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Polyester Fiber Stuffing

Make your subwoofer think it's in a bigger box (1-pound pack)

Item # 027808

Top seller

Item # 027808

Ships today

In stock
$12.99

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About the Polyester Fiber Stuffing

The sound wave coming off the back of your subwoofer reacts with the air contained in the box. Polyester fiber stuffing slows down sound waves inside the box, making the subwoofer perform as if the box were bigger. Use 1 to 1-1/2 pounds of stuffing per cubic foot of box volume.

What's in the box:

  • 1 pound of Polyester fiber stuffing
MFR #027808

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Polyester Fiber Stuffing reviews

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More details on the Polyester Fiber Stuffing

Mark G.

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Customer Q&A

15 questions already asked

Q
Can I lay this in a box as a sheet form?
[ Mycheal  Jun 11, 2020 ]
2 answers
A
Yes. That will work. Just having the fill in the box will do the job.
[ MICHAEL J  Jun 11, 2020 ]
A
I had enourmous rattling from the Subwoofer in my Jeep. I packed the housing that held the sub and it changed the way the bass hit It was clear crisp and deep. I would give it a shot. Definitely helped take away the plastic sound and made it more like surround!!
[ Michael  Jun 11, 2020 ]
Q
I watched a video on using poly fill in sealed sub box and the guy had a sub torn apart that had poly fill inside the sub. He said that when it builds up inside a sub it will cause premature failure. Just curious if anyone has experienced this or is it a uncommon issue?
[ Cory  Jan 14, 2020 ]
1 answer
A
If you overstuff the box with polyfill it can hurt performance and cause premature issues and even failure, but you should test the sub without polyfill, then loosely place a little in your box and listen. If performance is hurt, you over stuffed.
[ Michael  Jan 28, 2020 ]
Q
do I still need poly fill if I have the speaker covers on the back of speaker ?
[ steve  Jan 04, 2020 ]
2 answers
A
Yes the poly fill can help in many situations. I used it inside factory speaker boxes, my sub box (its small in a jeep) and inside the foam baffles of my dash speakers.
[ Anthony  Jan 05, 2020 ]
A
If you have a cover on the back of the speaker the poly fill will not be effective, so no you don't need it.
[ MICHAEL  Jan 04, 2020 ]
Q
How much of a difference will it make if I use 1 lb of poly in a 1.90 cubic foot ported box tuned @ 32 hz ? will the sub think its in a 2.20 and tuned @ 30 hz?
[ Rick55  Jan 09, 2019 ]
1 answer
A
1 pound of poly fill honestly might not even fit in a 1.9 cubic foot box. It won't make that much of a drastic difference, but it will help a little bit.
[ Andrew  Jun 14, 2020 ]
Q
My new sub requires 1-1.5 cubic airspace and my sealed box is only .90 cubic airspace . The box fits under my 1997 gmc rear seat, can't go bigger. Will this setup work ok?
[ Charles  Dec 31, 2018 ]
3 answers
A
The stuffing does not increase air space. So no this will not make the box bigger from .9 cuft to 1 or 1.5 cuft. This is best to help reverberating sound waves be knocked down, so to speak, helping the clarity of the sound. Your best bet is to find a speaker that fits the available air space (0.9 cuft) condition
[ Hunter  Jan 01, 2019 ]
A
Hi Charles, This is one of those cheap things to just try and see how it works. Poly is used in smaller boxes when the speaker requires more volume.
[ chris  Dec 31, 2018 ]
A
Yes it'll make the sub feel as if it has more airspace
[ Gregory  Dec 31, 2018 ]
Q
My new sub requires 1-1.5 cubic airspace and my sealed box is only .90 cubic airspace . The box fits under my 1997 gmc rear seat, can't go bigger. Will this setup work ok?
[ Charles  Dec 31, 2018 ]
3 answers
A
It worked great and made a world of difference with my 15's
[ Erik  Dec 31, 2018 ]
A
Using the fiber stuffing will make the sub think it is in a larger box, and that should make up for the smaller box dimensions you actually have.
[ MICHAEL  Dec 31, 2018 ]
A
Yes it will. You're not going to pack it super tight. It comes in an almost 1 cubic box. When filling you want a consistency of wimpy pillow. You are essentially creating a denser air space inside the the box which causes the inward speaker excursion to be tighter and then the outward movement is freer causing the bass sound wave to explode. Just be sure it is truly a sealed box and not a ported box. I have even used foam gaskets between the speaker and box. The sealed box gives a more natural bass sound than a ported one which is muffled.
[ Michael  Dec 31, 2018 ]
Q
Any difference between this stuff and the stuff sold for arts and crafts/stuffed animals?
[ David  Mar 26, 2018 ]
3 answers
A
It's the same stuff
[ john  Apr 04, 2018 ]
A
I do believe that it is a denser material but thought the same thing when I saw the similar material in a craft store. This product did work very well though but you may want to play with the amount of material you use in the subwoofer cabinet to get the right sound before you seal it shut. Hope this helps
[ Richard  Apr 04, 2018 ]
A
Wouldn't know cause I've never used the stuff from the craft store.
[ DAN  Apr 04, 2018 ]
Q
What about putting Polly fill in for the back speakers in a Ford ranger? They are 5by7s but are in a very small factory spot behind the seat.
