I bought some of this stuff to put in with my two nvx 10's and the sound was great with my box being custom ported. I took some out of one side and played a deep bass song and right away I knew the sound wasn't right like before and I put it back in the side I took out and it was right again. I never thought putting this polyfil in would make a difference but it really does. I highly recommend this stuff if you have sloppy bass because it will clean it up.

Got the product and put it in my subwoofer box right away. havent tried the subwoofer without it, so i cant say much. good amount of filling for the money though. wish i didnt have to put anything under "Look/Design" and "Durability" because i cant say.

I added this to my wedge box that houses a 10" W6. That in addition to port tuning it REALLY made the sub come alive. People swear I have 2 12's in my trunk....

Great product and it does make a difference with sound. It makes it seem like you have more speakers than you have. And its enough to fill a dual speaker box.

I replaced the blown sub in a Jeep Wrangler TJ arm rest enclosure and left out the packing at first and the base thump was a buzzing drag at the end of each thump with parts of the arm rest vibrating more than I wanted. After I packed it nice and full it deadened the base thump to a nice boom and the buzzing of the arm rest itself is almost gone.

Great price and More than enough polyester for one box that has 2 12's.

Great polyfill, was enough for 1 sealed box and 1 ported box, no downsides, great buy.

Makes bass more clear and deep. Can be bought anywhere and I personally recommend poly-fill in sheets.

Used this in a sealed enclosure and worked great, I highly recommend.

Used this to give my sub a little more love. It absorbs a lot of heat from the voice coils, which makes for a longer lasting more healthier and happier sub. To me can not tell much a difference in sound. Still a good product for 5 bucks.

I recently got these and it is really poofy and seems like its a great buy. Will see how it all turns out.

I have one 12inch sub after filling that up still had enough left for a pillow.

Does what its supposed to do, deepens the bass and gives it more of a full sound. Sounds a lot better.

wow it worked just get it its cheap and will give your subs that low notes

sounds better!

This Polyester Fiber Fill in a Sealed Enclosure works better then before. It doesn't sound so hollow anymore.

Well I used this on 2 10" subs and had some left over. It worked for what I needed it for.