Got done building a box. Will insulator count as displacement?

[jlaudiow6 10+ year member]

I just built a fiberglass box for 2 12 w7. It fits nicely in the car but in order for it to look how i wanted i had to make the box bigger than the recomended specs..

Its a sealed enclosure. Kind of makes a hollow noise some times. Like the box is too big. I have like 2 yards of fleece left over which i think will make a good insulator inside the box.

I was wondering if that the fleece counts as a displacement to make the volume in side the box smaller.

thanks

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[jlaudiow6 10+ year member]

i just placed the fleece in there and the hollow sound is gone but is the fleece strong enough to consider it as a displacement? or do i need to put some blocks of wood in there?

 

[beast644 10+ year member]

the fleece got rid of the hollow sound becauses it acts as dampening, which is necessary in any sealed enclosure. But its not changing the volume of the box, if it sounds good, i wouldnt worry about changing the internal volume, but u can try droping somthin solid in there to see how it sounds (but secure it so i doenst rattle around and dammage ur sub). U might want to try replacing the fiberglass fleece with a material designed for dampening, such as Acoustastuff.

 

[Trixter 10+ year member]

U might want to try replacing the fiberglass fleece with a material designed for dampening, such as Acoustastuff.

Or poly fil. It cheap and at Wal-Mart. Use about 1lb./cu'.