesn't sound very attractive or durable, but as long as it doesn't get wet, it shouldn't cause any problems. Some foams intended for shipping don't last very long, they dry out and crumble after a few months.

 

[azbass 5,000+ posts]

line yer headliner with it.. heheheeh

 

[amedeuce 10+ year member]

http://www.caraudio.com/forum/showthread.php?t=95925

Proper sound deadening tutorial on this very forum and it involves using egg crate foam //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[amedeuce 10+ year member]

It's sound absorbant material, designed to deflect the rearwave of the speaker to reduce standing waves and cone breakup. That, or deflex pads, are supposed to make a pretty noticeable difference. While I haven't installed any yet, I've read enough about them from IASCA world champions to trust their opinion that they do infact work //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Plus, for the $20 or whatever, you're not out much if it doesn't //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

from that link

 

[Lil Poot 5,000+ posts]

oh squeak doesnt know what the hell he's talking about.

they absorb sound waves, you want to keep those.

 

[bigbang 10+ year member]

Correct me if I'm wrong, foam, polyfill and the like disperse sound waves and cause them to reflect in on one another, cancelling each other out, but this only works at higher frequencies. At low frequencies the fill moves and it creates a small amount of heat through friction turning sound into heat. In speakers, I believe that an amount of fill will smooth midrange response from the midbass by limiting reflections. Reflections back onto the cone will have been delayed and reduce the acuracy. Filler material wont change the pressure inside an enclosure (besides using up a small amount of volume) so the control over the cone will be maintained. It will make the volume of a subwoofer box seem larger by slowing the soundwaves as they go from side to side.