help with speaker box

[hunter57255]

i need help with a speaker box i built one a couple of days ago and i saw on ebay some people put foam in there i was wondering what i should put in mine and what would the foam do to the speaker box

if you have any answer email me at mattpalm@yahoo.com or post a message
Thanks

[dbornotdb]

It's not foam, it is poly-fill. You can pick it up in the fabric/craft section of Wal-Mart. You add it loosely to the inside of the box to slow down the backwave and make the sub act like it is in a bigger enclosure.

But add to much and it will actually take space away so use it sparingly.

[Trixter]

Also, becareful adding too much to your box if it is ported because it could throw off your tuning.