1. ## Box size help

When making a fiberglass sub box, how would I get the airspace right? Like whats the right math to use?

2. ## Re: Box size help

Originally Posted by BlueChrome
When making a fiberglass sub box, how would I get the airspace right? Like whats the right math to use?
There is no formula for figuring out an unubtanable solution.

But you can fill the mold with a solid substance and measure it. Dump a pound of sand in there and go from there...

Edit - If you need to know how big to make it before hand just rough estimate the dimmensions. And work from there.

3. ## Re: Box size help

Originally Posted by tRiGgEr
There is no formula for figuring out an unubtanable solution.

But you can fill the mold with a solid substance and measure it. Dump a pound of sand in there and go from there...

Edit - If you need to know how big to make it before hand just rough estimate the dimmensions. And work from there.
Thanks, that helps more than you know it haha

4. ## Re: Box size help

fill it with water and measure the liters

5. ## Re: Box size help

Now if it comes out under or over the airspace specs, am I SOL, or is there a way to correct it?

6. ## Re: Box size help

packing peanuts may be easier than sand.

7. ## Re: Box size help

Originally Posted by BlueChrome
Now if it comes out under or over the airspace specs, am I SOL, or is there a way to correct it?
Adding a solid item, say 2x4 wood or left over MDF laying around will decrease the internal volume.

For a box to small, adding some polyfill will help.

8. ## Re: Box size help

Originally Posted by tRiGgEr
Adding a solid item, say 2x4 wood or left over MDF laying around will decrease the internal volume.

For a box to small, adding some polyfill will help.
Thanks again

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