Polyfill Questions?

[Fi_all_d_way]

hey guys see if you can help me out here. i got a 2.1 cubic box tuned at 37hz and i want to put polyfill in it. It is recommended 1.5lb per cubic foot for an enclosure under 3 cubic.

So look at this...it is said that it will increase my box size by 30% by slowing down the air and making the sub woofer feel it's in a bigger box.

30% of 2.1 cubic = 0.63 cubic ..so my box will now be 2.1 cubic + 0.63 cubic = 2.73 cubic

SO since my box just change from 2.1 >> 2.73 cubic with the same port...WOULD'NT THIS LOWER MY PORT FREQUENCY????

NOTE: A 2.1 cubic box with a port 30sq in x 24.25 in long = 37hz

and a 2.73 cubic box with the same port area and length = 32.45hz

can you guy put some feedback plz....thanks

[andym85]

i would say yea, ur tuning will probably change some....here is a nice little write up on it...

http://www.soundsolutionsaudio.com/forum/i...?showtopic=7168

[IH8PunkRok]

i may be ignorant but ive never seen anyone use polyfill on a ported box

except in house sub enclosures

[Fi_all_d_way]

i may be ignorant but ive never seen anyone use polyfill on a ported box

except in house sub enclosures

yea bro people do...

[Fi_all_d_way]

i would say yea, ur tuning will probably change some....here is a nice little write up on it...

http://www.soundsolutionsaudio.com/forum/i...?showtopic=7168

thanks alot bro

[bassboombottom]

I put some of the fill in my old obcon box, and it sounded like it was..wel i cant reeally describe it.. it just didnt sound good. I know they use that stuff in bookshelf speakers to "add volume" to the box..

i had some old Sanyo speakers and the fill looked like a cross between fiberglass, the stuff for under your homes carpet, and asbestos

[dr.db]

When used the right way...it works well!!!

[IH8PunkRok]

yea bro people do...

then i am ignorant

[aznboi3644]

polyfill in ported boxes suck...its hard to figure out the real change but a simple solution is a better enclosure.

30% is just general percentage.