[ Clint  May 22, 2017 ]
3 answers
A
I used the Polly fill behind 5x7 speakers in my motor home and it works great.
[ George  May 23, 2017 ]
A
It certainly wouldn't hurt! Give it a try listen and if you like it, than your done. If not you can always pull the Polly fill back out.
[ Harold  May 23, 2017 ]
A
It won't hurt anything to try it. It's possible you could get better tone out of the low end.
[ SETH  May 23, 2017 ]
Q
I have 2 10 inch sub requiring .56 cubic feet per sub, not having any luck finding a box, can I use the poly to fill the 1 cubic foot box to get it close to .56 cubic feet ?
[ Rich  Mar 28, 2017 ]
3 answers
A
When you add polyfill you are tricking the sub into thinking it's in a larger enclosure by slowing the rear waves . It's not used to make enclosure smaller. Hope this helps
[ jacob  Mar 29, 2017 ]
A
I'm not sure it makes a big box smaller, It makes a small box seem bigger. Please ask one of the techs they should know for sure.
[ Roland  Mar 28, 2017 ]
A
Well that is not technically how it works. Polyfill just makes it seem like that there is more air in a box. In order to accomodate for the necessary amount the sub requires. So the answer is a no. Keep looking for a box or switch to a different pair of subs that closely match a box.
[ Juan  Mar 28, 2017 ]
Q
Is it flammable or at least resistant? I've had a sub burn out before.
[ Kevin  Dec 31, 2016 ]
1 answer
A
The Polyfil is made of Polyester which is not flammable and does not ignite easily. I hope that helps. My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=5
[ Ryan  Jan 06, 2017 ]  Staff
Q
Thinking of putting this in an 8" wedge box with .35 cubic feet. I'll be putting 2 8" RF extreme performance mid-bass speakers in the boxes. Will the stuffing imporove the sound at all or make it louder?
[ Ricky  Nov 25, 2015 ]
3 answers
A
Hi I'm Alan I myself think the stuffing helps make the box not sound hallow or vibrate the box. When you us use the stuffing fluff the stuffing in the box once you have ran the wires to the out side inputs. In general the stuffing makes the bass sound just a bit hard because the subwoofer has back pressure.
[ ROBERT  Nov 26, 2015 ]
A
I've put Poly stuffing in every sealed sub box I've had. Doing so will make your sub perform as if it were in a bigger box. I've found that in sealed applications it produces a harder/punchy/accurate response at the bottom of the frequency range, not necessarily louder. Hope this helps.
[ MICHAEL GREGORY  Nov 26, 2015 ]
A
If you want to use speaker baffling, this is a much better material than fiberglass. Small pieces won't break off that can enter your speaker. That said, adding this material won't make the sound any louder. It typically is used to smooth out the lower frequencies so the music is more natural sounding and less 'boxy or boomy.' Don't stuff the box tight. Use a small amount, pull it to fluff it out, and very loosely fill the enclosure. The effect is more noticeable with larger enclosures with woofers, but even in a smaller box it can make the sound more natural. Hope this helps. Allen
[ Allen  Nov 26, 2015 ]
Q
Hi I have a sealed dual box for two 12" subs. Each chamber is 0.78 and my subs require a minimum of 0.65-1.50 cubic ft. I'm trying to get at least a 1.50 cubic ft per chamber. How much stuffing would I need ?
[ David  Jan 18, 2015 ]
1 answer
A
I forwarded your question to an Advisor and they responded with the following: I'd get 2 packs. You may end up with a little left, but this should be sufficient. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat.
[ Krissy  Jan 21, 2015 ]  Staff
Q
Can you use the polyester fiber stuffing with 2 12" JL Audio subs that are in a big ported box? The stuffing won't start coming out of the ports right?
[ Jimmy  Jan 16, 2015 ]
3 answers
A
It works fine in a ported box.
[ Roland  Mar 28, 2017 ]
A
Unlikely to come out the port. Not sure stuffing works well in a ported box though.
[ BRETT  May 05, 2015 ]
A
If you fill the enclosure with stuffing, it should not move. I should also make sure you fill around the port and not inside of it.
[ NORMAN  Jan 18, 2015 ]
Q
how do I put this in the box? do I just stuff it in or do I need to like staple it down in the box? thanks
[ david  Nov 20, 2014 ]
4 answers
A
Just stuff the correct amount in the box.
[ STEVEN  Dec 03, 2014 ]
A
Just stuff it in
[ JOHN J  Nov 21, 2014 ]
A
Stuff it! What size box are you using? Used it in a compact box with a 12" Kicker.
[ JEREMY  Nov 21, 2014 ]
A
David, Personally, I did my best to increase the thickness of the stuffing by lightly pulling on it from different directions. Once it was fluffed up, I gently put into the enclosure trying to not to pack it down and loosely filling the inside of the enclosure. You want the sound waves from the woofer to be slow down as it passes through the fibers. If the fiber is packed to tight it will act more like a wall and part of the sound wave could be bounced back to the backside of the woofer casing distortion and possible reduce the life of the woofer. If the enclosure will be moving around, you might want to spray the inside of the enclosure with Spray Mount or some other types of spray adhesives. To keep the fibers from shifting around. I hope this helps.
[ NORMAN  Nov 21, 2014 ]
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