Review written by robert from Council Bluffs, IA

as promised white fluffy stuff. exact same poly-fill found at the hobby store.

Review written by alex from Reno Nevada

i have a 1.7 sealed enclosure and put my cvr in here and i thought it wasnt going to give it bass but i couldnt believe it. great buy!. just be careful on over filling your box they recomend only half of the box is filled with it. and cheap for more bass.!

Review written by Aj from Haltom City Texas

truthfully i didnt compare the sound of the bass with or without the polyfill, i just read up on what its supposed to do and it supposed to make the box think its bigger than it really is so im just guessing it works and also for $3.99 it was worth it i only used abouthalf the bag in about a 1 cubic volume box in my single cab dakota so u can do a very large box with this bag it goes a long way and if it does what people say tis well worth it expecially when you have limeted space like i did.

Review written by Matty from Rosedale MD

This product is a good price and does the trick. Dont let the pic fool you because a LOT comes in one pack.

Review written by Paul from Cadillac, MI

It's awesome and helps give a more "full" sound to a smaller sealed box, so if your short on cash and want more sound this is definitely a way to go. But, as someone stated earlier make sure to be careful when placing it in the box and not to "over stuff" so that your subs won't over heat and end up costing you more money.

Review written by JEFF from ITHACA, MI

I bought some, I tried it, it works great; I would recommend this to anyone that wants to use a smaller enclosure than is recommended by the manufacturer for the sub or just improve quality of the sound to reduce the distortion a little bit by adding a little bit, but be careful if you surround the sub to closely it may overheat and burn up, but it really does work I use it all the time

Review written by keenan from lindenhurst, IL

cheapest upgrade u can do to get better sound from your sub, if your box is small and your short on space...

Review written by alan from roseville, MN

I got this for my alpine type r because I had it a sealed and I wanted more boom, for $4 this amazing, the amount you get is bigger than a pillow and it goes a long way, buy it!!!!!

Review written by Lorren from Millerstown, PA

I bought a bag of this stuff and put in 10 inch enclosure. It made a big improvement, It hit harder than before.

Review written by John from Cocoa, FL

i have this in a single 10" enclosure and it hits harder than i thought...this stuff is great

Review written by Bojan from Oakville, ON, Canada

It is helpful for small enclosures but it is not for ported ones. It gives a bit more power and a cleaner bass even in a ported box. It is not a surprising but its worthed if you want cheaper, better sound.

Review written by Kevin from Colorado City, CO

Don't like the sound of a sub in a sealed box?
Don't have a lot of room for a box?
This product gives small boxs with any sub a great sound.
Makes a big difference.

Review written by Jorge from Reno, NV

THIS PRODUCT IS THE CHEAPEST WAY TO ADD POWER TO YOUR SOUND SYSTEM ITS WORKS GREAT IF YOU WANNA ADD SOME EXTRA POWER TO YOUR SUBS POLY FIL IS THE WAY TO GO...

Review written by Matt from Red Oak, TX

Very nice product for getting more bass out of some smaller boxes. I used this in a 1.4cuft enclosure for a kicker sub, and affixed it with super 77 and it stays fine and does help the bass out a little by giving it more time for the air to reach the box. This would also be very useful for making your own home theater speakers and filling the small spaces you have to work with. Just dont overstuff it, and follow the instructions you get.

Review written by Juan from Fresno, CA

ok, this is worth every penny, i bought a bag of this stuff at wal-mart for 4 bucks, expecting nothing out of it, but it definetly makes a different in the small box i have in my single cab s10! it added a much deeper and cleaner bass than before. Worth every penny! It is one of the cheapest ways to improve your bass!

Review written by Michael from Waxhaw, NC

Me and my friends were kidding around on this web site to see what cheap things we could do to make my friends subs hit harder. We find this product and start laughing but we decided it was cheap so it was worth a try. He has oversize subs in these small boxes and we start putting it in and when we turn on the system, THEY HIT HARDER THAN EVER! Worth every penny.

Review written by Jonathan from Nacogdoches, TX

Added 1 bag to each one of my sub boxes for my Audiobahn 12's and 15 SE. This stuff really works makes bass sound clearer and tighted. Greatly improves sound quality. Need ato buy if you own any subs.

Review written by Keith from Atlanta, GA

I had some of this from my previous sub enclosure. At first I installed my new subs without this, but once I put this in the box I got tighter, louder bass. It is definitely worth buying.

Review written by Chris from Sacramento, CA

I have a single DUB 12' sub in my truck and it sounds great. Upon putting a 20 oz bag of Poly Fil in it it instantly made an incredible difference. It sounds stiffer almost like the bass dosn't sounds nearly as distorted. Great difference in sound with a great price. The more fill the better. Start with the little things when trying to improve your system the in-expensive way.