View Full Version : stuffing cotton into a sealed box, yes or no?

04-07-2005, 12:40 AM
i know nothing about sub boxes :uhoh: but im trying to learn as much as i can.

i notice some sealed boxes have cotton/fluffy filling, and some sealed boxes dont. is it better to put cotton in there?

04-07-2005, 01:08 AM
Depends...polyfill can help if you have a slightly too-small box, to raise the "apparent" cubic feet the sub "sees".

04-07-2005, 01:12 AM
"Hence" the "quotes".

Polyfill is also used in mass-loaded transmission lines to do exactly that...slow the velocity of the backwave down.

04-07-2005, 12:38 PM
yeah it helped me, i have a 2204 single cab chevy, had to keep the box small so i just used some polyfill to help

04-07-2005, 07:22 PM
When you put the polyfill in a sealed box, can you just put it loosely in the box and don't have to worry about anything?? Also, I'm using a 6 cubic foot net sealed box, how much polyfill should I put in it to trick the sub into performing as if the box was twice as big??

04-07-2005, 07:35 PM
6 Foot Sealed Enclosure Seems Big, How Many Subs Is That?

04-07-2005, 07:53 PM
Depends on the sub...could be one or several.

04-08-2005, 03:45 PM
This current box is ported for the h2 but i'm designing a sealed box for the 4 15" Atlas sub's which will be the exact same size (this box is the biggest I could fit in my car so that's why i'm looking at polyfill to increase size)
-By the way, can you just loosely fill the box w/polyfill or do you need to hold it down somehow?

04-08-2005, 04:39 PM

go to p ost #8. i copied that from the bbp6 manual. maybe it'll help u out a little.

04-08-2005, 05:00 PM
yeah dawg, good look
but when you put the polyfill on the sides of box, what is actually holding it up??

Edit-Also, if the box is sealed, you don't have to worry about pinning it down, do you??

04-08-2005, 05:07 PM
i heard chicken wire is also useful to keep it agains the box walls.

04-10-2005, 08:59 PM
Chicken wire. Best post ever!

04-10-2005, 10:38 PM
he was serious about the chicken wire, unless you want it blowing out the port (i know it's gonna be sealed)

04-11-2005, 03:23 AM
So if you have a sealed box, you do not need anything to hold the polyfill down, correct?

04-11-2005, 03:25 AM
You probably should...just get some construction staples and be done with it.

04-11-2005, 03:31 AM
Well I tried to stuff a box before so it was very well stuffed lets say. I did it loose and there was ALOT in it (sealed box 2 12's) I lost a good amount of low end but it did hit nice and tight. The only problem I found with the loose is when you try to take the subs out :0) It wraps around the screws then you cant get the sub out. Lucky I got enough screws out to get behind the sub and cut it off the screws, if I didnt I Would of been cutting the box. So I would staple it down :0)

Or just duct tape it down :D

04-11-2005, 07:47 AM
The sub doesn't have eyes ... it can't see anything ...