What can I use to reduce internal volume (fiberglass enclosure)

[klassic 10+ year member]

My current box is a bit too big for just about any 10" sub designed for a sealed enclosure (funny 15yrs ago it would have been just right and these .6 cu ft box would have been considered for "solobasic" use only). anyway I cant use much wood because of the shape of the box. It wouldn't be able to fill adequate space. I'm looking for some kind of semi solid or shape forming stuff that will dry solid but doesn't weigh a ton. I need to fill about .5cu ft. I'm sure there must be something in home depo that will work but what?

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[hdave 10+ year member]

just go to home depot and ask them, they will be able to help you out.

im not sure what its called but theres this foamy stuff, its yellow in colour, and it dried to be solid and weighs like nothnig at all.

 

[destruction 10+ year member]

its called "great stuff" used for insulation where pipes come into a house. it comes out thick and foamy but swells when it dries.

 

[klassic 10+ year member]

thanks for the responses!