Has anyone used this with good results? What is the benefit and what are the disadvantages?

 

Polyfill fools the driver into thinking that the enclosure is bigger than it actually is. It does this by slowing down the sound wave inside the enclosure. I've been building speakers for a few years now and I don't hear any difference between stuffed and un-stuffed boxes. It's cheap to buy (you can get it at any fabric store) so go ahead and experiment with some.

 

Thanks for the quick help bro. From your experience how much do you reccommend? I have Kicker XPL 15's and will be installing an Orion 1000 Class D amp.

 

Ok, in my experience the bass note seems to "hold together better" or distort less. It also seems to deepen the response because the air mass is moving slower.

With that being said, the general rule of thumb is 1-1.5 lbs of polyfill per cubic foot of air space inside the enclosure.

 

I was always told to use 1/2 to 1 pound of fill per cubic foot. Leave it fluffy inside the enclosure. Don't pack in down any. And be sure to keep it away from the cone.

 

I have had good experiences with stuffing boxes with polyfill. It seems to give the sub deeper bass and tighter response

 

Fellas did it seem like you llost volume and the deep boom onjce poyfill was added? Sounds much cleaner but I think I lost some volume.

 

I do not feel that it sounds like I lost any volume, but just improved the overall sound of the sub. I am not saying its a night and day difference but I feel the subs hit "cleaner" with polyfill.

 

If you have the fill packed in too tightly you may loose a bit of performance. Having the fill packed tightly will reduce the internal volume of the enclosure.

 

Ployfill does displace some volume in an enclosure, but it slows down the waves more than it displaces the volume hence amking it wound like a larger box. The deeper play that everyone is describing is what a sub will sound like in a larger box.

 

Can you use polyfil in a sealed box or just a ported box?

 

Sealed box is fine.

 

Usually sealed enclosures use fill and vented enclosures use batting on the walls of the enclosure.

 

When I took apart my JL audio Powerwedge box it was filled with poly fill and then a flat piece of batting to protect the sub from the factory. I have used this box for over a year and had no problems, so I reused the polly fill and batting in my millhouse box and I am impressed with the way it sounds.