home insulation in doors?

[SounDrive Pro Seller]

While that may keep the fibers from getting wet as well as floating into the cabin of the car, that still doesn't keep the insulation from deteriorating.
I'm done in this thread. An "acoustical engineer" thinks that a roll of insulation is better than the products designed specific for acoustics. You're free to spend your money how you want, but I'll choose other options.

Due to the lack of a better term, you are a dumbass. Did you not read any of what was posted, because you're so hard headed that you won't accept the fact that you're wrong? Don't answer that; it's a rhetorical question.

And just a side note... Polyfill isn't a product "designed for acoustics." It's for pillows and stuffed animals.

 

[keep_hope_alive Premium Member]

While that may keep the fibers from getting wet as well as floating into the cabin of the car, that still doesn't keep the insulation from deteriorating.
I'm done in this thread. An "acoustical engineer" thinks that a roll of insulation is better than the products designed specific for acoustics. You're free to spend your money how you want, but I'll choose other options.

Here's an experiment that was done by a student at Pitt. Showing the fiberglass is better than polyester, yet still isn't as good as the "egg crate" open foam with 1/2" holes in it. So yes the fiberglass (purchased at radio shack) was better then polyester filling for pillows, but it still doesn't equal the foam that was created specific for the acoustical purpose. http://www.pitt.edu/~szekeres/resonant.txt

thanks for sharing the reason for your understanding. maybe you should read it again.

Concerning a recent project with a 10 inch driver, Qts of about .5, in a boxof about 1/4 the size projected with my program, Q-box. Stuffing the box

pretty well with fiberglass, the thin log strand no-itch type, gave me pretty much a

theoritical maximum of about a 40% box size increase. You can't get this

kind of increase using polyfill.

fiberglass batt is not much different than the "acoustical fiberglass" used in commercial acoustical treatment. as such, yes, fiberglass batt is used in products specifically designed for acoustics. i'm just a savvy guy and I provide a DIY approach using readily available materials. the main difference is density and packaging. higher density fiberglass batt (in pounds per cubic foot, or pcf) will provide better absorption.

when comparing materials, we refer to absorption coefficients. by "we" i mean industry professionals and commercial manufacturers. when comparing absorption coefficients, it's important to understand the mounting of the materials as mounting an absorber against a wall provides lower absorption than holding it off from the wall by an inch or two.

 

[trumpet 5,000+ posts]

While that may keep the fibers from getting wet as well as floating into the cabin of the car, that still doesn't keep the insulation from deteriorating.
I'm done in this thread. An "acoustical engineer" thinks that a roll of insulation is better than the products designed specific for acoustics. You're free to spend your money how you want, but I'll choose other options.

Here's an experiment that was done by a student at Pitt. Showing the fiberglass is better than polyester, yet still isn't as good as the "egg crate" open foam with 1/2" holes in it. So yes the fiberglass (purchased at radio shack) was better then polyester filling for pillows, but it still doesn't equal the foam that was created specific for the acoustical purpose. http://www.pitt.edu/~szekeres/resonant.txt

Pretty ****** paper you linked.

I'm just guessing,the box must be significally smaller than recommended to achieve as much as

the 40% increase in aparent size, but maybe not??

Peer reviewed papers used by professionals do not include guesses.