Does Polyfil really help?


Bronze Member
Username: Strike5858

Post Number: 20
Registered: Mar-07
Ok iv heard that adding polyfil to your box helps deaden it and trick the sub into thinking it has more airspace. This dont make sense to me considering that if you add that stuff to the inside, it will take up airspace.

Also if it does, how to you put it in? adhere it to the inside of the walls of the box or just stuff it in?

Silver Member
Username: •cam•

Post Number: 391
Registered: Nov-06
It slows down the waves is all I'm completely sure about. I'm guessing that makes them take longer to get to the other sides of the box so it makes the sub act like it's in a bigger box but I'm not really sure. I think you can just stuff it in to a sealed enclosure, maybe keeping it a little bit away from the sub, but in a ported enclosure you have to staple it down to stop it from blowing out. You could probably use netting or something to hold it down too.

Gold Member
Username: Nd4spd18

Southeast PA

Post Number: 2818
Registered: Jul-06
It slows down the sound waves and therefore makes the box seem slightly larger than it is. You don't need it if your box is built to your subs specs though, which it should be......

Bronze Member
Username: Slimdog53185

Bowling Green, Kentucky U.S.

Post Number: 33
Registered: May-07
I've used it in some of my boxes. It does make it sound better most of the time. You can always try some and remove it if you don't like it. The specs on my subs say to staple 1" of polyfil to the box walls. Not really sure if I should do that or not though.

Here is a little more info. ces/fiberfill/

Gold Member
Username: Safe_cracker

Chicago, IL US

Post Number: 2912
Registered: Jan-06
It not only slows them but it also breaks up standing waves so the bass will sound cleaner. I personally would use it in a sealed enclosure. Try it without then try it with, will need a lot of it..Polo..

Gold Member
Username: Wingmanalive

A pic is worth 1000 posts!!

Post Number: 6930
Registered: Jun-06
Can also be used in boxes improperly built to correct volume. Poly works. Foam as well. I've used carpet padding with great success. Easily attached and secured with only staples. Cheap too. Stay away from fiberglass insulation. The fibers aren't safe when expelled from the box.

Gold Member
Username: Insearchofbass

Post Number: 5221
Registered: Jun-04
thanks paul always lookin for other alternatives carpet padding nice to know it works
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